Patent ID: 8065852
Filing Date: 2011-11-29
Classification: B28B,C04B,E04B,E04C,Y02W,Y10T

Abstract:
1. A method for providing a building structure with a roofing system by making the roofing system as a roof of the building structure, said roofing system comprising: a sloped or flat shear diaphragm supported on light gauge cold rolled metal framing of the building structure, the shear diaphragm comprising a reinforced, lightweight, dimensionally stable cementitious panel and the framing comprising metal roofing elements; the cementitious panel having a density of 65 to 90 pounds per cubic foot and capable of resisting shear loads when fastened to the framing and comprising a continuous phase resulting from the curing of an aqueous mixture comprising, on a dry basis, 49 to 68 weight % blend of reactive powders, 23 to 36.1 weight % uniformly distributed lightweight filler particles, and 5 to 20 weight % alkali-resistant glass fibers, and optional superplasticizer, the continuous phase being uniformly reinforced with the alkali-resistant glass fibers, and the lightweight filler particles comprising uniformly distributed ceramic microspheres, the lightweight filler particles having a particle specific gravity of from 0.02 to 1.00 and an average particle size of about 10 to 500 microns (micrometers), wherein the blend of reactive powders comprises: said making of the roofing system comprising: placing the cementitious panel on said metal roofing elements and attaching the cementitious panel to the metal roofing elements, wherein the system has a horizontal design shear capacity of the roof shear diaphragm of 300 to 1000 pounds per linear foot; wherein the cementitious panels are attached to the metal roofing elements with metal screws with winged drillers, the winged drillers are located above the point and below the first threads of the screw and protruding laterally from a shaft of the screw.