Fire Retardant Plywood

Fire Retardant Plywood Details:

Available in STRUC 1 configuration

  •  Fire retardant treated TrinityTree plywood—good 1 side (GS1)  bearing the PYRO-GUARD mark has a flame spread rating of 25 or less (Class A) when tested in accordance with ASTM E 84, “Standard Test Method for Surface Burning Characteristics of Building Materials”. PYRO-GUARD fire retardant treated plywood shows no evidence of significant progressive combustion when the test is extended for an additional 20 minute period. In addition, the flame front shall not progress more than 10½ feet beyond the centerline of the burners at any time during the test. The flame spread and smoke developed index for each species and product are classified by Underwriters Laboratories Inc (UL).
  • Panel thickness: (a) 18.26 mm (23/32 of an inch) - 4 ply Southern Yellow Pine  & (b) 18.26 mm (23/32 of an inch) - 7 ply West Coast Douglas Fir
  • Panel size: 2440mm x 1220mm ( 4 feet x 8 feet)
  • Packaging: 18.26 mm thick sheets / 48 sheets per pallet
  • Fire retardant treated TrinityTree plywood is manufactured under the independent third party inspection of Underwriters Laboratories Follow-Up Service and each piece shall bear the UL classified mark indicating the extended 30 minute ASTM E 84 test.
  • Fire retardant treated TrinityTree plywood shall be labeled kiln dried after treatment (KDAT). Timber Products Inspection, Inc. (TP) shall monitor the process and the TP mark shall appear on the label.
  • Fire retardant treated TrinityTree plywood shall be produced in accordance with ICC valuation Service Report 1791 (ESR-1791).
  • Fire retardant treated TrinityTree plywood meets the performance requirements of AWPA U1, Commodity Specification H for Use Category UCFA and AWPA C20/C27  Type A, HT).

 Fire Retardant Treatment:

  •  Structural performance of Fire retardant treated TrinityTree  plywood is in accordance with ASTM D 5516 for plywood. Evaluation of plywood data is in accordance with ATM D 6305. The resulting design value and span rating adjustments are published in ICC Evaluation Report ESR-1791, issued by the ICC Evaluation Service Inc. which includes evaluation of high temperature (HT) strength testing for roof applications.
  • Interior fire retardant treated plywood is kiln dried after treatment to maximum moisture content of 15% for TrinityTree plywood.
  • The fire retardant treatment does not contain halogens, sulfates, chlorides, ammonium phosphate, urea formaldehyde or formaldehyde.
  • TrinityTree plywood treated is manufactured under US Product Standard PS 1or PS 2. Panels shall have a minimum bond durability of Exposure 1.


  • Fire retardant treated TrinityTree plywood used in structural applications shall be installed in accordance with the conditions and limitations listed in ESR-1791 as issued by the ICC Evaluation Service, Inc.
  • Fire retardant treated TrinityTree plywood shall be installed in compliance with the requirements of the applicable building codes and product recommendations.
  • Treated TrinityTree plywood shall not be installed in areas where it is exposed to precipitation, direct wetting, or regular condensation. As with untreated wood avoid exposure to precipitation during shipping, storage or installation. Apply underlay over dry sheathing as soon as practical to avoid direct rain on the panel. Panels that get wet should be allowed to dry before applying underlay or it should be replaced.