US Patent 6871472 Sealed roof and method for sealing a roof

A method for sealing a roof is disclosed herein. The roof is of the type comprising an inclined substrate and a first layer of shingles. The first layer of shingles has a first side and a second side wherein the first layer of shingles first side is attached to the substrate. The method comprises a first party selecting a second party to seal the roof. The first party provides a waterproof membrane having a first side and a second side to the second party. The second party positions the membrane first side adjacent at least a portion of the first layer of shingles second side. The second party attaches a second layer of shingles to the substrate, wherein the second layer of shingles is adjacent the membrane second side.