{"title":"Green Roof Drainage \u0026 Water Storage","description":null,"products":[{"product_id":"25mm-storage-drainage-membrane","title":"UGR 25mm Storage \u0026 Drainage Membrane","description":"\u003ch6\u003eDescription\u003c\/h6\u003e\n\u003ch3\u003eHigh-capacity water management for green roofs\u003c\/h3\u003e\n\u003cp\u003eUGR 25mm Storage \u0026amp; Drainage Membrane combines water storage, drainage and filtration within one practical layer.\u003c\/p\u003e\n\u003cp\u003eManufactured from recycled high-density polyethylene, the membrane has 25mm-deep cavities that store approximately 11 litres of rainwater per square metre. This retained moisture helps support healthy green roof vegetation between periods of rainfall.\u003c\/p\u003e\n\u003cp\u003eThe membrane is also perforated, allowing excess water to drain into the space beneath rather than saturating the growing medium and plant roots.\u003c\/p\u003e\n\u003ch3\u003eIntegrated geotextile filter layer\u003c\/h3\u003e\n\u003cp\u003eEach roll has a high-quality polypropylene geotextile permanently bonded to its upper surface. This layer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePrevents soil fines and growing medium from obstructing the cavities\u003c\/li\u003e\n\u003cli\u003eHelps stop the geotextile slipping during installation\u003c\/li\u003e\n\u003cli\u003ePrevents the fabric compressing into the storage cups\u003c\/li\u003e\n\u003cli\u003eRemoves the need to install a separate loose filter layer\u003c\/li\u003e\n\u003cli\u003eSaves time when constructing the roof build-up\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUGR 25mm Storage \u0026amp; Drainage Membrane therefore performs three essential functions within one product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage:\u003c\/strong\u003e retains approximately 11l\/m² of water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrainage:\u003c\/strong\u003e allows excess water to pass through the perforations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFiltration:\u003c\/strong\u003e protects the drainage cavities against soil obstruction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 25mm cavity provides greater water-storage capacity than the UGR 20mm Storage \u0026amp; Drainage Membrane, while retaining the same approximate compressive strength of 150kN\/m².\u003c\/p\u003e\n\u003ch3\u003eSuitable applications\u003c\/h3\u003e\n\u003cp\u003eUGR 25mm Storage \u0026amp; Drainage Membrane can be used within:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExtensive green roof systems\u003c\/li\u003e\n\u003cli\u003eIntensive green roof systems\u003c\/li\u003e\n\u003cli\u003eFlat roofs\u003c\/li\u003e\n\u003cli\u003ePitched roofs\u003c\/li\u003e\n\u003cli\u003eInverted warm roof applications\u003c\/li\u003e\n\u003cli\u003eDomestic roofs and extensions\u003c\/li\u003e\n\u003cli\u003eGarages, sheds and garden buildings\u003c\/li\u003e\n\u003cli\u003eCommercial green roofs\u003c\/li\u003e\n\u003cli\u003eOther suitable walkable landscaping surfaces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor walkable or drivable finishes, the bonded geotextile must be removed, the studs must be filled and the appropriate bedding or sub-base layers must be installed as part of the specified system.\u003c\/p\u003e\n\u003ch3\u003eAvailable sizes\u003c\/h3\u003e\n\u003cp\u003eChoose from two roll widths:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1m x 10m: covers 10m²\u003c\/li\u003e\n\u003cli\u003e2m x 10m: covers 20m²\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBoth versions include an additional 100mm geotextile overlap along the roll width. The 1m-wide roll may be easier to handle and position on smaller roofs or where site access is restricted. The 2m-wide version covers a larger area with fewer adjoining sections.\u003c\/p\u003e\n\u003ch3\u003eDurable and long-lasting\u003c\/h3\u003e\n\u003cp\u003eUGR 25mm Storage \u0026amp; Drainage Membrane is an inert, chemically resistant membrane designed for long-term use within the green roof build-up. It is:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eManufactured from recycled HDPE\u003c\/li\u003e\n\u003cli\u003eResistant to water and alkalis\u003c\/li\u003e\n\u003cli\u003eResistant to saline solutions and organic acids\u003c\/li\u003e\n\u003cli\u003eUnaffected by minerals\u003c\/li\u003e\n\u003cli\u003eResistant to bacteria, fungi and other small organisms\u003c\/li\u003e\n\u003cli\u003eSuitable for temperatures from -30°C to +80°C\u003c\/li\u003e\n\u003cli\u003eGuaranteed against deterioration for 30 years\u003c\/li\u003e\n\u003cli\u003eTested and CE marked to the relevant standard\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts life expectancy is stated as equal to the design life of the structure under DIN 9001:2000.\u003c\/p\u003e\n\u003ch3\u003eWhere UGR 25mm Membrane fits in the system\u003c\/h3\u003e\n\u003cp\u003eA typical green roof build-up may include:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eStructural roof deck\u003c\/li\u003e\n\u003cli\u003ePrimary waterproofing layer\u003c\/li\u003e\n\u003cli\u003eRoot barrier, where required\u003c\/li\u003e\n\u003cli\u003eProtection fleece, where required\u003c\/li\u003e\n\u003cli\u003eUGR 25mm Storage \u0026amp; Drainage Membrane\u003c\/li\u003e\n\u003cli\u003eBonded geotextile filter layer\u003c\/li\u003e\n\u003cli\u003eGreen roof substrate\u003c\/li\u003e\n\u003cli\u003eVegetation\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eFor dedicated root protection, install the \u003ca href=\"\/products\/green-roof-root-barrier\"\u003eUGR Green Roof Root Barrier\u003c\/a\u003e beneath the drainage membrane. Where additional protection against light mechanical damage is required, use the \u003ca href=\"\/products\/green-roof-protection-fleece-300\"\u003eUGR Green Roof Protection Fleece 300\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstalling UGR 25mm Membrane\u003c\/h3\u003e\n\u003cp\u003eThe application surface should have a gradient of at least 2%. Complete the primary waterproofing and install any specified root barrier or protection fleece before laying UGR 25mm Storage \u0026amp; Drainage Membrane.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eRoll the membrane out over the prepared surface with the bonded geotextile facing upwards.\u003c\/li\u003e\n\u003cli\u003eCut it to the required length, taking care not to damage the waterproofing or other underlying layers.\u003c\/li\u003e\n\u003cli\u003eOverlap each adjoining roll by approximately 100mm.\u003c\/li\u003e\n\u003cli\u003eLift the geotextile overlap and lay it over the next section of membrane.\u003c\/li\u003e\n\u003cli\u003eWhere additional joint protection is required, seal the connection with a compatible jointing tape or sealant.\u003c\/li\u003e\n\u003cli\u003eAt vertical edges, raise the drainage membrane by at least 150mm or to the upper edge of the finished substrate layer.\u003c\/li\u003e\n\u003cli\u003eOnce installed, the membrane can immediately receive the specified extensive or intensive green roof substrate.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eFor smaller projects or restricted working areas, the 1m-wide version may be easier for one person to position.\u003c\/p\u003e\n\u003ch3\u003eStorage and handling\u003c\/h3\u003e\n\u003cp\u003eStore rolls upright in dry conditions between 5°C and 25°C. Do not expose the product to freezing conditions or direct sunlight, and protect it from UV before installation.\u003c\/p\u003e\n\u003ch3\u003eImportant suitability note\u003c\/h3\u003e\n\u003cp\u003eUGR 25mm Storage \u0026amp; Drainage Membrane is a drainage and water-storage layer, not a primary waterproofing membrane. It must be installed above a suitable waterproofing system and, where required, the \u003ca href=\"\/products\/green-roof-root-barrier\"\u003eUGR Green Roof Root Barrier\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch6\u003eSpecifications\u003c\/h6\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Material\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Recycled HDPE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Membrane weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 900g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Geotextile\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Polypropylene, approx. 100g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Total weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 1,000g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Stud height\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Number of studs\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 400\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Colour\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Roll length\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 10m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Roll widths\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 1m or 2m (+100mm geotextile overlap)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Coverage\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 10m² or 20m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Roll weights\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 10kg or 20kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Water-storage capacity\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 11l\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Water-drainage capacity\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 9.8l\/(s·m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Compressive strength\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 150kN\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Temperature resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e -30°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Fire resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Class E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Accreditation\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Tested and CE marked\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch6\u003eFAQs\u003c\/h6\u003e\n\u003ch4\u003eHow much water can UGR 25mm Membrane store?\u003c\/h4\u003e\n\u003cp\u003eIts 25mm cavities store approximately 11 litres per square metre; perforations allow excess water to drain beneath.\u003c\/p\u003e\n\u003ch4\u003eDoes the membrane include a filter layer?\u003c\/h4\u003e\n\u003cp\u003eYes. Both roll sizes have a polypropylene geotextile bonded to the upper surface.\u003c\/p\u003e\n\u003ch4\u003eWhich roll size should I choose?\u003c\/h4\u003e\n\u003cp\u003e1m x 10m (10m²) is easier to handle on smaller roofs; 2m x 10m (20m²) reduces joins on larger roofs.\u003c\/p\u003e\n\u003ch4\u003eWhich way up should UGR 25mm Membrane be installed?\u003c\/h4\u003e\n\u003cp\u003eBonded geotextile facing upwards towards the substrate.\u003c\/p\u003e\n\u003ch6\u003eHelp\u003c\/h6\u003e\n\u003ch3\u003eNeed help comparing the drainage membranes?