Finishing and roof deck systems containing fibrous mat-faced gypsum boards

• US 5,319,900 A
• Filed: 05/06/1993
• Issued: 06/14/1994
• Est. Priority Date: 02/27/1984
• Status: Expired due to Term

• Current Assignee: Georgia-Pacific Gypsum LLC
• Original Assignee: Georgia-Pacific Corporation
• Inventors: Randall, Brian G., Lehnert, Charles W.
• Primary Examiner(s): Friedman, Carl D.
• Assistant Examiner(s): WILKENS, KEVIN DOUGLAS
• Application Number:
  US08/058,898
• Time in Patent Office: 404 Days
• Field of Search: 52/309.1, 52/309.12, 52/309.17, 52/408, 52/481, 52/809, 106/111, 106/116, 106/772, 106/778, 106/781
• US Class Current: 52/408
• CPC Class Codes: B28B 19/0092 to webs, sheets or the like, e.g. of paper, cardboard
• CPC Class Codes: B28B 23/0006 the reinforcement consisting of aligned, non-metal reinforcing elements
• CPC Class Codes: B32B 13/14 next to a fibrous or filamentary layer
• CPC Class Codes: E04C 2/043 of plaster E04C2/049 takes precedence
• CPC Class Codes: E04C 2/284 at least one of the materials being insulating
• CPC Class Codes: E04C 2/288 composed of insulating material and concrete, stone or stone-like material
• CPC Class Codes: E04D 11/02 Build-up roofs, i.e. consisting of two or more layers bonded together in situ, at least one of the layers being of watertight composition gravelling of flat roofs E04D7/00; venting or ventilation E04D13/17
• CPC Class Codes: E04D 13/1643 the roof structure being formed by load bearing corrugated sheets, e.g. profiled sheet metal roofs
• CPC Class Codes: E04D 13/1668 the insulating material being masses or granules applied in situ
• CPC Class Codes: E04F 13/047 Plaster carrying meshes

Abstract

Finishing systems and roof decks are provided which include a gypsum board having a set gypsum core faced with a fibrous mat. The gypsum core includes one or more additives which are effective in simultaneously improving the water and fire resistance of the board. In preferred embodiments, the board has sufficient water-resistant additive for absorbing less than about 10% water in an ASTM C-473 test.

Claims

1. Gypsum board comprising a set gypsum core faced with a fibrous mat, the gypsum core including one or more additives which are effective in simultaneously improving the water resistance and fire resistance properties of the board in an amount at least sufficient to impart to the board improved water resistance and fire resistance properties.

2. The gypsum board of claim 1, wherein said fibrous mat contains glass fibers.

3. The gypsum board of claim 1, wherein said core contains sufficient water-resistant additive for absorbing less than about 10% water in an ASTM C-473 test.

4. The gypsum board of claim 1, wherein said water-resistant additive comprises organohydrogenpolysiloxane.

5. The gypsum board of claim 3, wherein said core includes a fire-resistant additive which enables said board to achieve an ASTM E-119 fire rating of at least about 1 hour.