{"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":true},{"title":"2m x 10m (20m²)","offer_id":54207509397847,"sku":"UGR25SDM20","price":232.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/0150\/9207\/files\/PermaSEAL_PRO_25P_Main_Image_1000_x_1000.jpg?v=1788432467","url":"https:\/\/urbangreenroofs.com\/products\/25mm-storage-drainage-membrane","provider":"Urban Green Roofs","version":"1.0","type":"link"}