\u003c\/h3\u003e\n\u003cp\u003eNot sure whether the 25mm membrane’s 11l\/m² storage capacity is right for your planting, or whether a lower- or higher-capacity membrane would better suit the roof? Our in-house technical team can provide free advice on product selection, roof build-up and compatible supporting layers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEmail:\u003c\/strong\u003e \u003ca href=\"mailto:info@urbangreenroofs.com\" title=\"mailto:info@urbangreenroofs.com\"\u003einfo@urbangreenroofs.com\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelephone:\u003c\/strong\u003e \u003ca href=\"tel:+44%20117%20370%204018\" title=\"tel:+44 117 370 4018\"\u003e+44 117 370 4018\u003c\/a\u003e\u003c\/p\u003e","brand":"Urban Green Roofs","offers":[{"title":"1m x 10m (10m²)","offer_id":54207509365079,"sku":"UGR25SDM10","price":130.5,"currency_code":"GBP","in_stock":false},{"title":"2m x 10m (20m²)","offer_id":54207509397847,"sku":"UGR25SDM20","price":232.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/0150\/9207\/files\/PermaSEAL_PRO_25P_Main_Image_1000_x_1000.jpg?v=1788432467"},{"product_id":"40mm-storage-drainage-board-1m-x-2m","title":"UGR 40mm Storage \u0026 Drainage Board 1m x 2m","description":"\u003ch6\u003eDescription\u003c\/h6\u003e\n\u003ch3\u003eHigh-capacity drainage and water storage\u003c\/h3\u003e\n\u003cp\u003eUGR 40mm Storage \u0026amp; Drainage Board is a heavy-duty water-management layer designed primarily for intensive green roofs and hard landscaping applications.\u003c\/p\u003e\n\u003cp\u003eIts deep 40mm cavities retain around 15 litres of water per square metre, helping maintain moisture around the growing substrate and vegetation between periods of rainfall. Perforations within the membrane allow excess water to drain away, reducing the risk of the planting layers becoming saturated.\u003c\/p\u003e\n\u003cp\u003eThe combination of high water storage and strong drainage performance makes UGR 40mm Storage \u0026amp; Drainage Boards particularly useful for heavily planted roofs, long drainage runs and roofs with a low gradient.\u003c\/p\u003e\n\u003ch3\u003eBuilt for intensive planting and heavier loads\u003c\/h3\u003e\n\u003cp\u003eManufactured from 100% recycled high-density polyethylene, UGR 40mm Storage \u0026amp; Drainage Board has an approximate compressive strength of 200kN\/m² — equivalent to around 20 tonnes per square metre. This makes it suitable for a wide variety of soft and hard landscaping applications, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIntensive green roofs\u003c\/li\u003e\n\u003cli\u003eRoof gardens\u003c\/li\u003e\n\u003cli\u003eWildflower, plug and seed planting\u003c\/li\u003e\n\u003cli\u003eGrass, shrubs and medium-sized planting\u003c\/li\u003e\n\u003cli\u003eCommercial and residential roofs\u003c\/li\u003e\n\u003cli\u003eInverted warm roofs and cold roofs\u003c\/li\u003e\n\u003cli\u003eBalconies and terraces\u003c\/li\u003e\n\u003cli\u003eLandscaped areas above underground car parks\u003c\/li\u003e\n\u003cli\u003eGround-level landscaping above basement accommodation\u003c\/li\u003e\n\u003cli\u003eWalkable decks\u003c\/li\u003e\n\u003cli\u003eDrivable decks\u003c\/li\u003e\n\u003cli\u003ePaving and slab build-ups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts drainage capacity also allows it to accommodate large drainage lengths or low roof slopes within a correctly designed system.\u003c\/p\u003e\n\u003ch3\u003eWater storage for demanding planting schemes\u003c\/h3\u003e\n\u003cp\u003eIntensive green roofs generally use deeper growing substrates and support larger, more varied vegetation than lightweight extensive systems. UGR 40mm Storage \u0026amp; Drainage Boards help manage water within these deeper build-ups by:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRetaining useful rainfall within its 40mm cavities\u003c\/li\u003e\n\u003cli\u003eAllowing excess water to pass into the drainage space\u003c\/li\u003e\n\u003cli\u003eSupporting heavily planted areas during drier periods\u003c\/li\u003e\n\u003cli\u003eProviding approximately 3.78l\/(s·m) drainage capacity at a hydraulic gradient of 0.10\u003c\/li\u003e\n\u003cli\u003eWithstanding substantial loads from substrate, planting and compatible hard landscaping\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA separate geotextile filter layer is required above UGR 40mm Boards when they are used beneath planting substrate. This stops soil and fine particles from entering and obstructing the storage cavities. Use the \u003ca href=\"\/products\/120g-green-roof-filter-layer-1-5m-x-100m\"\u003eUGR 120g Green Roof Filter Layer\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWhere UGR 40mm Storage \u0026amp; Drainage Boards fit in the system\u003c\/h3\u003e\n\u003cp\u003eA typical intensive green roof build-up may include:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eStructural roof deck\u003c\/li\u003e\n\u003cli\u003ePrimary waterproofing layer\u003c\/li\u003e\n\u003cli\u003eRoot barrier\u003c\/li\u003e\n\u003cli\u003eProtection fleece\u003c\/li\u003e\n\u003cli\u003eUGR 40mm Storage \u0026amp; Drainage Board 1m x 2m\u003c\/li\u003e\n\u003cli\u003eSeparate geotextile filter layer\u003c\/li\u003e\n\u003cli\u003eIntensive green roof substrate\u003c\/li\u003e\n\u003cli\u003ePlanting or turf\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eFor dedicated root protection, install the \u003ca href=\"\/products\/green-roof-root-barrier\"\u003eUGR Green Roof Root Barrier\u003c\/a\u003e beneath the drainage membrane. A protection fleece may also be required to reduce the risk of light mechanical damage to the waterproofing and root barrier — see the \u003ca href=\"\/products\/green-roof-protection-fleece-300\"\u003eUGR Green Roof Protection Fleece 300\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstalling UGR 40mm Boards\u003c\/h3\u003e\n\u003cp\u003eThe application surface should have a gradient of at least 2%. Complete the horizontal waterproofing, root barrier and any other specified underlying layers before installing the slabs.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eLay the 1m x 2m slabs horizontally with the cavity openings facing upwards.\u003c\/li\u003e\n\u003cli\u003ePosition adjoining slabs edge to edge using butt joints; overlapping is not normally required.\u003c\/li\u003e\n\u003cli\u003eCut slabs to fit using a suitable knife, taking care not to damage the waterproofing or other layers beneath.\u003c\/li\u003e\n\u003cli\u003eWhere additional protection is required at a joint, a compatible single-sided membrane tape may be applied over the connection.\u003c\/li\u003e\n\u003cli\u003eFor planted areas, install UGR 120g Green Roof Filter Layer over the completed surface.\u003c\/li\u003e\n\u003cli\u003eApply the specified intensive green roof substrate over the filter layer.\u003c\/li\u003e\n\u003cli\u003eComplete the system with the selected vegetation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThe manageable slab size allows individual sections to be positioned and cut without handling a large roll.\u003c\/p\u003e\n\u003ch3\u003eWalkable and drivable applications\u003c\/h3\u003e\n\u003cp\u003eFor walkable areas without vegetation, a geotextile filter layer is not used. The specified base and bedding materials are instead applied directly onto the membrane and into the cavities before the paving or slabs are installed.\u003c\/p\u003e\n\u003cp\u003eDrivable applications require a suitable sub-base and bedding course between UGR 40mm Storage \u0026amp; Drainage Board and the finished pavement. The complete build-up, loading and drainage design must be appropriately specified for the intended use.\u003c\/p\u003e\n\u003ch3\u003eDurable and long-lasting\u003c\/h3\u003e\n\u003cp\u003eUGR 40mm Storage \u0026amp; Drainage Board is:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMade from 100% recycled HDPE\u003c\/li\u003e\n\u003cli\u003eHighly resistant to water\u003c\/li\u003e\n\u003cli\u003eResistant to alkalis and saline solutions\u003c\/li\u003e\n\u003cli\u003eResistant to organic acids\u003c\/li\u003e\n\u003cli\u003eResistant to bacteria, fungi and other small organisms\u003c\/li\u003e\n\u003cli\u003eUnaffected by minerals\u003c\/li\u003e\n\u003cli\u003eSuitable for temperatures between -30°C and +80°C\u003c\/li\u003e\n\u003cli\u003eGuaranteed against deterioration for 30 years\u003c\/li\u003e\n\u003cli\u003eTested and CE marked to the relevant standard\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts stated life expectancy is equal to that of the structure under DIN 9001:2000.\u003c\/p\u003e\n\u003ch3\u003eImportant suitability note\u003c\/h3\u003e\n\u003cp\u003eUGR 40mm Storage \u0026amp; Drainage Board is a deep, heavy-duty drainage layer intended mainly for intensive planting and compatible hard landscaping. For a lighter extensive green roof that does not require this level of water storage or load resistance, consider the \u003ca href=\"\/products\/20mm-storage-drainage-membrane-2m-x-10m\"\u003eUGR 20mm Storage \u0026amp; Drainage Membrane 2m x 10m\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eUGR 40mm Board is not a primary waterproofing membrane and must be installed above a suitable waterproofing system.\u003c\/p\u003e\n\u003ch6\u003eSpecifications\u003c\/h6\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eMaterial\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e100% recycled HDPE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eMembrane weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eApprox. 2,200g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eStud height\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eApprox. 40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eNumber of studs\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e164\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eColour\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eSlab dimensions\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e1m x 2m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eCoverage\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e2m² per slab\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eCompressive strength\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eApprox. 200kN\/m² (~20 tonnes\/m²)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eWater-storage capacity\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eApprox. 15l\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eWater-drainage capacity (i=0.10)\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eApprox. 3.78l\/(s·m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eTemperature resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e-30°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eFire resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eClass E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eAccreditation\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eTested and CE marked\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch6\u003eFAQs\u003c\/h6\u003e\n\u003ch4\u003eHow much water do UGR 40mm Storage \u0026amp; Drainage Boards store?\u003c\/h4\u003e\n\u003cp\u003eIts 40mm cavities store approximately 15 litres per square metre.\u003c\/p\u003e\n\u003ch4\u003eDo UGR 40mm Boards include a filter layer?\u003c\/h4\u003e\n\u003cp\u003eNo. A separate geotextile filter layer is required above it when installed beneath substrate — use Filter Layer 120.\u003c\/p\u003e\n\u003ch4\u003eHow are the slabs joined?\u003c\/h4\u003e\n\u003cp\u003eSimple butt joints, edges alongside each other; overtape may be applied where extra joint protection is required.\u003c\/p\u003e\n\u003ch4\u003eCan UGR 40mm Boards be installed beneath paving?