Patent ID: 7765757

Claim:
A roof system comprising: a roof deck; a base layer of lightweight insulating concrete; a layer of expanded poly styrene board insulation including a top side, a bottom side and a spaced arrangement of holes formed through said board insulation from said top side to said bottom side, and said bottom side applied to said base layer of lightweight insulating concrete; a top layer of lightweight insulating concrete applied over said top side of said layer of board insulation and within said holes; and a plurality of anchoring devices structured and disposed for holding said top layer of lightweight insulating concrete anchored to said base layer of lightweight insulating concrete with said layer of expanded poly styrene board insulation sandwiched between said base layer and said top layer, said plurality of anchoring devices each including a base set into and anchored within said base layer of lightweight insulating concrete and a shank extending from the base and through a respectively aligned one of the holes in the board insulation and anchored into said top layer of lightweight insulating concrete.