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High-strength elastic membrane adhesive
High Strength Membrane Adhesive is a powerful professional adhesive for bonding and sealing compatible plastic membranes.
Its solvent-containing formulation provides extremely high adhesion, while a specialist rubber component allows the completed bond to remain permanently elastic. This makes it particularly useful where membrane overlaps, penetrations and other details require a flexible cartridge-applied adhesive rather than jointing tape.
Suitable membrane materials
High Strength Membrane Adhesive is suitable for compatible membranes manufactured from:
- Polyethylene – PE
- Polypropylene – PP
- High-density polyethylene – HDPE
It can therefore be used with many common building membranes, including:
- Green roof membranes
- Root-barrier membranes
- Protection and drainage membranes
- Geotextile membranes
- Damp-proof membranes
- Cavity-drain membranes
- Roof-breather membranes
- Roofing membranes
Compatibility and bonding performance should always be tested before the main installation begins.
Green roof applications
Within a green roof system, High Strength Membrane Adhesive can be used for compatible details such as:
- Bonding overlapping membrane areas
- Sealing unavoidable service penetrations
- Detailing around roof features and changes in direction
- Joining suitable drainage membranes
- Securing compatible membrane details where tape is impractical
The UGR Green Roof Root Barrier datasheet specifically permits High Strength Membrane Adhesive for sealing unavoidable service penetrations through the root barrier — see the UGR Green Roof Root Barrier.
It may also be used as an alternative jointing method for compatible overlaps in the UGR 20mm Deck & Wall Drainage Membrane.
When to use adhesive rather than tape
High Strength Membrane Adhesive is supplied in a cartridge and applied as a bead. This makes it useful around irregular shapes, penetrations and details where applying a continuous strip of tape may be difficult.
For straightforward membrane overlaps, the UGR Membrane Jointing Tape 50mm x 10m or UGR Root Barrier Overtape - 300mm x 20m may be more appropriate. The appropriate method depends on the membrane, joint design and required system specification.
Preparing the membranes
Correct preparation is essential for achieving a reliable bond. Before application:
- Confirm that both membranes or substrates are compatible with High Strength Membrane Adhesive.
- Test the adhesive on a small area before completing the main installation.
- Make sure all surfaces are completely dry.
- Remove dust, dirt, debris, oil and grease.
- Position and secure the membranes before bonding.
- Make sure the overlap is flat, free from wrinkles and not under tension.
- Plan the joint so that the cured adhesive will not be subjected to unnecessary peeling or shear stress.
Applying High Strength Membrane Adhesive
- Prepare the cartridge for use in accordance with the product instructions.
- Apply a continuous bead to one of the prepared membrane surfaces.
- Bring the second membrane into position without stretching or pulling it.
- Press the two surfaces firmly together.
- Use a roller or similar suitable tool to distribute pressure evenly along the joint.
- Check that the bond is continuous and that no gaps or creases remain.
- Keep the membrane free from tension, peeling and shear stress while the adhesive strength develops.
The bond strength builds gradually over time. Do not introduce tension afterwards — for example, when mounting battens beneath a vapour-control layer to prevent sagging.
Permanently flexible adhesion
Unlike a rigid adhesive, High Strength Membrane Adhesive remains elastic after application.
This allows the completed joint to accommodate normal movement within a correctly installed membrane system while maintaining close contact between the bonded surfaces.
Important professional-use warning
High Strength Membrane Adhesive is for professional use only.
It contains solvents and is based on a highly flammable liquid and vapour. It can also cause serious eye irritation.
During use:
- Keep away from heat, sparks, flames and hot surfaces.
- Do not smoke near the product.
- Use outdoors or in a well-ventilated area.
- Avoid breathing the vapours.
- Prevent contact with the eyes.
- Use suitable personal protective equipment.
- Follow all instructions and safety warnings supplied with the product.
- Keep out of the reach of children.
Important suitability note
High Strength Membrane Adhesive is a bonding and sealing accessory. It does not replace the primary waterproofing, root barrier or drainage membrane within a green roof system.
Do not assume that it will bond successfully to every plastic, coating or treated surface. Carry out an on-site adhesion test before completing the installation.
For standard straight overlaps where a tape-based joint is specified, consider the UGR Membrane Jointing Tape 50mm x 10m.