\u003c\/h4\u003e\n\u003cp\u003eYes, in compatible walkable and drivable build-ups. The cups must be filled and correct bedding or sub-base installed for the loading.\u003c\/p\u003e\n\u003ch6\u003eHelp\u003c\/h6\u003e\n\u003ch3\u003eFree advice for intensive green roof projects\u003c\/h3\u003e\n\u003cp\u003eChoosing the correct drainage layer is particularly important when planning deeper substrates, heavier planting or paved areas. Our in-house technical team can provide free, practical advice on whether UGR 40mm Storage \u0026amp; Drainage Boards are suitable and which root barrier, protection and filter layers your build-up may require.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEmail:\u003c\/strong\u003e \u003ca href=\"mailto:info@urbangreenroofs.com\" title=\"mailto:info@urbangreenroofs.com\"\u003einfo@urbangreenroofs.com\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelephone:\u003c\/strong\u003e \u003ca href=\"tel:+44%20117%20370%204018\" title=\"tel:+44 117 370 4018\"\u003e+44 117 370 4018\u003c\/a\u003e\u003c\/p\u003e","brand":"Urban Green Roofs","offers":[{"title":"Default Title","offer_id":54207509791063,"sku":"UGR40SDB2","price":38.25,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/0150\/9207\/files\/UGR_40mm_Storage_Drainage_Board_5.jpg?v=1788434444"},{"product_id":"60mm-storage-drainage-board-1m-x-2m","title":"UGR 60mm Storage \u0026 Drainage Board 1m x 2m","description":"\u003ch6\u003eDescription\u003c\/h6\u003e\n\u003ch3\u003eMaximum water storage for intensive green roofs\u003c\/h3\u003e\n\u003cp\u003eUGR 60mm Storage \u0026amp; Drainage Board 1m x 2m is a high-capacity water-management layer for demanding intensive green roof and hard landscaping projects.\u003c\/p\u003e\n\u003cp\u003eIts deep 60mm cavities store approximately 20 litres of water per square metre, helping maintain moisture around deeper growing substrates and heavily planted areas between periods of rainfall.\u003c\/p\u003e\n\u003cp\u003eThe membrane is also perforated, allowing excess water to pass into the drainage space below. This balances useful water retention with effective drainage, helping prevent the substrate and plant roots from becoming saturated.\u003c\/p\u003e\n\u003ch3\u003eDesigned for larger planting and complex landscaping\u003c\/h3\u003e\n\u003cp\u003eUGR 60mm Storage \u0026amp; Drainage Boards are specifically designed for intensive green roofs supporting larger shrubs and trees. Its substantial storage capacity also makes it suitable for areas intended to remain without irrigation for extended periods. Typical applications include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIntensive green roofs with large shrubs or trees\u003c\/li\u003e\n\u003cli\u003eHeavily planted commercial roof gardens\u003c\/li\u003e\n\u003cli\u003eResidential and commercial roofs\u003c\/li\u003e\n\u003cli\u003eChildren's playgrounds and recreational spaces\u003c\/li\u003e\n\u003cli\u003eBalconies and terraces\u003c\/li\u003e\n\u003cli\u003eInverted roofs\u003c\/li\u003e\n\u003cli\u003eLandscaped areas above underground car parks\u003c\/li\u003e\n\u003cli\u003eGround-level landscaping above basement accommodation\u003c\/li\u003e\n\u003cli\u003eWalkable decks\u003c\/li\u003e\n\u003cli\u003eDrivable decks\u003c\/li\u003e\n\u003cli\u003ePaving and slab build-ups\u003c\/li\u003e\n\u003cli\u003eOther hard landscaping designs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe membrane's high drainage capacity makes it suitable for long drainage runs and low roof slopes within a correctly specified system.\u003c\/p\u003e\n\u003ch3\u003eStrong enough for demanding build-ups\u003c\/h3\u003e\n\u003cp\u003eManufactured from 100% recycled high-density polyethylene, UGR 60mm Storage \u0026amp; Drainage Boards have an approximate compressive strength of 200kN\/m² — equivalent to around 20 tonnes per square metre. This provides the strength needed to support suitable intensive planting and compatible trafficked or paved areas.\u003c\/p\u003e\n\u003cp\u003eUGR 60mm Boards are:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExtremely tough and durable\u003c\/li\u003e\n\u003cli\u003eResistant to water\u003c\/li\u003e\n\u003cli\u003eResistant to alkalis and saline solutions\u003c\/li\u003e\n\u003cli\u003eResistant to organic acids\u003c\/li\u003e\n\u003cli\u003eResistant to bacteria and fungi\u003c\/li\u003e\n\u003cli\u003eUnaffected by minerals\u003c\/li\u003e\n\u003cli\u003eSuitable for temperatures from -30°C to +80°C\u003c\/li\u003e\n\u003cli\u003eGuaranteed against deterioration for 30 years\u003c\/li\u003e\n\u003cli\u003eTested and CE marked to the relevant standard\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManaging water within an intensive green roof\u003c\/h3\u003e\n\u003cp\u003eUGR 60mm Storage \u0026amp; Drainage Boards perform two essential functions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater storage:\u003c\/strong\u003e Its 60mm cavities retain approximately 20l\/m² to support intensive planting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrainage:\u003c\/strong\u003e Perforations allow excess rainfall to pass into the drainage space beneath.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhen the membrane is used beneath planting substrate, a separate geotextile filter layer must be installed above it. This prevents soil and fine particles from entering and obstructing the storage cavities. Use the \u003ca href=\"\/products\/120g-green-roof-filter-layer-1-5m-x-100m\"\u003eUGR 120g Green Roof Filter Layer 1.5m x 100m\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWhere UGR 60mm Storage \u0026amp; Drainage Boards fit in the system\u003c\/h3\u003e\n\u003cp\u003eA typical intensive green roof build-up may include:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eStructural roof deck\u003c\/li\u003e\n\u003cli\u003ePrimary waterproofing layer\u003c\/li\u003e\n\u003cli\u003eRoot barrier\u003c\/li\u003e\n\u003cli\u003eProtection fleece\u003c\/li\u003e\n\u003cli\u003eUGR 60mm Storage \u0026amp; Drainage Boards\u003c\/li\u003e\n\u003cli\u003eSeparate geotextile filter layer\u003c\/li\u003e\n\u003cli\u003eIntensive green roof substrate\u003c\/li\u003e\n\u003cli\u003eShrubs, trees or other planting\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eFor dedicated root protection, install the \u003ca href=\"\/products\/green-roof-root-barrier\"\u003eUGR Green Roof Root Barrier\u003c\/a\u003e beneath the drainage membrane. A protection fleece may also be required to help protect the waterproofing and root barrier against light mechanical damage — see the \u003ca href=\"\/products\/green-roof-protection-fleece-300\"\u003eUGR Green Roof Protection Fleece 300\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstalling UGR 60mm Boards\u003c\/h3\u003e\n\u003cp\u003eThe application surface should have a gradient of at least 2%. Complete the horizontal waterproofing, root barrier and any other specified underlying layers before positioning the membrane.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eLay the 1m x 2m slabs horizontally with the cavity openings facing upwards.\u003c\/li\u003e\n\u003cli\u003ePosition adjoining slabs edge to edge using simple butt joints.\u003c\/li\u003e\n\u003cli\u003eOverlapping is not normally required, although it can be used where necessary.\u003c\/li\u003e\n\u003cli\u003eCut slabs to the required shape with a suitable knife, taking care not to damage the waterproofing or other underlying layers.\u003c\/li\u003e\n\u003cli\u003eFor planted applications, install UGR 120g Green Roof Filter Layer across the completed surface.\u003c\/li\u003e\n\u003cli\u003eApply the specified intensive green roof substrate above the filter layer.\u003c\/li\u003e\n\u003cli\u003eComplete the system with the chosen planting.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThe manageable slab format allows individual sections to be positioned and cut without handling a large roll.\u003c\/p\u003e\n\u003ch3\u003eWalkable and drivable applications\u003c\/h3\u003e\n\u003cp\u003eFor walkable areas without vegetation, a geotextile filter layer is not required. The specified base and bedding materials are applied directly onto the membrane and into its cavities before paving or slabs are installed.\u003c\/p\u003e\n\u003cp\u003eDrivable applications require a suitable sub-base and bedding course between UGR 60mm Storage \u0026amp; Drainage Boards and the finished pavement. The complete build-up, drainage and structural loading must be designed for the intended traffic and use.\u003c\/p\u003e\n\u003ch3\u003eImportant suitability note\u003c\/h3\u003e\n\u003cp\u003eUGR 60mm Boards are intended for high-capacity intensive planting and demanding landscaping projects. Where the roof does not require 20l\/m² of water storage or support large shrubs and trees, the shallower \u003ca href=\"\/products\/40mm-storage-drainage-board-1m-x-2m\"\u003eUGR 40mm Storage \u0026amp; Drainage Board 1m x 2m\u003c\/a\u003e may provide a more appropriate solution.\u003c\/p\u003e\n\u003cp\u003eUGR 60mm Storage \u0026amp; Drainage Boards are not a primary waterproofing system and must be installed above a suitable waterproofing system.\u003c\/p\u003e\n\u003ch6\u003eSpecifications\u003c\/h6\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Material\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 100% recycled HDPE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Stud height\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Membrane weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 2,500g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Number of studs\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 130\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Colour\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Slab dimensions\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 1m x 2m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Coverage\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 2m² per slab\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Compressive strength\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 200kN\/m² (~20 tonnes\/m²)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Water-storage capacity\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 20l\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Water-drainage capacity (i=0.10)\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 3.86l\/(s·m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Temperature resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e -30°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Fire resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Class E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Accreditation\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Tested and CE marked\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch6\u003eFAQs\u003c\/h6\u003e\n\u003ch4\u003eHow much water do UGR 60mm Boards store?\u003c\/h4\u003e\n\u003cp\u003eIts 60mm cavities store approximately 20 litres per square metre, suiting deeper substrates and larger planting.\u003c\/p\u003e\n\u003ch4\u003eDo UGR 60mm Boards include a filter layer?\u003c\/h4\u003e\n\u003cp\u003eNo. A separate geotextile filter layer must be installed above it when used beneath substrate.\u003c\/p\u003e\n\u003ch4\u003eWhat is the difference between UGR 40mm Boards and UGR 60mm Boards?