Use of fibrous mat-faced gypsum board in shaft wall assemblies and improved fire resistant board
AssigneeGeorgia-Pacific Corporation
InventorsCharles W. Lehnert, Brian G. Randall, George F. Fowler, Jr., Ray W. Hinkel
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Abstract
Glass mat-faced gypsum boards having a set core containing gypsum dihydrate and at least a minimum amount of chopped fibers, as well as other optional fire-resistant additives, are provided. The resulting boards obtain superior fire resistance properties over conventional paper-faced boards of like thickness which include a similar amount of chopped glass fibers.
Claims3
A glass mat-faced gypsum board comprising a set core containing gypsum dihydrate and at least about 0.03 wt. % chopped glass fibers, at least about 0.05 wt. % water-resistant additive, and paper fibers, whereby the board in 5/8 inch thickness achieves at least a one hour fire rating in accordance with ASTM E-119.
Dependencies are inferred from the claim text.