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Splicing And Seaming With Rubber To Rubber Adhesive (Seamtape Is Recommended Where Possible)

Fold the top ply of the seam back to expose the six inch (6") area to be seamed. Remove any bonding adhesive as noted in prior section. Using a clean cotton rag, clean both surfaces at the splice area with Membrane Cleaner at a maximum rate of two hundred (200) lineal feet per gallon. Be sure to clean a minimum of one inch (1") 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 CONTAMINANT'S FROM THE MEMBRANE.

WARNING: MEMBRANE CLEANER IS EXTREMELY FLAMMABLE!! USE UL APPROVED CONTAINERS.

Figure 15a

Figure 15b

Figure 15c

RUBBERALL® Rubber to Rubber Adhesive should be applied at a maximum rate of one hundred-thirty to one hundred-forty (130 – 140) lineal feet per gallon (8 – 10 mils 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 RUBBERALL® Membrane Cleaner and apply a one-quarter (1/4") bead of Lap Caulk centered over the seam edge. Make sure the caulk covers both the upper and lower parts of the seam membrane.

Note: Applying RUBBERALL® Lap Caulk should be the last application procedure. It is advisable to wait at least 4 hours after completing the seaming procedure before applying Lap Caulk. Applying Lap Caulk before the seams cure might cause the seam edge to distort and pucker.