\u003c\/h4\u003e\n\u003cp\u003eUGR 60mm Storage \u0026amp; Drainage Boards have deeper 60mm cavities storing ~20l\/m², versus ~15l\/m² for the 40mm UGR Boards. It suits particularly demanding intensive roofs with large shrubs and trees.\u003c\/p\u003e\n\u003ch4\u003eCan UGR 60mm Boards be used beneath paving?\u003c\/h4\u003e\n\u003cp\u003eYes, in compatible walkable or drivable systems. The cavities must receive the specified base\/bedding and the system be designed for the loading.\u003c\/p\u003e\n\u003ch6\u003eHelp\u003c\/h6\u003e\n\u003ch3\u003eFree advice for complex green roof projects\u003c\/h3\u003e\n\u003cp\u003ePlanning a roof garden with deeper substrate, trees, recreational space or paved areas? Our in-house technical team can provide free, practical guidance on whether UGR 60mm Storage \u0026amp; Drainage Boards are appropriate and which waterproofing, protection and filter layers your build-up may require.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEmail:\u003c\/strong\u003e \u003ca href=\"mailto:info@urbangreenroofs.com\" title=\"mailto:info@urbangreenroofs.com\"\u003einfo@urbangreenroofs.com\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelephone:\u003c\/strong\u003e \u003ca href=\"tel:+44%20117%20370%204018\" title=\"tel:+44 117 370 4018\"\u003e+44 117 370 4018\u003c\/a\u003e\u003c\/p\u003e","brand":"Urban Green Roofs","offers":[{"title":"Default Title","offer_id":54207510053207,"sku":"UGR60SDB2","price":41.75,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/0150\/9207\/files\/inside_fw_1.jpg?v=1785811613"},{"product_id":"8mm-deck-wall-drainage-membrane","title":"UGR 8mm Deck \u0026 Wall Drainage Membrane","description":"\u003ch6\u003eDescription\u003c\/h6\u003e\n\u003ch3\u003eReliable drainage for extensive green roofs\u003c\/h3\u003e\n\u003cp\u003eUGR 8mm Deck \u0026amp; Wall Drainage Membrane is a tough, high-strength drainage layer designed to help excess water move safely through a green roof system.\u003c\/p\u003e\n\u003cp\u003eIts 8mm studded recycled HDPE profile creates a clear drainage cavity above the primary waterproofing. A high-quality polypropylene geotextile is permanently bonded to the upper face, filtering soil fines and growing medium while allowing water to drain freely.\u003c\/p\u003e\n\u003cp\u003eThis combined drainage and filtration design saves installation time because there is no need to lay a separate loose filter fabric directly above the membrane.\u003c\/p\u003e\n\u003ch3\u003eBonded geotextile for easier installation\u003c\/h3\u003e\n\u003cp\u003eThe integrated geotextile performs several useful functions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHelps stop soil and substrate fines blocking the drainage cavity\u003c\/li\u003e\n\u003cli\u003eAllows water to flow through quickly\u003c\/li\u003e\n\u003cli\u003ePrevents the filter fabric from slipping during installation\u003c\/li\u003e\n\u003cli\u003eReduces compression of the fabric into the studded profile\u003c\/li\u003e\n\u003cli\u003eRemoves the need for a separate loose filter layer\u003c\/li\u003e\n\u003cli\u003eHelps keep the green roof build-up stable and correctly layered\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWith a drainage capacity of approximately 2.24l\/(s·m), UGR 8mm Deck \u0026amp; Wall Drainage Membrane provides effective water movement without adding a dedicated water-storage layer.\u003c\/p\u003e\n\u003ch3\u003eSuitable applications\u003c\/h3\u003e\n\u003cp\u003eUGR 8mm Membrane can be used within:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExtensive green roofs\u003c\/li\u003e\n\u003cli\u003eFlat roofs and low-pitched roofs\u003c\/li\u003e\n\u003cli\u003eHouses and residential extensions\u003c\/li\u003e\n\u003cli\u003eSheds, garages and garden buildings\u003c\/li\u003e\n\u003cli\u003eConservatories\u003c\/li\u003e\n\u003cli\u003eLarger commercial roof projects\u003c\/li\u003e\n\u003cli\u003eSelected intensive green roof build-ups\u003c\/li\u003e\n\u003cli\u003eWalkable landscaping areas\u003c\/li\u003e\n\u003cli\u003eDrivable landscaping systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts approximate compressive strength of 250kN\/m² makes it suitable for build-ups where green roof planting and trafficable surfaces may be combined, provided that the full system is correctly designed for the anticipated loads.\u003c\/p\u003e\n\u003ch3\u003eAvailable sizes\u003c\/h3\u003e\n\u003cp\u003eChoose from two roll sizes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2m x 10m: covers 20m²\u003c\/li\u003e\n\u003cli\u003e2m x 20m: covers 40m²\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 20m² version may be more manageable for smaller roofs, DIY installations or sites with restricted access. The 40m² version reduces the number of roll changes and adjoining sections on larger areas.\u003c\/p\u003e\n\u003ch3\u003eStrong, durable and long-lasting\u003c\/h3\u003e\n\u003cp\u003eUGR 8mm Deck \u0026amp; Wall Drainage Membrane is designed to provide reliable performance throughout the life of the green roof system. The membrane is:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eResistant to water\u003c\/li\u003e\n\u003cli\u003eResistant to alkalis and saline solutions\u003c\/li\u003e\n\u003cli\u003eResistant to organic acids\u003c\/li\u003e\n\u003cli\u003eUnaffected by minerals\u003c\/li\u003e\n\u003cli\u003eResistant to bacteria, fungi and other small organisms\u003c\/li\u003e\n\u003cli\u003eChemically resistant\u003c\/li\u003e\n\u003cli\u003eSuitable for temperatures between -30°C and +80°C\u003c\/li\u003e\n\u003cli\u003eGuaranteed against deterioration for 30 years\u003c\/li\u003e\n\u003cli\u003eTested and CE marked to the relevant standard\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhere UGR 8mm Membrane fits in the system\u003c\/h3\u003e\n\u003cp\u003eA typical extensive green roof build-up may include:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eStructural roof deck\u003c\/li\u003e\n\u003cli\u003ePrimary waterproofing layer\u003c\/li\u003e\n\u003cli\u003eRoot barrier, where required\u003c\/li\u003e\n\u003cli\u003eProtection fleece, where required\u003c\/li\u003e\n\u003cli\u003eUGR 8mm Deck \u0026amp; Wall Drainage Membrane\u003c\/li\u003e\n\u003cli\u003eBonded geotextile filter layer\u003c\/li\u003e\n\u003cli\u003eExtensive green roof substrate\u003c\/li\u003e\n\u003cli\u003eSedum, grasses, mosses or other suitable planting\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eFor dedicated root protection, install the \u003ca href=\"\/products\/green-roof-root-barrier\"\u003eUGR Green Roof Root Barrier\u003c\/a\u003e beneath the drainage membrane. A protective fleece can also help reduce the risk of light mechanical damage to the waterproofing and root barrier — see the \u003ca href=\"\/products\/green-roof-protection-fleece-300\"\u003eUGR Green Roof Protection Fleece 300\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstalling UGR 8mm Membrane\u003c\/h3\u003e\n\u003cp\u003eThe application surface should have a gradient of at least 2%. Complete the horizontal waterproofing and install any specified root barrier or protection fleece before laying the membrane.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eRoll UGR 8mm Deck \u0026amp; Wall Drainage Membrane out over the prepared surface with the bonded geotextile facing upwards.\u003c\/li\u003e\n\u003cli\u003eCut the dimpled membrane to the required length, taking care not to damage the waterproofing or other layers beneath.\u003c\/li\u003e\n\u003cli\u003eOverlap adjoining rolls by approximately 100mm.\u003c\/li\u003e\n\u003cli\u003eLift the loose geotextile edge and position it over the adjoining section.\u003c\/li\u003e\n\u003cli\u003eWhere additional joint protection is required, seal the connection using a compatible jointing tape or sealant.\u003c\/li\u003e\n\u003cli\u003eOnce installed, the membrane can immediately receive the specified extensive green roof substrate or compatible paving build-up.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThe bonded geotextile remains on the upper face beneath green roof substrate.\u003c\/p\u003e\n\u003ch3\u003eWalkable and drivable applications\u003c\/h3\u003e\n\u003cp\u003eUGR 8mm Membrane can also form part of compatible walkable and drivable landscaping systems.\u003c\/p\u003e\n\u003cp\u003eFor walkable areas, a suitable bedding course of sand, gravel or chippings is installed between the membrane and the finished paving.\u003c\/p\u003e\n\u003cp\u003eDrivable applications require a properly specified sub-base and bedding course between UGR 8mm Membrane and the finished pavement. Structural loading, drainage and the complete system build-up must be designed for the intended traffic.\u003c\/p\u003e\n\u003ch3\u003eImportant suitability note\u003c\/h3\u003e\n\u003cp\u003eUGR 8mm Deck \u0026amp; Wall Drainage Membrane is not suitable for inverted warm roof applications. For an inverted warm roof or a project requiring meaningful water storage as well as drainage, consider the \u003ca href=\"\/products\/20mm-storage-drainage-membrane-2m-x-10m\"\u003eUGR 20mm\u003c\/a\u003e or \u003ca href=\"\/products\/25mm-storage-drainage-membrane\"\u003eUGR 25mm\u003c\/a\u003e Storage \u0026amp; Drainage Membranes.\u003c\/p\u003e\n\u003cp\u003eUGR 8mm Membrane is also not a primary waterproofing membrane and must be installed above a suitable waterproofing system.\u003c\/p\u003e\n\u003ch6\u003eSpecifications\u003c\/h6\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eMaterial\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eRecycled HDPE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eGeotextile\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003ePolypropylene, approx. 100g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eMembrane weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eApprox. 550g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eTotal weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eApprox. 650g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eStud height\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eApprox. 8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eNumber of studs\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e1,710\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eColour\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eRoll width\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e2m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eRoll lengths\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e10m or 20m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eCoverage\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e20m² or 40m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eCompressive strength\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eApprox. 250kN\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eWater-drainage capacity\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eApprox. 2.24l\/(s·m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eTemperature resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e-30°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eFire resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eClass E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003eAccreditation\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003eTested and CE marked\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch6\u003eFAQs\u003c\/h6\u003e\n\u003ch4\u003eDoes UGR 8mm Membrane store water?