Patent ID: 8136319

Claim:
A hail resistant roof system comprising: a roof deck; an insulation layer supported by said roof deck, wherein said insulation layer is more compressible and resilient than said roof deck; a frangible energy absorbing layer supported by said insulation layer, wherein said energy absorbing layer is of a different material than said insulation layer; and a waterproof membrane loose laid over said frangible energy absorbing layer, such that said waterproof membrane is completely unattached to any portion of the roof system at any area of said waterproof membrane running substantially parallel to a relatively upper surface of said frangible energy absorbing layer, said waterproof membrane only being attached to the roof system at an area of the waterproof membrane running substantially perpendicular to said relatively upper surface of said frangible energy absorbing layer; at least one intentional wrinkle in said waterproof membrane, said wrinkle being excess membrane material that is pulled upward from said relatively upper surface of said frangible energy absorbing layer relative to portions of said waterproof membrane on both sides of said wrinkle, said wrinkle being disposed over an open area of said relatively upper surface of said frangible energy absorbing layer that is absent any attachment structure, adhesive, or other structure protruding upwardly from said relatively upper surface of said frangible energy absorbing layer relative to a substantial remainder of said relatively upper surface of said frangible energy absorbing layer at any area under said wrinkle, said open area between said waterproof membrane and said relatively upper surface of said frangible energy absorbing layer at said wrinkle allowing said waterproof membrane to be pulled down towards said relatively upper surface of said frangible energy absorbing layer in response to hail impact upon the waterproof membrane without interference from any attaching to said relatively upper surface of said frangible energy absorbing layer or structure between said waterproof membrane and said relatively upper surface of said frangible energy absorbing layer at said wrinkle.