Patent ID: 7790642

Claim:
A waterproof sheet comprising: a first layer including a first spunbonded fabric and a first waterproof plastomeric film, said first waterproof plastomeric film covering a surface of said first spunbonded fabric; a second layer including a second spunbonded fabric and a second waterproof plastomeric film, said second waterproof plastomeric film covering a surface of said second spunbonded fabric; and a third waterproof plastomeric film interposed between said first layer and said second layer, wherein said first layer is laterally offset from said second layer such that a lateral protrusion of said first layer extends laterally from said second layer on a first side of the waterproof sheet, and such that a lateral protrusion of said second layer extends laterally from said first layer on a second side of the waterproof sheet, said first side of the waterproof sheet being opposite to said second side of the waterproof sheet, and wherein said third waterproof plastomeric film is arranged such that a first portion of said third waterproof plastomeric film covers said lateral protrusion of said first layer and a second portion of said third waterproof plastomeric film covers said lateral protrusion of said second layer.