FlameFreez® brand fire retardant treated wood from the makers of YellaWood® brand products.
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FlameFreez® brand is a fire rated lumber and plywood product pressure impregnated with FlameTechTM Interior Type A High Temperature (HT) fire retardant chemicals. FlameTechTM fire retardant is a proven certified formulation based on the American Wood Protection Association P50 Standard for Fire Retardants.
Made for interior areas not exposed to the weather or wetting and where the adopted building code permits fire retardant treated wood (FRTW). FlameFreez® brand also meets the requirements for FRTW listed in the International Code Council Acceptance Criteria ICC AC66, conforming with the International Residential and the International Building Codes (IR & IBC).
Additional Details
About FlameFreez® brand
- Pressure treated with FlameTechTM fire retardant chemicals to provide long-term protection (not a paint or coating)
- Treated with an Interior Type A High Temperature (HT) fire retardant
- Proven formulation based on the American Wood Protection Association P50 Standard for Fire Retardants
- Meets the requirements for FRTW listed in the International Code Council Acceptance Criteria ICC AC66 conforming with the International Residential and the International Building Codes (IRC & IBC)
- Complies with AWPA UC-1 and UCFA use category systems
- Treatment process meets AWPA T1 standard
- 50-Year Limited Warranty against structural failure due to heat or humidity
- Recommended for above-ground, weather-protected applications
- Building Code compliant*
- Kiln dried after treatment
- Strength tested under high temperature and high humidity conditions
- Cut or sawn with typical woodworking tools
- Non-corrosive
- Can be painted or stained
FlameFreez® brand FRTW products are recommended for use in commercial and residential applications. As an Interior Type A Fire Retardant, they can be used for the following interior areas not exposed to the weather or wetting and where the adopted building code permits the use of wood or fire-retardant treated wood.*
- Sill plates
- Roof trusses
- Rafters
- Studs and other framing members
- Plywood roof, wall and floor sheathing
- Beams, joists and purlins
- Plywood sub-flooring
- Steps and stairways
- Partition walls
- Blocking and furring
- Window and door headers
Certifications
- UL Classified with an FR-S Rating for flame spread and smoke development values of 25 or less
- Flame spread and smoke development ratings of 25 or less when subjected to ASTM E84 surface burning characteristics in a test of 30-minute duration without evidence of significant progressive combustion
- Qualifies for the UL "FR-S", Class A, "Class I" classification for surface burning characteristics
- Meets all major model building code requirements described in the ICC Evaluation Service, LCC. ESR-4056
- Backed by a 50-year Limited Warranty
- 1-Hour Tested Wall Assembly (ASTM E119)**
- 2-Hour Tested Wall Assembly (ASTM E119)**
Easy To Identify
You'll have no problem spotting FlameFreez® brand products thanks to the red tint added in the treatment process. After treatment, the product is wrapped in a branded protective wrap for transport to the job site.
Product Availability
FlameFreez® brand is ready for your job site. Purchase by full unit or job lot, or get it all in one haul. Include FlameFreez® brand with your regular delivery of quality YellaWood® brand building products.
Important Fastener Information
The chemicals used in manufacturing FlameFreez® brand products have been evaluated for corrosivity in accordance with AWPA Standard E12 for a variety of metals. The corrosion rates for carbon steel, galvanized steel, aluminum, red brass, and copper are not significantly increased when the treated wood products are used as recommended by the manufacturer and properly sized for the materials selected.
TSO
Great Southern Wood Preserving, Inc. also offers Treating Services Only (TSO) for FRTW. Contact one of our representatives for more information and pricing.
*Consult local building codes to determine the specific uses allowed.
**See ICC ES Report, ESR-4056.
Frequently Asked Questions about Fire Retardant Treated Wood
What is fire retardant treated lumber and plywood?
Fire Retardant Treated Wood is lumber or plywood that has been pressure treated with chemicals to reduce flame spread and smoke development when exposed to fire. Defined by code, FRTW must meet specific building code standards (such as ICC AC66). When purchasing, check that the wood has a valid certification—like an ICC-ESR, UL Listing, or Intertek CCRR—confirming it meets the requirements of the International Building Code (IBC) and International Residential Code (IRC).
Where is fire retardant treated wood (FRTW) typically required?
FRTW is required in multi-family, commercial, institutional, and other Type I, II, or III construction where local building codes mandate fire retardant materials - especially for roof sheathing, wall assemblies, and partitions.
Does fire retardant treatment affect structural strength?
Properly treated FRTW retains its structural properties for design loads, but span ratings or load adjustments may apply depending on the manufacturer’s testing. For strength adjustment factors, it is recommended to refer to the ESR or similar documents.
How does FRTW differ from pressure treated (PT) wood for decay resistance?
Fire retardant treatment is for fire resistance, not for decay or insect resistance. Pressure treated wood is treated for rot, decay and termite attack, not fire. The two are not interchangeable.
Does fire retardant treated wood (FRTW) require special fasteners?
In most cases, standard fasteners are acceptable. However, always follow manufacturer guidelines, especially in corrosive environments.
How is fire retardant treated wood (FRTW) identified on the jobsite?
Each piece is stamped or labeled with information including the treating company, flame spread rating, and code compliance details.
How long does the fire protection last?
When properly installed and maintained in the correct environment (interior or exterior-rated as specified), the fire retardant properties are permanent and last the lifetime of the structure.
What are the main applications for fire retardant treated lumber vs. fire retardant treated plywood?
FRT lumber: studs, blocking, roof framing members, trusses (where allowed). FRT plywood: roof sheathing, wall sheathing, decking, and soffits.
What is the difference between interior and exterior fire retardant treated wood (FRTW)?
Interior FRTW is designed for dry, protected environments. Exterior FRTW is formulated to withstand moisture and humidity without losing fire retardant performance.
What happens if fire retardant treated wood (FRTW) gets wet during construction?
Temporary wetting usually does not affect the performance of FRTW, but extended saturation should be avoided. Exterior-rated FRTW is recommended for moisture-prone environments.
How should fire retardant treated wood (FRTW) be stored on site?
Keep FRTW covered, off the ground, and dry until installation. Avoid prolonged moisture exposure for interior FRTW products.
