Patent ID: 7841148
Filing Date: 2010-11-30
Classification: B28B,C04B,E04B,E04C,Y02W,Y10T

Abstract:
1. A non-combustible roofing system for construction comprising: a sloped or flat shear diaphragm supported on light gauge cold rolled metal framing, 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 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 36.1weight % 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: wherein the cementitious panel is attached to the metal roofing elements by screws with winged driller located above the point and below the threads of the screw and protrude laterally from a shaft of the screw to provide a shear load bearing roofing system, further comprising a layer of Type X fire rated gypsum wallboard attached to a side of the frame opposed to said shear diaphragm to form a second diaphragm, and wherein the roofing system meets the performance of the 2 hour fire resistance test rating under ASTM E-119, effective 2003, wherein Type X fire rated gypsum wallboard is only on the one side of the frame opposed to the shear diaphragm, 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 panel has a thickness of about ½ to 1 ½ inches.