\u003c\/h4\u003e\n\u003cp\u003eIt primarily provides drainage and filtration rather than dedicated storage. For water retention, consider UGR 20mm or UGR 25mm Storage \u0026amp; Drainage Membrane.\u003c\/p\u003e\n\u003ch4\u003eDoes it need a separate filter fabric?\u003c\/h4\u003e\n\u003cp\u003eNo. A polypropylene geotextile is permanently bonded to its upper surface.\u003c\/p\u003e\n\u003ch4\u003eWhich way up should the membrane be installed?\u003c\/h4\u003e\n\u003cp\u003eBonded geotextile facing upwards towards the substrate or landscaping build-up.\u003c\/p\u003e\n\u003ch4\u003eCan UGR 8mm Membrane be used on an inverted warm roof?\u003c\/h4\u003e\n\u003cp\u003eNo. UGR 20mm or UGR 25mm Storage \u0026amp; Drainage Membrane may be more appropriate, subject to the overall specification.\u003c\/p\u003e\n\u003ch6\u003eHelp\u003c\/h6\u003e\n\u003ch3\u003eNeed help selecting the right drainage membrane?\u003c\/h3\u003e\n\u003cp\u003eUnsure whether your project needs straightforward drainage or a membrane that also stores water for the vegetation? Our in-house technical team can provide free, practical advice on choosing between UGR 8mm Membrane and the higher-capacity drainage and storage membranes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEmail:\u003c\/strong\u003e \u003ca href=\"mailto:info@urbangreenroofs.com\" title=\"mailto:info@urbangreenroofs.com\"\u003einfo@urbangreenroofs.com\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelephone:\u003c\/strong\u003e \u003ca href=\"tel:+44%20117%20370%204018\" title=\"tel:+44 117 370 4018\"\u003e+44 117 370 4018\u003c\/a\u003e\u003c\/p\u003e","brand":"Urban Green Roofs","offers":[{"title":"2m x 10m (20m²)","offer_id":54207510544727,"sku":"UGR8DWDM20","price":143.25,"currency_code":"GBP","in_stock":true},{"title":"2m x 20m (40m²)","offer_id":54207510577495,"sku":"UGR8DWDM40","price":243.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/0150\/9207\/files\/PermaSEAL_PRO_8_Main_Image_1000_x_1000.jpg?v=1788432256"},{"product_id":"11mm-deck-drainage-membrane-2m-x-15m","title":"UGR 11mm Deck Drainage Membrane 2m x 15m","description":"\u003ch6\u003eDescription\u003c\/h6\u003e\n\u003ch3\u003eHeavy-duty drainage for green roofs and podium decks\u003c\/h3\u003e\n\u003cp\u003eUGR 11mm Deck Drainage Membrane is a high-performance protection and drainage membrane for intensive green roofs, podium decks and other heavily loaded landscaping applications.\u003c\/p\u003e\n\u003cp\u003eThe two-layer product combines an impermeable 11mm HDPE drainage membrane with a high-quality polypropylene geotextile permanently bonded to its upper surface. Water passes through the filter fabric and into the studded drainage cavity, allowing it to move quickly across the surface while helping prevent soil and other particles from obstructing the drainage path.\u003c\/p\u003e\n\u003cp\u003eWith a compressive strength of over 500kN\/m², it is particularly well suited to projects where deeper substrates, trees and other heavy vegetation sit alongside paved or trafficked areas.\u003c\/p\u003e\n\u003ch3\u003eDrainage and protection in one membrane\u003c\/h3\u003e\n\u003cp\u003eUGR 11mm Deck Drainage Membrane performs two important functions within the roof build-up:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast surface drainage:\u003c\/strong\u003e The 11mm cavity provides a clear route for water to drain away.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproofing protection:\u003c\/strong\u003e The strong membrane helps protect the primary waterproofing against mechanical damage and thermal stress.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts bonded geotextile also:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFilters soil fines and other particles\u003c\/li\u003e\n\u003cli\u003eHelps prevent siltation of the drainage cavity\u003c\/li\u003e\n\u003cli\u003eResists slipping and compression under increasing loads\u003c\/li\u003e\n\u003cli\u003eRemoves the need for a separate loose filter fabric directly above the membrane\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe membrane can provide up to approximately 3.15l\/(s·m) of drainage capacity.\u003c\/p\u003e\n\u003ch3\u003eDesigned for high loading and traffic\u003c\/h3\u003e\n\u003cp\u003eUGR 11mm Deck Drainage Membrane has a specially reinforced and grooved stud profile, with approximately 4,000 studs per square metre.\u003c\/p\u003e\n\u003cp\u003eThe high number of studs and smooth reverse surface distribute loads across the underlying waterproofing. With a correctly specified base and sub-base above it, the membrane can form part of systems supporting heavy vehicles and heavily landscaped intensive green roofs. Suitable applications include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIntensive and extensive flat green roofs\u003c\/li\u003e\n\u003cli\u003ePodium decks\u003c\/li\u003e\n\u003cli\u003eBuried roofs\u003c\/li\u003e\n\u003cli\u003eBalconies and terraces\u003c\/li\u003e\n\u003cli\u003eRoof gardens with trees and deep substrates\u003c\/li\u003e\n\u003cli\u003eLandscaped areas beside vehicle routes\u003c\/li\u003e\n\u003cli\u003eWalkable slabs and paving\u003c\/li\u003e\n\u003cli\u003eDrivable pavements\u003c\/li\u003e\n\u003cli\u003eRecreational spaces and public landscaped areas\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is especially useful where planted and paved zones meet, as the same membrane can continue beneath both types of build-up.\u003c\/p\u003e\n\u003ch3\u003eInnovative interlocking joints\u003c\/h3\u003e\n\u003cp\u003eThe studs along the outer rows have specially designed indentations. When adjoining sheets overlap, a row of studs securely interlocks with the neighbouring membrane. This push-button connection:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHelps prevent movement between adjoining sheets\u003c\/li\u003e\n\u003cli\u003eMakes alignment easier\u003c\/li\u003e\n\u003cli\u003eSupports quicker installation\u003c\/li\u003e\n\u003cli\u003eDoes not depend on dry weather in the way that some taped joints do\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCompatible jointing tape can still be installed between the sheets where a fully sealed connection is required.\u003c\/p\u003e\n\u003ch3\u003eImpact sound reduction\u003c\/h3\u003e\n\u003cp\u003eUGR 11mm Deck Drainage Membrane has been tested to BS EN ISO 10140 and can provide impact sound reduction of up to 34dB within suitable insulated flat roof structures.\u003c\/p\u003e\n\u003cp\u003eThis may provide an additional benefit for balconies, terraces, podiums and other areas exposed to regular foot traffic.\u003c\/p\u003e\n\u003ch3\u003eWhere UGR 11mm Deck Drainage Membrane fits in the system\u003c\/h3\u003e\n\u003cp\u003eA typical horizontal build-up may include:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eStructural roof deck\u003c\/li\u003e\n\u003cli\u003eVapour-control and insulation layers, where specified\u003c\/li\u003e\n\u003cli\u003ePrimary waterproofing\u003c\/li\u003e\n\u003cli\u003eRoot barrier, unless the waterproofing is root resistant\u003c\/li\u003e\n\u003cli\u003eUGR 11mm Deck Drainage Membrane 2m x 15m\u003c\/li\u003e\n\u003cli\u003eGreen roof substrate, base material or landscaping build-up\u003c\/li\u003e\n\u003cli\u003eVegetation, paving or another suitable finish\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eWhere separate root protection is required, install the \u003ca href=\"\/products\/green-roof-root-barrier\"\u003eUGR Green Roof Root Barrier\u003c\/a\u003e beneath UGR 11mm Deck Drainage Membrane.\u003c\/p\u003e\n\u003ch3\u003eInstalling UGR 11mm Deck Drainage Membrane horizontally\u003c\/h3\u003e\n\u003cp\u003eThe surface of a large flat roof or deck should have a gradient of at least 2%. Complete the primary waterproofing and any required root-protection layer before installing the membrane.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eUnroll UGR 11mm Deck Drainage Membrane across the waterproofed surface with the bonded geotextile facing upwards.\u003c\/li\u003e\n\u003cli\u003ePull back the geotextile beside the flange of the preceding sheet.\u003c\/li\u003e\n\u003cli\u003ePosition the adjoining roll so the specially shaped outer studs overlap and interlock.\u003c\/li\u003e\n\u003cli\u003eApply compatible jointing tape between the sheets where a completely sealed connection is required.\u003c\/li\u003e\n\u003cli\u003eWhere the roll needs to be extended lengthways, place the next section beneath the preceding membrane with a 200mm overlap.\u003c\/li\u003e\n\u003cli\u003eCut the membrane to fit without damaging the waterproofing beneath.\u003c\/li\u003e\n\u003cli\u003eTurn the membrane up adjoining walls or parapets by at least 150mm, or to the upper edge of the finished fill.\u003c\/li\u003e\n\u003cli\u003eProtect or cap any exposed vertical edge with a suitable sealing detail.\u003c\/li\u003e\n\u003cli\u003eComplete the build-up with the specified green roof substrate, base material or paving system.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eA single 2m x 15m roll covers 30m². Once the complete deck has been covered, materials may be moved across it by wheelbarrow. Wheeled loaders are only permitted after at least 200mm of suitable base material has been installed.\u003c\/p\u003e\n\u003ch3\u003eLong-lasting, resistant construction\u003c\/h3\u003e\n\u003cp\u003eUGR 11mm Deck Drainage Membrane is:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWaterproof and vapour resistant\u003c\/li\u003e\n\u003cli\u003eResistant to salts\u003c\/li\u003e\n\u003cli\u003eRot resistant\u003c\/li\u003e\n\u003cli\u003eResistant to contaminants and chemicals\u003c\/li\u003e\n\u003cli\u003eSuitable for temperatures between -30°C and +80°C\u003c\/li\u003e\n\u003cli\u003eSafe for contact with drinking water\u003c\/li\u003e\n\u003cli\u003eTested and CE marked to the relevant standard\u003c\/li\u003e\n\u003cli\u003eCompliant with BS EN 13252\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eImportant suitability note\u003c\/h3\u003e\n\u003cp\u003eUGR 11mm Deck Drainage Membrane is a protection and drainage membrane, not a primary waterproofing or dedicated water-storage layer. It must be installed above a suitable waterproofing system, with a root barrier where the waterproofing itself is not root resistant.\u003c\/p\u003e\n\u003cp\u003eWhere retaining water for intensive planting is the main requirement rather than supporting exceptionally heavy loads, consider the \u003ca href=\"\/products\/40mm-storage-drainage-board-1m-x-2m\"\u003eUGR 40mm\u003c\/a\u003e or \u003ca href=\"\/products\/60mm-storage-drainage-board-1m-x-2m\"\u003eUGR 60mm Storage \u0026amp; Drainage Board 1m x 2m\u003c\/a\u003e green roof solutions.\u003c\/p\u003e\n\u003ch6\u003eSpecifications\u003c\/h6\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Membrane material\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e Virgin HDPE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Geotextile\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e Polypropylene Typar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Stud height\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e 11mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Total weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e Over 700g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Number of studs\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e Approx. 