Patent attributes
A fire retardant head-of-wall assembly configured to seal a linear head-of-wall construction joint or gap when exposed to a heat source such as a building fire is disclosed. The inventive fire retardant head-of-wall assembly comprises a header track having an elongated intumescent strip affixed lengthwise on at least one of the outer sidewall surfaces of the header track and above a centrally located and outwardly protruding lengthwise corrugated groove. The intumescent strip comprises expandable graphite and a fire retardant (C2-C8 alkyl diamine phosphate). When exposed to a heat source such as a building fire, the intumescent strip expands so to fill the head-of-wall construction joint or gap, thereby retarding or preventing the spread of smoke and fire. The inventive fire retardant head-of-wall assembly has been certified as complaint with respect to Underwriters Laboratories, Inc.'s standards set forth in its Tests for Fire Resistance of Building Joint Systems—UL 2079.
