When you're installing an EPDM roofing system, ensuring a proper seal is essential—especially at termination points. The ClassicBond® EPDM Water Cut-Off Mastic is the ideal choice for achieving a strong, reliable seal, whether you’re a professional roofer or tackling a DIY project. This high-performance, single-component butyl-blend mastic is designed to be used with EPDM membranes and other compatible roofing systems where a compression-type seal is required.
Formulated with excellent tackiness and low viscosity, this mastic remains pliable even after application, allowing it to maintain its grip under pressure. It's particularly well-suited for sealing between membranes or when a membrane is being terminated using a termination bar or similar compression fitting. It’s also commonly used in parapet wall detailing, where secure sealing is crucial.
Each tube covers approximately 3 linear metres when applied as an 11mm bead, which is the recommended size for effective performance. With a working temperature range of -40°C to +93°C and excellent cold-weather flexibility, this mastic performs reliably in all UK weather conditions.
Why Choose ClassicBond Water Cut-Off Mastic?
Strong Adhesion – Highly tacky for dependable sealing performance, even in compression-sealed areas.
Versatile Application – Ideal for use with terminations, wall abutments, and parapet walls.
Reliable Coverage – One tube provides approximately 3 linear metres of coverage at an 11mm bead.
Cold Weather Flexibility – Maintains performance in freezing temperatures down to -40°C.
Straightforward to Apply – Suitable for both roofing professionals and DIY users.
Shelf Life – Up to 12 months in an unopened container when stored in a cool, dry place.
Application Instructions
Surface Prep: Ensure the area is clean, dry, and free from dust, grease, oil, or moisture.
Apply Bead: Run an 11mm bead of mastic between the substrate and the membrane edge.
Secure the Termination: Press down and apply the correct termination bar or flashing to maintain consistent compression across the mastic bead.
Note: Avoid contact with skin and eyes, and use in a well-ventilated area. The product is flammable—keep it stored away from heat sources or open flames.
Product Details
Type: Butyl-blend mastic
Viscosity: 1,320,000 Cps (approximate)
Service Temperature: -40°C to +93°C
Coverage: Approx. 3 linear metres per tube (11mm bead)
Shelf Life: Up to 12 months (unopened)
Finish: Black
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