Lap seam and method forming same

Details Lap seam and method forming same Lap seam and method forming same

1990-10-17

1992-01-28

Lesmes, George F.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156314, 428 57, 428 58, 428189, 428194, C09J 504, C09J 510

Patent

active

050841190

ABSTRACT:
A liquid tight seam for an overlapping seam of two waterproof elastomeric membranes of a roof covering and the method of forming the seam. The overlapped edge portions of the two membranes are sealed by an intervening adhesive layer. A second adhesive layer is applied along the seam and covers adjacent exposed areas of the two membranes and stepped edges thereof which form the seam. Next, a bead of sealant is applied along the seam and over adjacent portions of the second adhesive layer. This seam and method eliminates washing and cleaning the seam areas with solvents before applying the sealant thereby enhancing seam quality and strength.

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patent: 4445955 (1984-05-01), Struve
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patent: 4774115 (1988-09-01), Ruehl et al.
patent: 4849268 (1989-07-01), Backenstow et al.
patent: 4855172 (1989-08-01), Chiu

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