Fire-rated wall construction product
Fire-rated wall construction components and wall systems for use in building construction. Embodiments can include tracks for holding studs which incorporate various geometries capable of receiving fire-retardant material, including but not limited to intumescent material. The fire-retardant material can be attached to the tracks such that the fire-retardant material expands and seals gaps and/or areas between the tracks and wall components such as ceilings, floors, and drywall. Various assemblies and methods can be used to cover the deflection gap.
1. A fire-retardant wall system, comprising:
a horizontal ceiling element;
a plurality of vertical wall studs;
a header track for receiving the wall studs, the track connected to the horizontal ceiling element, the track comprising a web and a pair of spaced-apart flanges extending in the same direction from opposite edges of the web, each of the flanges having a first planar portion proximal the web and a second planar portion distal the web;
at least one surface on the web for accepting a fire-retardant material strip thereon;
at least a first fire-retardant material strip attached to the at least one surface on the web and configured to expand when exposed to elevated heat, the first fire-retardant material strip positioned between and contacting both the web and the horizontal ceiling element to create at least a substantial seal inhibiting the passage of air from one side of the track to the other side of the track through a gap between the horizontal ceiling element and the web when the fire-retardant material strip is in an unexpanded state;
at least one piece of wallboard supported by the wall studs, wherein the wallboard is in direct contact with the first planar portion of the flange, and wherein the second planar portion of the flange is recessed inwardly from the first portion, such that the wallboard is not in direct contact with the second portion, the wallboard having an upper edge that is spaced from the horizontal ceiling element to define a deflection gap therebetween;
a compressible backer rod positioned within the deflection gap between the upper edge of the wallboard and the horizontal ceiling element;
a combination of joint compound and joint tape applied to the wallboard and covering the deflection gap to enclose the compressible backer rod between an outwardly-facing surface of one of the pair of flanges and the combination of joint compound and joint tape.
2. The wall system of claim 1 , wherein the compressible backer rod has a semi-circular cross-sectional shape.
3. The wall system of claim 2 , wherein a flat surface of the compressible backer rod faces outwardly and a rounded surface of the compressible backer rod faces inwardly toward the header track.
4. The wall system of claim 1 , wherein the at least one piece of wallboard comprises a first piece of wallboard and a second piece of wallboard layered on top of one another, and wherein the compressible backer rod has a circular cross-sectional shape.
5. The wall system of claim 1 , wherein the compressible backer rod is constructed from an open cell polyurethane foam.
6. The wall system of claim 1 , wherein the first fire-retardant material strip is positioned at a corner between the web and the at least one flange.
7. The wall system of claim 1 , wherein the web defines a recess and the first fire-retardant material strip is positioned in the recess.
8. The wall system of claim 1 , further comprising a plurality of fasteners, wherein each one of the plurality of fasteners attach one of the plurality of studs to the track, wherein the plurality of fasteners are located within the second planar portion of the at least one flange.
9. The wall system of claim 8 , further comprising a plurality of vertical slots formed within the second planar portion and spaced along a length of the track, wherein each one of the plurality of fasteners is passed through one of the plurality of vertical slots.