Water resistant fire retardant roof underlayment sheet material

Details Water resistant fire retardant roof underlayment sheet material Water resistant fire retardant roof underlayment sheet material

B - Operations, Transporting

32

B

B32B 33/00 (2006.01) B32B 11/00 (2006.01) C09K 21/00 (2006.01) D06N 5/00 (2006.01) E04D 5/02 (2006.01)

Patent

CA 2365658

A sheet material is useful as a waterproof underlayment for a roof of a structure. The sheet material has upper and lower surfaces and comprises a web of reinforcing mat comprising fire-resistant fibers and a continuous non-porous matrix of water--resistant modified bitumen saturating the web of reinforcing mat, wherein the modified bitumen is self-adhesive.

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