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FlamePRO®Fire Retardant Treated Wood

End Uses

FlamePRO® brand fire retardant treated wood is typically permitted for interior, above ground applications such as: roof systems, studs, flooring, joists, sill plates (when not in direct contact with the ground), blocking and furring, and other interior applications.

The specifier and/or end user is responsible to review the test data on FlamePRO® brand fire retardant treated wood to determine if it is acceptable for the intended end use.

Typical applications include:

Architectural Specifications

General Product Information

  1. Lumber and plywood bearing the FlamePRO® mark has a flame spread rating of 25 or less (Class A) when tested in accordance with ASTM E84, “Standard Test Method for Surface Burning Characteristics of Building Materials.” FlamePRO® fire-retardant-treated wood shows no evidence of significant progressive combustion when the test is extended for an additional 20-minute period. In addition, the flame front does not progress more than 10 1/2 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).
  2. FlamePRO® fire-retardant-treated wood is manufactured under the independent third-party inspection of Underwriters Laboratories Inc. (UL), Timber Products (TP), or Southern Pine Inspection Bureau (SPIB). Follow-Up Service and each piece shall bear the UL, TP, or SPIB classified mark indicating the extended 30 minute ASTM E84 test.
  3. FlamePRO® shall be kiln dried after treatment (KDAT). The kiln drying process is monitored by Underwriters Laboratories, Inc. (UL) Timber Products (TP), or Southern Pine Inspection Bureau (SPIB). and the UL TP, or SPIB mark shall appear on the label.
  4. FlamePRO® shall be produced in accordance with International Code Council (ICC) Evaluation Service Report (ESR) ESR-4244.
  5. FlamePRO® FRTW products comply with AWPA UC-1 and UCFA use category systems, FlamePro® treatment process meets the AWPA T1 standard and FlamePro® chemical has been analyzed to confirm the formulation meets AWPA P50 standard.
    The FlamePRO® Fire Retardant has undergone rigorous testing and met stringent standards for low volatile organic compound (VOC) emissions. Products certified to this criteria are suitable for use in schools, offices, and other sensitive environments.
  7. Indoor Advantage Gold Certified. SCS Global Services has completed the evaluation of Koppers’s FlamePRO® Treated Lumber products. Koppers FlamePRO® Fire Retardant Treated Wood products meet all the necessary requirements to be certified Indoor Advantage Gold.

Fire-Retardant Treatment

  1. Treatment shall be FlamePRO® manufactured by Koppers Performance Chemicals.
  2. FlamePRO® is an interior “Type A” fire-retardant with individual surface burning characteristics for the species and products listed under UL Certifications.
  3. Structural performance of FlamePRO® fire-retardant-treated wood has been tested in accordance with ASTM D5564 for lumber and ASTM D5516 for plywood. Evaluation of plywood data is in accordance with ASTM D3201. Evaluation of lumber data is in accordance with ASTM D6305. The resulting design value and span rating adjustments are published in ICC ESR-4244, which includes evaluation of high temperature (HT) strength testing for roof applications.
  4. FlamePRO® fire-retardant-treated wood is kiln dried after treatment (KDAT) to maximum moisture content of 19% for lumber and 15% for plywood.
  5. FlamePRO® does not contain VOC’s, urea formaldehyde or formaldehyde, halogens, sulfates, chlorides, or ammonium phosphate.
  6. Plywood treated with FlamePRO® shall be manufactured under US Product Standards - PS 1 or PS 2. Panels shall have a minimum bond durability of Exposure 1.
  7. Grade marked lumber treated with FlamePRO® shall be in accordance with PS 20.


  1. FlamePRO® fire-retardant-treated wood used in structural applications shall be installed in accordance with the conditions and limitations listed in ICC ESR-4244. View the report.
  2. FlamePRO® fire-retardant-treated wood shall be installed in compliance with the requirements of the applicable building codes and product recommendations.
  3. FlamePRO® shall not be installed in areas where, in service, it is exposed to precipitation, direct wetting, or condensation.
  4. As with untreated wood, avoid exposure to precipitation during shipping, storage or installation. Apply a water resistive barrier or underlayment over dry sheathing as soon as practical to avoid precipitation on the panel. Panels that get wet should be allowed to dry before covering, or be replaced.

    DISCLAIMER OF LIABILITY FOR RELIANCE ON INFORMATION PROVIDED BY KOPPERS PERFORMANCE CHEMICALS: The information contained herein is true and accurate to the best of our knowledge, but is provided without warranty or guarantee. Since the conditions of use are beyond our control, Koppers Performance Chemicals (“Koppers”) disclaims all liability and assumes no legal responsibility for damages resulting from use of or reliance upon the information contained herein.

Download FlamePRO® Architectural Specifications Sheet.

Structural Durability

The structural durability of FlamePRO® brand fire retardant treated lumber and plywood has been verified by the certified engineers according to the latest and most stringent versions of ASTM strength durability standards. FlamePRO® brand fire retardant treated lumber and plywood has been tested by independent accredited laboratories, following industry standards ASTM D5564 & ASTM D5516 to develop strength design factors for various use conditions.

The National Design Specifications (NDS), Wood Handbook , and other publications have cautioned against the use of any wood product in environments exceeding 150 ̊F. Based on the strength data generated when tested per industry protocol at an accredited third party laboratory, professional engineers have calculated design values and span adjustments to modify the untreated design values for lumber and span ratings for plywood. These design values are applicable at temperatures up to 150 ̊F for lumber (see Tables 1 and 2*) and 170 ̊F for plywood (see Table 3*). *Tables 1, 2, and 3 can be found in the FlamePRO® Brochure.

FlamePRO® Building Code Approvals

Testing and Standards

Copies of tests are available to design professionals upon request.
For a complete specification contact us or call Northeast Treaters Inc. at 800-648-7328.