Close-up of Seam Tape Joining Two EPDM Membranes for Waterproof Roofing

To ensure a successful installation of EPDM roofing on your flat roof, follow these essential steps to create a durable, watertight join between EPDM rubber sheets.

Begin by ensuring both EPDM sheets are clean and dry. Remove any dirt, debris, or existing adhesive. For optimal cleanliness, use our membrane cleaner specifically designed for EPDM roofing.

Use a chalk pen to mark the overlap area on both EPDM sheets. Aim for a minimum overlap of 6 inches to ensure a secure bond.

Apply a thin, even coat of QuickBond EPDM primer to both overlapping surfaces using a scrub pad. Allow the primer to dry completely; it’s best to let it become tacky to ensure the adhesive bonds effectively. This step is crucial for achieving a strong connection.

Carefully align the two EPDM sheets, ensuring the overlap remains consistent. Once aligned, place your seam tape over the marked area, ensuring there is adequate overlap.

Press the sheets firmly together, starting from the centre and working outwards to expel any air bubbles. Use a silicone seam roller to apply pressure and secure a strong bond. For added durability, consider applying a bead of sealant along the edge of the seam tape. This extra step protects the edges and prevents any uplift of the EPDM membrane or seam tape.

By following these steps and using high-quality EPDM supplies from a trusted roofing supplier, you can ensure a reliable and watertight join for your EPDM waterproofing membrane on flat roofs.