A case of arson in a school in South Carolina is described where the fire was greatly limited because the wood roof trusses and plywood roof deck in the 1-story masonry building were fire-retardant- treated. Before building, the wood was deeply impregnated with chemicals, under high pressure. When subjected to heat, these chemicals reduce the amountes of flammable gases that normally contribute to flame spread. When the source of the heat is removed, the wood stops burning. After the fire, the 3/4-inch plywood roof deck showed no evidence of any cracking, crumbling, warping, shrinking, or buckling resulting from the heat. The plywood acted as an insulation, saving the roofing from damage and discoloration. It is suggested that the damage could have been limited even further if a fire-retardent-treated plywood fire barrier had been installed every 40 feet or so in the attic space to reduce the draft.

  • Corporate Authors:

    American Wood Preservers Institute

    1651 Old Meadow Road
    McLean, VA  United States  22101
  • Publication Date: 1971

Media Info

  • Features: Photos;
  • Pagination: 3 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00153016
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 19 1977 12:00AM