Head-of-wall fireblocks

  • US 8,136,314 B2
  • Filed: 10/18/2010
  • Issued: 03/20/2012
  • Est. Priority Date: 10/04/2007
  • Status: Active Grant
First Claim
Patent Images

1. A header track for use in a stud wall assembly, comprising:

  • an elongated web having a pair of spaced apart and downwardly extending sidewalls, each sidewall having inner and outer sidewall surfaces, andan elongated heat expandable intumescent strip affixed lengthwise on at least one of the outers sidewall surfaces of the pair of sidewalls, the intumescent strip having a composition that comprises;

    (A) from 5 to 95% by weight of expandable graphite;

    (B) from 1 to 70% by weight of a fire retardant;

    (C) from 1 to about 50% by weight of an inorganic filler dispersed in a emulsion of polyvinyl acetate or silicone.

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