| 摘要 |
<p>A non-combustible roofing system 10 for construction comprising a sloped or flat shear diaphragm supported on light gauge cold rolled metal framing 13, the shear diaphragm comprising a reinforced, lightweight, dimensionally stable structural cementitious panel 20 and the framing 13 comprising metal roofing elements, the panel 20 having a density of 65 to 90 pounds per cubic foot and capable of resisting shear loads when fastened to framing 13 and comprising a continuous phase resulting from the curing of an aqueous mixture comprising, on a dry basis, 35 to 70 weight % reactive powder, 20 to 50 weight % lightweight filler, and 5 to 20 weight % glass fibers, the continuous phase being reinforced with glass fibers and containing the lightweight filler particles, 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 panel 20 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 10, and wherein the roofing system 10 meets the 2 hour fire resistance test rating under ASTM E-119, effective 2003.</p> |
