The measurement of the flamespread rating of fire retardant hardwood plywood is discussed, laboratories that do commercial testing are reviewed, the characteristics of plywood panels are reviewed, and the 5 principal U.S. building codes are noted. Class I panels are usually bonded with special adhesives to prevent possible delamination during a fire. The degree of flamespread is also influenced by core construction and the density of the face veneer. Treated or noncombustible cores and low density face veneers are used to develop low flamespread. Mineral core panels produce low flame-spread rating on any wood faced paneling, and mineral core hardwood plywood will meet the most rigid code requirements. Lumber core, particle board, or veneer core panels can be manufactured to meet Class I requirements. Panel prices depend on cost of the species, type of panel construction, matching of veneers, thickness, length, etc.

  • Corporate Authors:

    American Wood Preservers Institute

    1651 Old Meadow Road
    McLean, VA  United States  22101
  • Authors:
    • McDonald, C E
  • Publication Date: 1970-4

Media Info

  • Pagination: 6 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00153024
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 4 1977 12:00AM