Patent ID: 7987647

Claim:
A concrete-free roof system for installation on an existing roof having a plurality of open web steel joists with an existing corrugated metal deck thereon, the existing corrugated metal deck having alternating top portions and bottom portions and being part of a structural diaphragm comprising: a plurality of deck straps mechanically fastened to the open web steel joists through the existing metal deck, each deck strap having a plurality of alternating spaced apart lower portions and a plurality of alternating spaced apart upper portions, the lower portions being integrally formed with the upper portions, the lower portions being attached to the open web steel joists and the upper portions extending upwardly of the existing metal deck, wherein the lower portions are dimensioned to be received within the corrugations of the existing metal deck and the length of each lower portion does not exceed the width of each bottom portion of the existing metal deck and each upper portion spans at least one of the top portion of the existing metal deck and is spaced above the top portion of the existing metal deck; a roof deck mechanically fastened to and in direct contact with the upper portions of the deck strap and forming part of the structural diaphragm; and roofing and insulation attached to the roof deck.