Trusted by general, siding & framing contractors , deck builders, and architects.

Protect Exterior Wood, Siding & Timber with Flamex PF-2 Fire Retardant.

ASTM E84 Class A & ASTM D2898 Weather Tested Non-Leaching Outdoor Formula Zero Halogens / Low Odor & Non-Toxic

Price range: $24.00 through $2,100.00

Protect your property with Flamex PF-2 fire retardant spray for exterior wood. This Class A, ASTM E-84 certified spray prevents fire from small pre-ignition sources such as hot embers, grill coals, etc., while keeping natural grain visible.

■ Non-Toxic, Class A Rated By Intertek Laboratories
■ Laboratory Tested For Exterior Durability
■ Provides Termite Resistance
■ Dries Clear
■ Quantity Discounts For 5+ Containers
■ Free LTL Shipping on 55 Gallon Drums! (Lower 48 States Only)

Contact Us for LTL Shipping Rates!

125
Sq Ft Coverage
Per Gallon (Exterior Wood)

Flamex PF-2 Exterior Wood Fire Retardant Spray

As environmental conditions become increasingly unpredictable, protecting outdoor structures from fire hazards is no longer optional—it is a critical component of property maintenance. Whether you are managing a commercial deck, a residential gazebo, or wooden siding, untreated wood remains a significant fire risk.

To mitigate these dangers, the industry standard for high-performance protection is Flamex PF-2.

Why Exterior Wood Needs Fire Retardant Treatment

Wood is naturally combustible. When exposed to heat sources, embers, or dry conditions, outdoor structures can act as fuel for accidental fires. Traditional coatings often fail to penetrate deep enough or wash away during rain. Flamex PF-2 is engineered to resolve these issues by chemically altering the combustion characteristics of the wood fibers.

Key Benefits of Flamex PF-2

Flamex PF-2 provides a robust layer of defense designed specifically for exterior environments:

  • Enhanced Fire Resistance: It effectively slows flame spread and minimizes smoke development, giving emergency services more time to respond.
  • Deep Penetration: Unlike surface-level sealants, this formula absorbs into the wood grain, ensuring long-term protection that resists weathering.
  • Weather Durability: Formulated to withstand UV exposure and moisture, it remains effective even in harsh outdoor climates.
  • Safety Compliance: Utilizing this product helps ensure your structures meet stringent fire safety code requirements, potentially reducing insurance premiums.

Application Best Practices

For optimal results, proper application is essential. Follow these guidelines to ensure maximum surface protection:

  1. Surface Preparation: The wood must be clean, dry, and free of existing stains, paints, or sealants that would block absorption.
  2. Method of Application: Use a low-pressure sprayer, brush, or roller to apply the product uniformly.
  3. Saturation: Ensure the wood reaches full saturation, normally 3-4 passes, making sure each pass penetrates before applying the next one (wet-on-wet application).
  4. Curing: Allow the product to dry completely—typically 24 to 48 hours—before exposing the surface to heavy moisture or foot traffic.

Investing in fire prevention is an investment in the longevity of your property. If you are ready to secure your outdoor spaces against fire hazards, contact our technical support team to discuss volume pricing or to request a comprehensive product data sheet for Flamex PF-2.

Additional information

Weight N/A
Dimensions N/A
Size:

Quart, Quart Case, Gallon, Gallon Case, 5 Gallon Pail, 55 Gallon Drum

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ASTM E84 / Class A

Class A Fire Rating (Douglas Fir)

ASTM D-5401

Exterior Water Repellency

NFPA 255 / UBC 8-1

Standard Test of Surface Burning Characteristics

FORMULATED FOR OUTDOOR LUMBER & TIMBER

Why Professionals Specify Flamex PF-2

Engineered specifically for exterior environments, Flamex PF-2 penetrates deep into wood pores and forms a weather-resistant molecular bond that will not wash out, leach, or degrade under direct sun and rain.

Non-Leaching Molecular Bond

Deep penetrating formula chemically binds to wood lignocellulose fibers, preventing rain washout, leaching, or degradation under prolonged weather and rainfall exposure.

  • Resists rain wash-off & precipitation
  • Compatible with exterior stains, sealers & topcoats

Thermal Barrier & Intumescent Shield

Thermally decomposes when exposed to wildland or structural flames, building an insulated carbonaceous crust that chokes off oxygen and prevents flame propagation across exterior facades.

  • ASTM E84 Class A Flame Spread Index ≤ 25
  • Critical defense against airborne embers & wildfire sparks

UV & Climate Resistant Longevity

Formulated with advanced stabilizers to withstand harsh ultraviolet radiation, temperature cycling, freeze-thaw extremes, and high humidity without yellowing, chalking, or flaking.

  • Zero chalking, blistering or film peeling
  • Environmentally responsible, low VOC & safe for crews
Substrate Compatibility

Exterior Wood & Substrate Classifications

Flamex PF-2 requires an unsealed, absorbent porous exterior wood substrate for maximum cellular penetration and long-term weather resistance.

Recommended Exterior Substrates (Ready to Treat)

Exterior Siding & Shiplap

Cedar, Redwood, Cypress, Pine channel siding, and board & batten.

Outdoor Decking & Boardwalks

Douglas Fir, Southern Yellow Pine, Hemlock, and exterior treated timber.

Wood Shingles & Shakes

Western Red Cedar roof and sidewall shingles.

