Description
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Defend Your Property with Flamex PF-2 Fire Retardant Spray
Flamex PF-2 is a premier, exterior-grade fire retardant spray engineered to provide robust protection for raw wood structures. Utilizing advanced flame retardant technology, it reacts chemically when exposed to extreme heat by releasing nitrogen and creating a char layer that starves the fire of oxygen. For contractors and specifiers, this mechanism significantly reduces flame spread, enhancing safety and compliance with stringent construction codes. The water-based formula is eco-friendly, non-toxic, and resistant to weather leaching. Applied effortlessly via sprayer, brush, or roller, Flamex PF-2 delivers a clear, durable defense without compromising the wood’s natural aesthetics.
Key Features & Benefits
- Deep Wood Penetration: The liquid penetrates deep into wood fibers. This action creates a structural protective barrier that limits flame spread to 25 and smoke developed to 70 under ASTM E-84 testing standards.
- Proven Weather Durability: Standard interior treatments fail outside. The specialized Flamex PF-2 formula resists leaching and UV degradation. It maintains reliable fire retardation for up to five years in demanding outdoor environments.
- Practical Application: You can apply this spray directly to cedar shingles, pressure-treated lumber, and decorative outdoor trim to help meet strict building codes.
Why Choose Flamex PF-2?
Flamex PF-2 is the superior choice for exterior wood protection, combining high-performance fire retardancy with exceptional outdoor durability. Its advanced formula penetrates deep into wood fibers, creating a resilient barrier that resists leaching, UV degradation, and weathering from rain and sun. For homeowners and builders alike, application is effortless using standard sprayers, rollers, or brushes, drying clear to preserve the wood’s natural beauty. Furthermore, its eco-friendly, non-toxic composition ensures safety around landscaping and pets. By reliably limiting flame spread on decks, siding, and fences, Flamex PF-2 delivers code-compliant, long-lasting peace of mind for any outdoor structure.
What wood species can Flamex PF-2 be applied to?
Redwood, Cedar, Pines, Aged Pressure-Treated Wood, Douglas Fir, Spruce, Hemlock, and others.
What is Flamex PF-2 and what does it do to exterior wood?
Flamex PF-2 is a Class A-rated fire retardant spray engineered specifically for raw exterior wood. It penetrates deep into wood fibers to create a structural barrier that slows flame spread and reduces ignition risk. Intertek Laboratories verified its fire performance under ASTM E-84 standards, recording a Flame Spread Index of 25 and a Smoke Developed Index of 70.
Unlike standard interior treatments, Flamex PF-2 is formulated to survive outdoor exposure. Its nanopolymer sealer resists UV degradation and water leaching—so rain and sunlight do not strip away your fire protection over time. The formula is non-toxic, dries clear, and includes a borate-based ingredient that also provides termite resistance. 
How does Flamex PF-2 achieve its Class A fire rating?
Flamex PF-2 earned its Class A fire rating through third-party laboratory testing by Intertek, conducted under the ASTM E-84 Surface Burn Test standard — the recognized benchmark for measuring flame spread and smoke development in building materials. A Flame Spread Index of 25 and a Smoke Developed Index of 70 place it firmly within Class A classification.
The test exposed Douglas Fir panels coated with Flamex PF-2 to direct flame inside a 25-foot tunnel furnace for ten minutes. Results measured ignition time, heat levels, and physical degradation. You can download the full Intertek Class A Test Report directly from natfire.com to verify these results before specifying the product on your project.
What types of wood can I treat with Flamex PF-2?
Flamex PF-2 works on a wide range of wood species and structures. You can apply it to redwood, cedar, pine, Douglas fir, spruce, hemlock, and aged pressure-treated wood—including surfaces that have already weathered outdoors.
Suitable applications include:
- Decks and fence panels — horizontal and vertical surfaces exposed to direct weather
- Exterior siding, trim, and shake shingles — including cedar shingle roofs and roof sheathing
- Pergolas, gazebos, and outdoor furniture — decorative structures in wildfire-risk zones
- Covered bridges and structural framing — where raw wood requires lasting fire defense
- Thatch, mulch, and straw — organic materials with high ignitability
If your wood surface is porous, clean, and completely dry, Flamex PF-2 can protect it.
How do I apply Flamex PF-2 correctly to get the best results?
Apply Flamex PF-2 at a rate of 125 square feet per gallon to a clean, dry, porous wood surface. Air temperature must be 50°F or above during application and must hold at that temperature for at least 24 hours afterward. Protect treated surfaces from rain for a minimum of 48 hours to allow full cure.
Follow these steps to protect the integrity of your treatment:
- Shake or mix thoroughly before use—do not skip this step
- Pretest a small, inconspicuous area to confirm compatibility and colorfastness
- Apply evenly and allow a full 48-hour cure before applying any water-based stain over the top
- Never mix with other products or add tints or dyes—doing so compromises the fire retardant chemistry
- Clean tools and hands immediately with soap and warm water
How often does Flamex PF-2 need to be reapplied to maintain fire protection on wood?
Plan to reapply Flamex PF-2 every three to five years on exterior wood surfaces. Weathering degrades fire retardant treatments over time, and high-moisture or rain-prone environments accelerate that process. Waiting too long between applications leaves your wood unprotected.
To confirm whether reapplication is needed before the five-year mark, test a small, inconspicuous area of the treated surface. If water repellency or surface integrity has noticeably declined, reapply. Consistent maintenance is not optional — it is the only way to ensure your fire protection remains structurally effective between treatment cycles. Flamex PF-2 was independently tested for exterior durability by Home Innovation Research Labs under ASTM D5401, confirming its water-repellent performance under real outdoor conditions.
Store Flamex PF-2 in its original container, away from direct sunlight and heat. Do not allow it to freeze. Shelf Life—12 months from purchase date
Burn Demo (Fatwood)
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