4,000\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Colour\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Roll width\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e 2m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Roll length\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e 15m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Coverage\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e 30m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Compressive strength\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e Over 500kN\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Water-drainage capacity\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e Up to approx. 3.15l\/(s·m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Impact sound reduction\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e Up to 34dB (BS EN ISO 10140)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Temperature resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e -30°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Compliance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e BS EN 13252\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top; width: 48.4796%;\"\u003e Accreditation\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px; width: 51.6073%;\"\u003e Tested and CE marked\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch6\u003eFAQs\u003c\/h6\u003e\n\u003ch4\u003eWhat is UGR 11mm Deck Drainage Membrane used for?\u003c\/h4\u003e\n\u003cp\u003eFast drainage and mechanical protection above waterproofing — intensive green roofs, podium decks, terraces, balconies and walkable or drivable landscaping.\u003c\/p\u003e\n\u003ch4\u003eDoes UGR 11mm Deck Drainage Membrane include a filter layer?\u003c\/h4\u003e\n\u003cp\u003eYes. A polypropylene geotextile is bonded to the upper surface.\u003c\/p\u003e\n\u003ch4\u003eHow are adjoining rolls connected?\u003c\/h4\u003e\n\u003cp\u003eThe shaped outer-row studs overlap and interlock; compatible jointing tape can be added for a fully sealed joint.\u003c\/p\u003e\n\u003ch4\u003eDoes the membrane store water for plants?\u003c\/h4\u003e\n\u003cp\u003eNo. Its main functions are drainage and protection. For water retention, consider UGR 40mm\/60mm Storage \u0026amp; Drainage Board.\u003c\/p\u003e\n\u003ch6\u003eHelp\u003c\/h6\u003e\n\u003ch3\u003eFree advice for heavily loaded green roof projects\u003c\/h3\u003e\n\u003cp\u003eCombining trees, deep growing media and vehicle or pedestrian traffic requires careful consideration of the complete roof build-up. Our in-house technical team can provide free guidance on whether UGR 11mm Deck Drainage Membrane is suitable and how it should work with your waterproofing, root protection and finished landscaping.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEmail:\u003c\/strong\u003e \u003ca href=\"mailto:info@urbangreenroofs.com\" title=\"mailto:info@urbangreenroofs.com\"\u003einfo@urbangreenroofs.com\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelephone:\u003c\/strong\u003e \u003ca href=\"tel:+44%20117%20370%204018\" title=\"tel:+44 117 370 4018\"\u003e+44 117 370 4018\u003c\/a\u003e\u003c\/p\u003e","brand":"Urban Green Roofs","offers":[{"title":"Single Unit","offer_id":54767629533527,"sku":"UGR11DDM30","price":267.25,"currency_code":"GBP","in_stock":true},{"title":"6-Roll Pack","offer_id":54767629566295,"sku":"UGR11DDM30P","price":1108.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/0150\/9207\/files\/Glossy_black_fluted_drainage_membrane_New_Fw.jpg?v=1791560128"},{"product_id":"20mm-storage-drainage-membrane-2m-x-10m","title":"UGR 20mm Storage \u0026 Drainage Membrane 2m x 10m","description":"\u003ch6\u003eDescription\u003c\/h6\u003e\n\u003ch2\u003eDrain, store and filter water in one layer\u003c\/h2\u003e\n\u003cp\u003eUGR 20mm Storage \u0026amp; Drainage Membrane is an all-in-one water-management layer for extensive and intensive green roofs.\u003c\/p\u003e\n\u003cp\u003eManufactured from recycled high-density polyethylene, its 20mm-deep studded cavities temporarily store rainwater to support healthy vegetation. Perforations within the membrane allow excess water to drain into the space below, helping prevent the growing medium and plant roots from becoming saturated.\u003c\/p\u003e\n\u003cp\u003eA high-quality geotextile filter layer is permanently bonded to the upper face. This prevents soil fines and growing medium from blocking the drainage cavities while also removing the need to install a separate loose filter fabric.\u003c\/p\u003e\n\u003ch2\u003eWhy water management matters\u003c\/h2\u003e\n\u003cp\u003eA successful green roof needs to retain useful moisture while allowing excess rainfall to drain away safely.\u003c\/p\u003e\n\u003cp\u003eUGR 20mm Storage \u0026amp; Drainage Membrane performs three important functions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eWater storage:\u003c\/b\u003e Holds approximately 6 litres of water per square metre for use by the vegetation\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDrainage:\u003c\/b\u003e Allows excess water to pass through the perforated membrane\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFiltration:\u003c\/b\u003e Prevents soil and fine particles from obstructing the drainage cavities\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe bonded geotextile also helps prevent the filter layer from slipping or compressing into the storage cups during installation.\u003c\/p\u003e\n\u003ch2\u003eSuitable green roof applications\u003c\/h2\u003e\n\u003cp\u003eUGR 20mm Storage \u0026amp; Drainage Membrane can be specified for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExtensive green roofs with low-growing vegetation\u003c\/li\u003e\n\u003cli\u003eSemi-intensive green roof systems\u003c\/li\u003e\n\u003cli\u003eIntensive green roofs with deeper growing substrates\u003c\/li\u003e\n\u003cli\u003eFlat roofs and low-pitched roofs\u003c\/li\u003e\n\u003cli\u003eHouses and residential extensions\u003c\/li\u003e\n\u003cli\u003eGarages, sheds and garden buildings\u003c\/li\u003e\n\u003cli\u003eLarger commercial green roofs\u003c\/li\u003e\n\u003cli\u003eSoft landscaping over decks\u003c\/li\u003e\n\u003cli\u003eInverted warm roof applications\u003c\/li\u003e\n\u003cli\u003eSuitable walkable or drivable landscaping build-ups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts combination of drainage, storage and filtration makes it a versatile option for a broad range of domestic and professional green roof projects.\u003c\/p\u003e\n\u003cp\u003eFor walkable or drivable finishes, the bonded geotextile must be removed, the studs must be filled and the appropriate bedding or sub-base courses installed as part of the specified system.\u003c\/p\u003e\n\u003ch2\u003eStrong, durable and long-lasting\u003c\/h2\u003e\n\u003cp\u003eUGR 20mm Storage \u0026amp; Drainage Membrane has an approximate compressive strength of 150kN\/m², helping it withstand the loads applied by the green roof build-up above.\u003c\/p\u003e\n\u003cp\u003eThe recycled HDPE membrane is:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTough and durable\u003c\/li\u003e\n\u003cli\u003eResistant to water\u003c\/li\u003e\n\u003cli\u003eResistant to alkalis and saline solutions\u003c\/li\u003e\n\u003cli\u003eResistant to organic acids\u003c\/li\u003e\n\u003cli\u003eUnaffected by minerals\u003c\/li\u003e\n\u003cli\u003eResistant to bacteria, fungi and other small organisms\u003c\/li\u003e\n\u003cli\u003eSuitable for temperatures between -30°C and +80°C\u003c\/li\u003e\n\u003cli\u003eGuaranteed against deterioration for 30 years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe product is also tested and CE marked to the relevant standard.\u003c\/p\u003e\n\u003ch2\u003eWhere UGR 20mm Membrane fits in the system\u003c\/h2\u003e\n\u003cp\u003eA typical green roof build-up may include:\u003c\/p\u003e\n\u003col start=\"1\"\u003e\n\u003cli\u003eStructural roof deck\u003c\/li\u003e\n\u003cli\u003ePrimary waterproofing layer\u003c\/li\u003e\n\u003cli\u003eRoot barrier\u003c\/li\u003e\n\u003cli\u003eProtection fleece\u003c\/li\u003e\n\u003cli\u003eUGR 20mm Storage \u0026amp; Drainage Membrane\u003c\/li\u003e\n\u003cli\u003eBonded geotextile filter layer\u003c\/li\u003e\n\u003cli\u003eGreen roof substrate\u003c\/li\u003e\n\u003cli\u003eVegetation\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eWhere a dedicated root-protection layer is required, install the \u003ca href=\"https:\/\/urbangreenroofs.com\/products\/green-roof-root-barrier\"\u003eUGR Green Roof Root Barrier\u003c\/a\u003e beneath the drainage membrane.\u003c\/p\u003e\n\u003cp\u003eA protection fleece may also be specified to reduce the risk of light mechanical damage to the waterproofing and root barrier. Consider using \u003ca href=\"https:\/\/urbangreenroofs.com\/products\/green-roof-protection-fleece-300\"\u003eUGR Green Roof Protection Fleece 300\u003c\/a\u003e.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eInstalling UGR 20mm Membrane\u003c\/h2\u003e\n\u003cp\u003eThe application surface should have a gradient of at least 2%. Complete the horizontal waterproofing and install any other specified underlying layers before laying the membrane.\u003c\/p\u003e\n\u003col start=\"1\"\u003e\n\u003cli\u003eRoll out UGR 20mm Storage \u0026amp; Drainage Membrane over the prepared surface with the bonded geotextile facing upwards.\u003c\/li\u003e\n\u003cli\u003eCut the dimpled sheet to the required length, taking care not to damage the waterproofing or any underlying layers.\u003c\/li\u003e\n\u003cli\u003eOverlap adjoining rolls by approximately 100mm.\u003c\/li\u003e\n\u003cli\u003eLift the loose geotextile overlap and position it over the adjoining section.\u003c\/li\u003e\n\u003cli\u003eWhere the joint needs additional protection, seal it using an appropriate compatible jointing tape or sealant.\u003c\/li\u003e\n\u003cli\u003eOnce installed, the membrane can immediately receive the specified extensive or intensive green roof substrate.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThe membrane is supplied in a manageable 20m² roll and is installed by simply unrolling and cutting it to fit the roof layout.\u003c\/p\u003e\n\u003ch2\u003eImportant suitability note\u003c\/h2\u003e\n\u003cp\u003eUGR 20mm Storage \u0026amp; Drainage Membrane is not a primary waterproofing membrane or a substitute for dedicated root protection. Where roots could affect the waterproofing or roof structure, install the \u003ca href=\"https:\/\/urbangreenroofs.com\/products\/green-roof-root-barrier\"\u003eUGR Green Roof Root Barrier\u003c\/a\u003e beneath it.\u003c\/p\u003e\n\u003ch6\u003eSpecifications\u003c\/h6\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Material\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Recycled high-density polyethylene\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Membrane weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 1,000g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Geotextile\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Polypropylene, approx. 