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 method of assembling a fire-rated wall having a head-of-wall deflection gap, comprising:
attaching a footer track to a horizontal floor element;
attaching a header track to a 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, the second planar portion of the flange being recessed inwardly from the first planar portion, the header track having at least one fire-retardant and heat-expandable material strip attached to the web, wherein the fire-retardant material strip is positioned between and contacts both the web and the horizontal ceiling element when the header track is attached to 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;
positioning a plurality of vertical wall studs between the footer track and the header track and attaching each of the studs to at least one of the footer track and the header track;
attaching at least one piece of wallboard to the plurality of wall studs such that the wallboard is in direct contact with the first planar portion of the flange and such that the wallboard is not in direct contact with the second portion, wherein the attaching the wallboard comprises attaching the wallboard with an upper edge spaced from the horizontal ceiling element to define a deflection gap therebetween;
positioning a compressible backer rod within the deflection gap between the upper edge of the wallboard and the horizontal ceiling element; and
applying a combination of joint compound and joint tape 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 method of assembling a fire-rated wall of claim 1 , wherein the attaching the at least one piece of wallboard comprises attaching a first piece of wallboard and a second piece of wallboard on top of the first piece of wallboard to create a double-layer of wallboard, and wherein the compressible backer rod has a circular cross-section.
3. The method of assembling a fire-rated wall of claim 1 , wherein the positioning the compressible backer rod within the deflection gap comprises positioning the compressible backer rod such that 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.