Pressure Treatment Process for Permanent Fire Retardancy

Pressure Treatment Process for Permanent Fire Retardancy

FSR’s Permanent Fire Retardant Treatment Process

Our process starts with the stacked pallets of either shakes or shingles being loading into our large pressure autoclave cylinder. There the computer controlled system begins pulling a full vacuum, removing all air and moisture from the wood. Our fire retardant is then pumped into our pressure cylinder until the cedar roofing is completely submerged with chemical. As the fire retardant fills the vessel, the air vacuum that was previously drawn, pulls the chemical into the empty fibers of the wood. Next, the pressure is increased up to 150 psi and additional chemical is pushed even deeper into the wood. Once the required amount of chemical is retained, the remaining chemical is drained from the pressure vessel. The product is then removed and transferred over to our kiln. There, the product is slowly cured for several days to ensure the fire retardant is completely bonded to the wood.

Autoclave FSR

Autoclave at FSR facility

Ultra violet radiation, the most damaging element to long-term exposure to weather, has been proven over history to only affect the surface of the shingle. Pressure impregnated fire retardant shingles have chemicals imbedded inside the product, which makes this topical exposure irrelevant.

Rain, freezing temperatures, and wind cannot remove the fire retardants from within the shingles. This is due to the curing process that bonds the chemicals to the inner fibers of the wood.

No topical or spray-on fire retardant product on the market can compete with the lifespan of the pressure impregnation process.

See the Treatment options available.