Heavy Timber Framing & Pergolas

Glulam beams, posts, outdoor pavilions, and gazebos.

Fences, Gates & Architectural Façades

Exterior decorative wood screens, privacy fencing, and exterior cladding.

Special Considerations & Incompatibilities

Sealed, Varnished, or Painted Exterior Wood

Waterproofing sealers, spar urethane, or acrylic paint prevent absorption. Must be stripped or sanded to raw wood.

Moisture Content (> 18%)

Do not apply onto damp or waterlogged wood after heavy rain. Ensure wood moisture is below 15-18% before treatment.

Dense Tropical Hardwoods (Ipe, Teak, Cumaru)

Extremely dense natural oils require solvent wipe and penetration test patch before full application.

Application In Wet Weather

Do not apply if precipitation is expected within 24-48 hours of treatment. Allow full curing.

Laboratory Verified

Technical Specifications & Data

Comprehensive chemical physical data, exterior test report, and environmental ratings for Flamex PF-2.

Property Specification Value
Physical State & Appearance Milky white / dries clear, non-corrosive
Specific Gravity 1.12 – 1.16 @ 68°F
pH Balance 6.0 – 7.0 (Neutral)
Odor Slight (Negligible odor dry)
Flash Point Non-flammable (Water-based)
Coverage Rate 125 sq. ft. per gallon for 1/2″ thick or more on wood substrate
Weathering Durability Rain & wash-resistant when fully cured (Non-leaching)
Technical Data Sheet View & Download
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Fire Test Standard Test Results Status / Authority
ASTM E84 (UL 723) Tunnel Test Flame Spread Index (FSI) ≤ 25 (Class A Rating) Intertek Laboratories
Smoke Developed Index (SDI) Smoke Index ≤ 50 (Well under Class A 450 limit) ASTM E84 Tunnel Protocol
NFPA 255 / NFPA 101 Compliant for Interior Finish Materials Life Safety Code Baseline
Uniform Building Code (UBC 8-1) Class 1 Fire Retardant Treatment Approval Model Building Code Compliant
Water Repellency (ASTM D5401) WRE 65% – Industry Standards: For heavy-duty exterior wood stabilization (like commercial decks, marine docks, or architectural millwork), industrial benchmarks often look for a WRE of 60% to 75%  Home Innovation Research Labs
Safety Metric Value & Status
VOC Content < 5.0 g/L (Low VOC Exterior Grade)
Toxicity Free of PBDEs, chlorine, bromine
Disposal Classification Non-hazardous / Do not pour down drain. Seal the liquid into secure containers for local waste pickup.
Shelf Life 1 year in original sealed container. Store at temperatures between (40°F to 85°F) away from direct sunlight and freezing conditions
Skin & Eye Safety Non-irritating when dried; mild aqueous rinse wet
Safety Data Sheet View & Download
Simple Workflow

How to Apply Flamex PF-2 to Exterior Wood

Follow these four straightforward steps to achieve certified exterior Class A fire resistance and weather longevity on outdoor wood.

1

Surface Prep & Moisture Check

Ensure exterior wood is raw, weathered clean, and dry with moisture under 18% using a moisture meter before treatment.

2

Spray, Brush, or Roll Application

Apply 1-2 uniform coats at 250-300 sq. ft./gal using an airless sprayer, garden pump sprayer, or soft bristle brush until saturated.

3

Penetration & Full Cure

Allow 24 to 48 hours dry time in dry outdoor conditions. Protect treated wood surfaces from precipitation until cured.

4

Optional Topcoat & Certify

Apply compatible exterior breathable stain/sealer if desired; issue official Certificate of Flame Resistance for inspector sign-off.

Common Questions

Frequently Asked Questions

Everything you need to know about exterior wood fire retardant regulations, rain resistance, application, and compliance.

No. Unlike interior formulations, Flamex PF-2 is engineered with a proprietary non-leaching resin matrix that chemically crosslinks within exterior wood fibers upon drying. It has undergone ASTM D5401 water repellency testing without loss of flame-retardant efficacy.

Yes. Once Flamex PF-2 has fully cured (24 to 48 hours), you can apply exterior penetrating stains, water repellents, or breathable exterior finishes. We recommend applying stains or sealers that are compatible with exterior fire-treated wood. Always perform a small test sample to verify aesthetic results.

Redwood, Cedar, Pines, Aged Pressure-Treated Wood, Douglas Fir, Spruce, Hemlock, and others.

For most exterior cedar siding, decking, and rough-sawn lumber,  3-4 consecutive wet coats applied approximately 5-10 minutes apart achieving 125 sq. ft. per gallon will deliver verified Class A protection. Wood should be dry with moisture under 18% prior to application.

Yes. Each order includes an official, project-specific Certificate of Flame Resistance detailing test standards (ASTM E84 Class A) for formal submission to building departments, fire inspectors, and insurance underwriters.

Plan to reapply Flamex PF-2 fire retardant every three to five years on exterior wood surfaces. Weathering degrades treatment 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 fire retardant was independently tested for exterior durability by Home Innovation Research Labs under ASTM D5401, confirming its water-repellent performance under real outdoor conditions.

Direct Technical Support

Our technical support can assist commercial designers, production managers, and decorators with testing advice, coverage calculations, and bulk freight options.

Direct Phone Line
+1 (219) 926-1477
BUSINESS HOURS
Mon – Fri: 8:00 AM – 5:00 PM CST

Technical Support Contact Form