Description
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Introduction:
Defend Your Property with Flamex PF-2 Fire Retardant Spray Exterior Wood
Leaving outdoor wood untreated exposes your property to rapid flame spread and severe structural damage. You need a tested, reliable barrier. Flamex PF-2 is a professional-grade exterior wood fire retardant spray. It delivers a Class A fire rating to secure raw lumber, siding, and trim against ignition risks.
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?
Using unclassified treatments on outdoor structures creates a false sense of security and leaves your building vulnerable. Flamex PF-2 delivers weather-resistant protection tested to meet rigorous safety standards. The non-toxic formula provides safe wood protection without introducing harmful chemicals to your property or surrounding soil. In high-risk fire zones, the safety of your home or business depends on an outdoor defense that actually lasts. Secure your investment today.
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 – 6 months from purchase date
Burn Demo (Wood)
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