Splicing and Seaming with Rubber To Rubber Adhesive
(Seam Tape Is Recommended Where Possible)
Fold the top ply of the seam back to expose the 15.24cms area to be seamed. Remove any bonding adhesive as noted in the previous section. Using a clean cotton rag, clean both surfaces at the splice area with Membrane Cleaner at a maximum rate of 30.96mtrs per 3.785ltrs. Be sure to clean a minimum of 25mm past the leading edge of the finished seam.
When cleaning the seam area, change the rags frequently. Do not allow the rags to become loaded with talc or other contaminants from the membrane.
WARNING: Membrane cleaner is extremely flammable!! Use UL Approved containers.
Rubber to Rubber Adhesive should be applied at a maximum rate of 36.62 – 42.67mtrs per US gallon (0.20 – 0.25mm’s thick when dry). Allow the Rubber to Rubber Adhesive to dry to the finger touch (tacky, not stringy).
IMPORTANT: When cleaning and applying rubber to rubber adhesive to the seam area, be sure to extend both procedures past the leading edge of the finished seam.
Starting in the middle of the seam, fold the top ply onto the bottom ply, working from the middle to the ends of the seam. Make sure to avoid wrinkles and fish mouths. Using a steel hand roller, roll the entire length of the seam from the middle toward the ends of the seam, then rolling parallel with the seam.
Clean the seam edge with Membrane Cleaner and apply a 6.35mm bead of Lap Caulk centred over the seam edge. Make sure the caulk covers both the upper and lower parts of the seam membrane.
Note: Applying Lap Caulk should be the last application procedure. It is advisable to wait at least 4 hours after completing the seaming procedure before application. Applying Lap Caulk before the seams cure might cause the seam edge to distort and pucker.