100g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Total weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 1,100g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Stud height\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Number of studs\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 400\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Colour\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Roll dimensions\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 2m x 10m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Geotextile overlap\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Additional 100mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Coverage\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 20m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Approximate roll weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e 22kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Water-storage capacity\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 6l\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Water-drainage capacity\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 9l\/(s·m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Air volume between studs\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 14l\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Compressive strength\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 150kN\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Temperature resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e -30°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Characteristic opening width\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 170μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Water permeability\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Approx. 100 × 10⁻³m\/s to EN ISO 11058\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Fire resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Class E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Chemical properties\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Chemically resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Additional properties\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Safe for drinking-water contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0; vertical-align: top;\"\u003e Accreditation\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0;\"\u003e Tested and CE marked to the relevant standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch6\u003eFAQs\u003c\/h6\u003e\n\u003ch4\u003eHow much water does UGR 20mm Membrane store?\u003c\/h4\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eIts 20mm cavities provide an approximate water-storage capacity of 6 litres per square metre. Excess water can pass through the perforated membrane into the drainage space beneath.\u003c\/p\u003e\n\u003ch4\u003eWhich way up should the membrane be installed?\u003c\/h4\u003e\n\u003cp\u003eInstall it with the bonded geotextile layer facing upwards, towards the growing substrate. The studded HDPE membrane sits beneath the geotextile.\u003c\/p\u003e\n\u003ch4\u003eDoes UGR 20mm Membrane need a separate filter layer?\u003c\/h4\u003e\n\u003cp\u003eNo separate loose filter fabric is normally required directly above the membrane because a polypropylene geotextile filter layer is already bonded to it.\u003c\/p\u003e\n\u003ch4\u003eCan it be used for both extensive and intensive green roofs?\u003c\/h4\u003e\n\u003cp\u003eYes. UGR 20mm Storage \u0026amp; Drainage Membrane is suitable for extensive, semi-intensive and intensive green roofs, subject to the overall system design, structural loading and planting requirements.\u003c\/p\u003e\n\u003ch6\u003eHelp\u003c\/h6\u003e\n\u003ch2\u003eNeed help choosing your drainage layer?\u003c\/h2\u003e\n\u003cp\u003eNot sure whether the UGR 20mm Storage \u0026amp; Drainage Membrane offers the right balance of water storage and drainage for your planting scheme, roof pitch or substrate depth? Our in-house technical team can provide free, practical advice on selecting compatible layers for your green roof.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEmail:\u003c\/strong\u003e \u003ca href=\"mailto:info@urbangreenroofs.com\" title=\"mailto:info@urbangreenroofs.com\"\u003einfo@urbangreenroofs.com\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelephone:\u003c\/strong\u003e \u003ca href=\"tel:+44%20117%20370%204018\" title=\"tel:+44 117 370 4018\"\u003e+44 117 370 4018\u003c\/a\u003e\u003c\/p\u003e","brand":"Urban Green Roofs","offers":[{"title":"Default Title","offer_id":54207514575191,"sku":"UGR20SDM20","price":202.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/0150\/9207\/files\/PermaSEAL_PRO_20P_Final_Image_1000x1000_edited.jpg?v=1788431828"},{"product_id":"20mm-deck-wall-drainage-membrane-2m-x-10m","title":"UGR 20mm Deck \u0026 Wall Drainage Membrane 2m x 10m","description":"\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eHigh-performance drainage for green roofs and landscaped decks\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe two-layer membrane combines a water-impermeable 20mm studded HDPE core with a polypropylene geotextile permanently bonded to its surface. Water passes through the filter fabric into the deep drainage cavity, where it can move freely towards the roof outlets or drainage system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe geotextile helps prevent soil fines and other small particles from entering and obstructing the drainage space, maintaining effective water movement beneath the green roof or landscaping build-up.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eDesigned for demanding loads\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eUGR 20mm Deck \u0026amp; Wall Drainage Membrane has a compressive strength of approximately \u003c\/span\u003e\u003cspan\u003e240kN\/m²\u003c\/span\u003e\u003cspan\u003e, equivalent to a pressure resistance of up to approximately 24 tonnes per square metre when correctly installed.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIts stud profile distributes loads across the surface beneath it, making the membrane suitable for correctly designed systems incorporating:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eIntensive green roofs\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eRoof gardens\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eDeep growing substrates\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cspan\u003eWalkable decks and patios\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eDrivable deck paving\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eHard landscaping\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eLandscaped roofs above underground car parks\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eOther heavily loaded roof build-ups\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe complete structure, surfacing and supporting layers must still be designed for the anticipated loading and traffic.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eFast drainage through a 20mm cavity\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe deep studded profile creates approximately \u003c\/span\u003e\u003cspan\u003e14 litres of open air space per square metre\u003c\/span\u003e\u003cspan\u003e beneath the geotextile.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThis provides a water-drainage capacity of approximately \u003c\/span\u003e\u003cspan\u003e9.28l\/(s·m) at 20kPa\u003c\/span\u003e\u003cspan\u003e, helping move excess water away from the planted or paved surface.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe product’s drainage capacity is stated as approximately 30 times higher than the requirement of drainage standard DIN 4095.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eIntegrated filtration layer\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe bonded polypropylene geotextile:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eAllows water to enter the drainage cavity\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFilters soil, substrate fines and other small particles\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eHelps prevent blockage of the drainage space\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eResists significant deformation as working loads increase\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eRemains securely positioned during installation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eRemoves the need for a loose filter fabric directly above the membrane\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFor horizontal green roof and landscaping applications, the geotextile faces upwards towards the substrate, gravel or overlying construction.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eSuitable applications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eUGR 20mm Deck \u0026amp; Wall Drainage Membrane can be used for horizontal drainage within:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eIntensive green roofs\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eRoof gardens\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eLandscaped podiums and decks\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eWalkable and drivable paving systems\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePatios over suitable waterproofed structures\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eEarth-retaining roofs above underground car parks\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eOther hard and soft landscaping build-ups\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIt may also be installed vertically as a protection and drainage layer over primary external waterproofing on below-ground walls.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eWhere this membrane fits in a green roof\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eA typical horizontal build-up may include:\u003c\/span\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eStructural roof deck\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePrimary waterproofing and any specified gas or radon barrier\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eRoot barrier, where required\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eProtection layer, where specified\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003eUGR 20mm Deck \u0026amp; Wall Drainage Membrane\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eGrowing substrate, aggregate or specified landscaping build-up\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eVegetation, paving or another compatible finish\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eWhere separate root protection is required, install \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/urbangreenroofs.com\/products\/green-roof-root-barrier\"\u003eUGR Green Roof Root Barrier\u003c\/a\u003e.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eHorizontal installation\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe surface to be drained should have a fall of at least \u003c\/span\u003e\u003cspan\u003e2.2%\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eComplete the primary waterproofing and any required root barrier or protection layers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eBegin at the lowest part of the roof or deck fall.