Pressure treatment forces chemical preservatives deep into the cellular structure of the wood in a closed cylinder under pressure enabling the preserved wood to maintain a chemical barrier against termites and decay for long periods of time. Pine Forest Lumber Company offers products that are guaranteed to resist decay and termite attack with a Limited Lifetime Warranty as well as untreated lumber and lumber treated to refusal.
A variety of preservative types are recognized as effective by the American Wood-Preservers Association (AWPA). Treated wood information appears on each warranteed pressure-treated product as an end tag. The information includes the AWPA Standard utilized in the treating process, the preservative retention level, intended end-use/application, and the name of the treating plant.
The most commonly used preservatives contain copper. As wood treated with these preservatives dries and reacts to the suns ultraviolet rays, the wood turns a greenish color. This is caused by a chemical reaction—part of the fixation process that binds the preservative to the wood.
Most lumber treated to 0.40 pounds per cubic feet (pcf) is suitable for ground contact, high moisture conditions and freshwater contact.
Lumber treated to 0.60 retention is used for wood foundations, structural timbers, guard rails, etc.
Pine Forest Lumber Company offers products treated with CCA, ACQ and micronized copper. CCA (chromated copper arsenate) is an inorganic arsenical; the most prevalent of the water-borne wood preservatives, commonly used anywhere termites and decay attach may occur, both indoors and outdoors. ACQ (ammoniacal copper quat) is a water-borne preservative containing copper and quaternary ammonium compounds.
Our SupaTimber CCA-treated products come with a Lifetime Limited Warranty for certain residential and agricultural uses. Our ACQ-treated products are treated with Preserve® or Preserve Plus®, providing the same level of reliable performance as standard pressure treated wood without the use of arsenic and chromium.
Treated wood extends forest resources by prolonging the life of wood products. Pressure-treated wood can last decades – 30, 40, even 50 years or more. The Southern Forest Products Association has estimated that pressure treatment conserves nearly 6.5 billion board feet of wood each year in the United States alone; the equivalent of 435,000 new houses, or 226,000,000 trees.
–Adapted from The American Wood Preservers Institute Guide for Consumers & Wood Industry Professionals Third Edition 2000