ClassicBond EPDM Contact Adhesive for Rubber Roofs

ClassicBond Contact Adhesive is used when installing EPDM rubber roofing on:

• Roof perimeters
• Upstands and vertical surfaces
• Angle changes
• Steep slopes
• Detail areas where strong initial grab is required
• As the deck adhesive on roofs over 100m²

On timber decks, it is typically used:

• Around the outer edges of the roof
• In a 150mm perimeter strip when water-based adhesive is used in the centre

On certain non-porous decks or commercial installations over 100m², it may be used to bond the entire roof area.

The contact adhesive is what locks the EPDM membrane in place at the most vulnerable parts of the roof.

Used correctly, it:

• Prevents membrane lifting at edges
• Resists movement caused by temperature changes
• Provides immediate grab once bonded
• Helps ensure the roof stays secure long-term

This is a critical component in a correctly installed ClassicBond EPDM rubber roofing system.

ClassicBond EPDM Contact Adhesive is suitable for bonding EPDM membrane to:

• Timber (OSB3 / plywood)
• Brick and blockwork
• Render
• Concrete
• Metal
• Plastics
• Approved insulation boards

Not suitable for use with expanded polystyrene (EPS).

• Apply using a short-pile roller or spreader brush
• Apply a thin, even coat to both surfaces being bonded
• Allow the adhesive to become touch dry before bonding (it should be tacky without leaving residue on your fingers)
• Carefully position the membrane — it cannot be repositioned once bonded
• Roll firmly to ensure full contact and remove trapped air
• Bonding times vary depending on surface type and conditions, typically between 2–20 minutes

• Stir thoroughly before use
• Ensure surfaces are clean, dry and dust-free
• Do not apply to wet or frosted surfaces
• Apply pressure with a roller after bonding
• Trimming can be carried out immediately after bonding
• Once stuck, the membrane cannot be lifted and repositioned

Approximate coverage when applied to both surfaces:

• 1.0L – covers approx. 1–2 m²
• 2.5L – covers approx. 4–5 m²
• 5.0L – covers approx. 7–10 m²

Coverage may vary depending on surface texture and porosity.

• Product: ClassicBond EPDM Contact Adhesive
• Type: Solvent-based bonding adhesive
• Base: Polychloroprene rubber / phenolic resin
• Colour: Golden brown
• Tack life: Approx. 2–20 minutes
• Coverage: Approx. 2.35–3 m² per litre
• Shelf life: 18 months (stored between 5°C and 25°C)
• Available sizes: 1L, 2.5L, 5L

Water-based adhesive does the bulk of the work but contact adhesive does the critical work.

Using contact adhesive correctly at perimeters and details is what stops edge lift, movement and long-term problems. It’s one of those products you only notice when it’s not used properly.