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eRoll out UGR 20mm Deck \u0026amp; Wall Drainage Membrane with the bonded geotextile facing upwards.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePull back the loose geotextile edge to expose the dimpled membrane.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eApply compatible jointing tape or a bead of membrane adhesive between the first and second rows of studs.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePosition the next roll above the first, overlapping approximately three rows of studs.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePress the connection firmly together and return the geotextile over the joint.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eAt perimeter walls, rooflights and other upstands, take the membrane up by at least 150mm or to the upper edge of the finished substrate or infill.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eComplete the roof with the specified growing substrate, gravel or landscaping build-up.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFor jointing adjoining sheets, use \u003ca href=\"https:\/\/urbangreenroofs.com\/products\/membrane-jointing-tape-50mm-x-10m\"\u003eUGR Membrane Jointing Tape\u003c\/a\u003e. Alternatively, where appropriate, consider \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/urbangreenroofs.com\/products\/high-strength-membrane-adhesive-310ml-cartridge\"\u003eHigh Strength Membrane Adhesive\u003c\/a\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eVertical below-ground installation\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eUGR 20mm Deck \u0026amp; Wall Drainage Membrane may also protect and drain external below-ground waterproofing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe black drainage core is positioned against the waterproofed wall, with the geotextile facing outwards towards the backfill.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFor walls below 2m high, the 2m-wide membrane can potentially be installed horizontally without an intermediate lap. On taller walls, it should be cut into vertical sheets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eAdjoining sheets are overlapped so that the geotextile continues over the preceding drainage core. One to three rows of studs can be interlocked to help keep the rolls aligned, with the flat edge flange sealed using compatible tape.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe membrane should connect to a suitably designed and maintainable land drain or French drain at foundation level. The upper edge must be capped to prevent debris and backfill entering the drainage cavity.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eLong-lasting and resistant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eUGR 20mm Deck \u0026amp; Wall Drainage Membrane is:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eChemically resistant\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eSuitable for temperatures from -30°C to +80°C\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eSafe for contact with drinking water\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFire classified as Class E\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eGuaranteed against deterioration for 30 years\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eTested and CE marked to the relevant standard\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe membrane is manufactured from virgin HDPE, with a bonded polypropylene geotextile.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eImportant suitability note\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eUGR 20mm Deck \u0026amp; Wall Drainage Membrane is a \u003c\/span\u003e\u003cspan\u003eprotection and drainage membrane\u003c\/span\u003e\u003cspan\u003e, not a primary waterproofing membrane.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIt must be installed above a suitable, fully bonded waterproofing system. For below-ground structures, the complete design should form an appropriate Type A barrier system in accordance with BS 8102:2022.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIt is also primarily designed to drain water rather than retain it for vegetation. For a green roof membrane with dedicated water-storage capacity, consider \u003c\/span\u003e\u003ca href=\"https:\/\/urbangreenroofs.com\/products\/20mm-storage-drainage-membrane-2m-x-10m\" style=\"font-size: 0.875rem;\"\u003eUGR 20mm Storage \u0026amp; Drainage Membrane\u003c\/a\u003e, \u003cspan\u003e\u003ca href=\"https:\/\/urbangreenroofs.com\/products\/40mm-storage-drainage-board-1m-x-2m\"\u003eUGR 40mm Storage \u0026amp; Drainage Board\u003c\/a\u003e or \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/urbangreenroofs.com\/products\/60mm-storage-drainage-board-1m-x-2m\"\u003eUGR 60mm Storage \u0026amp; Drainage Board\u003c\/a\u003e.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch6\u003eSpecifications\u003c\/h6\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Material\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Virgin HDPE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Membrane weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Approx. 1,000g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Geotextile\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Polypropylene, approx. 100g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Total weight\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Approx. 1,100g\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Stud height\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Approx. 20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Number of studs\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Approx. 400\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Colour\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Roll dimensions\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e 2m x 10m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Coverage\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e 20m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Compressive strength\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Approx. 240kN\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Max pressure load\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Approx. 24 tonnes\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Water-drainage capacity\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Approx. 9.28l\/(s·m) at 20kPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Air volume between studs\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Approx. 14l\/m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Temperature resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e -30°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Characteristic opening width\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Approx. 170μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Water permeability\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Approx. 100 × 10⁻³m\/s (EN ISO 11058)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Fire resistance\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Class E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Chemical properties\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Chemically resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Drinking-water safe\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Yes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Accreditation\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e Tested and CE marked\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px 6px 0px; vertical-align: top;\"\u003e Guarantee\u003c\/th\u003e\n\u003ctd style=\"padding: 6px 0px;\"\u003e 30 years against deterioration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch6\u003eFAQs\u003c\/h6\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eDoes UGR 20mm Deck \u0026amp; Wall Drainage Membrane waterproof the roof?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eNo. It is a protection and drainage layer that must be installed above a suitable primary waterproofing system.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eDoes it include a filter layer?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003eYes. A polypropylene geotextile is permanently bonded to the studded membrane, helping prevent soil and other small particles from blocking the drainage cavity.\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eWhich way up should the membrane be installed?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003eFor horizontal green roof and deck applications, install it with the geotextile facing upwards. On external walls, the black drainage core faces the waterproofed wall and the geotextile faces the backfill.\u003c\/p\u003e\n\u003ch4\u003eCan it be used for both extensive and intensive green roofs?\u003c\/h4\u003e\n\u003cp\u003eYes, subject to overall system design, structural loading and planting requirements.\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eDoes UGR 20mm Deck \u0026amp; Wall Drainage Membrane store water for plants?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003eIts primary function is rapid drainage and protection rather than dedicated plant-water storage. For water retention, consider \u003ca href=\"https:\/\/urbangreenroofs.com\/products\/20mm-storage-drainage-membrane-2m-x-10m\"\u003eUGR 20mm Storage \u0026amp; Drainage Membrane\u003c\/a\u003e, \u003ca href=\"https:\/\/urbangreenroofs.com\/products\/40mm-storage-drainage-board-1m-x-2m\"\u003eUGR 40mm Storage \u0026amp; Drainage Board\u003c\/a\u003e or \u003ca href=\"https:\/\/urbangreenroofs.com\/products\/60mm-storage-drainage-board-1m-x-2m\"\u003eUGR 60mm Storage \u0026amp; Drainage Board\u003c\/a\u003e depending on the project build-up.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch6\u003eHelp\u003c\/h6\u003e\n\u003ch3\u003eNeed help comparing the drainage membranes?\u003c\/h3\u003e\n\u003cp\u003eNot sure whether the UGR 20mm's 6l\/m² storage capacity is right for your planting, or whether a lower- or higher-capacity membrane would better suit the roof? Our in-house technical team can provide free advice on product selection, roof build-up and compatible supporting layers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEmail:\u003c\/strong\u003e \u003ca href=\"mailto:info@urbangreenroofs.com\" title=\"mailto:info@urbangreenroofs.com\"\u003einfo@urbangreenroofs.com\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelephone:\u003c\/strong\u003e \u003ca href=\"tel:+44%20117%20370%204018\" title=\"tel:+44 117 370 4018\"\u003e+44 117 370 4018\u003c\/a\u003e\u003c\/p\u003e","brand":"Urban Green Roofs","offers":[{"title":"Default Title","offer_id":54857459695959,"sku":"UGR20DWDM20","price":187.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/0150\/9207\/files\/PermaSEAL_20_Geodrain_Main_Image_1000_x_1000.jpg?v=1788425451"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/0150\/9207\/collections\/Green_Roof_Drainage_Water_Storage.jpg?v=1786087000","url":"https:\/\/urbangreenroofs.com\/collections\/green-roof-drainage-water-storage.oembed","provider":"Urban Green Roofs","version":"1.0","type":"link"}