Wooden frame truss with enhanced fire resistance
AssigneeUnited States Gypsum Company
InventorGary Franklin Miller
Life of this patent
Estimating the term…
Abstract
A wooden frame truss with enhanced fire resistance is provided and includes an upper chord extending along a longitudinal axis, a lower chord disposed below the upper chord and extending along a vertically displaced, parallel axis, a plurality of supports attached between the upper and lower chords, and a plurality of metal gusset plates securing the supports to the chords. At least one wallboard batten strip is attached to an underside of the lower chord, the strip being constructed and arranged so that the strip defines a ledge extending from each side of the lower chord.
Claims9
A wooden frame truss with enhanced fire resistance for use in a ceiling system including a plurality of said trusses mounted in spaced parallel relation to each other, each said truss comprising:
- an upper wooden chord extending along a longitudinal axis;
- a lower wooden chord disposed below the upper chord and extending along a vertically displaced, parallel axis, a plurality of wooden supports attached between said upper and lower chords;
- a plurality of metal gusset plates securing said supports to said chords;
- and
- at least one wallboard batten strip attached directly to an underside of said lower chord, said strip defining a ledge extending from each side of said lower chord, such that a space is defined between ledges of adjacent trusses, and enhanced fire resistance is provided by said batten strip being attached to said lower chord, such that upon said truss being assembled in the ceiling system, with a plurality of said trusses, and having lengths of insulation supported by said ledges formed by said wallboard batten strips of the adjacent trusses, said ceiling system resists charring by fire for at least two hours.
A ceiling system, comprising:
- a plurality of wooden frame trusses with enhanced fire resistance, each said truss including:
- an upper wooden chord extending along a longitudinal axis;
- a lower wooden chord disposed below the upper chord and extending along a vertically displaced, parallel axis, a plurality of wooden supports attached between said upper and lower chords;
- a plurality of metal gusset plates securing said supports to said chords;
- at least one wallboard batten strip attached directly to an underside of said lower chord, each said wallboard batten strip being constructed and arranged so that said wallboard batten strip defines a ledge extending from each side of said lower chord;
- at least one length of insulation inserted between adjacent trusses, being placed upon and supported by said ledges such that said length of insulation extends between said adjacent trusses;
- at least one RC-1 strip secured to an underside of each said wallboard batten strip;
- and
- two layers of wallboard panels secured to said at least one RC-1 strip to form a ceiling, such that said at least one wallboard batten strip provides enhanced fire resistance, wherein upon said truss being assembled in the ceiling system, with a plurality of said trusses, and having lengths of insulation supported by said ledges formed by said wallboard batten strips of the adjacent trusses, said ceiling system resists charring by fire for at least two hours.
(canceled)
The ceiling system of claim 95, wherein panels of each said layer of wallboard extend in a direction normal to panels in the other layer.
Dependencies are inferred from the claim text.