Preservative-treated wood is typically pressure-treated, where the chemicals are driven a short distance into the wood using a special vessel that combines pressure and vacuum.
New Rules for Pressure Treated Lumber. AWPA passed a proposal to revise its U1 Standard, which describes use cases for pressure treated lumber at different levels of retention a term used to describe the concentration of chemical preservative used to treat the wood .
In addition, on February 12, 2002, the United States Environmental Protection Agency USEPA announced a voluntary decision by industry to move consumer use of treated lumber products away from a variety of pressure-treated wood that contains arsenic by December 31, 2003, in favor of new alternative wood preservatives.
Pressure-treated wood is truly a "wood for all seasons" a rugged exterior building product that's rot and insect resistant. If Noah's ark was made from this stuff, it would still be cruising the Mediterranean Treated wood is used for decks, mailbox and light posts, swing sets and playscapes
FlamePRO brand from Koppers Performance Chemicals, is an interior Type A High Temperature HT fire retardant treated wood FRTW formulation, applied through pressure impregnation.
Today, pressure-treated lumber is treated with a range of inorganic chemicals rather than arsenate. Other common chemicals used are Alkaline Copper Quaternary ACQ , Copper Azole CA , Sodium
Pressure-treated lumber can last 20 years or more, and most pressure treated wood comes with a residential and agricultural limited warranty. ACQ/CA vs. MCA Pressure Treated Wood See details on the two primary types of pressure treated wood in the following chart.
Pressure-treated lumber is wood that has been immersed in a liquid preservative and placed in a pressure chamber. The chamber forces the chemical into the wood fibers. The chamber forces the chemical into the wood fibers.
Treated wood may contain Chromated Copper Arsenicals CCA , Creosote, or Pentachlorophenol. CCA, a wood preservative, is not considered hazardous to people with limited contact, but handling precautions are still recommended .
Pressure treated lumber products, such as YellaWood brand products, are treated in a pressurized cylinder. The treatment process forces a waterborne preservative deep into the cellular structure of the wood providing long-term protection against rot, fungal decay and termite attack.
Pressure-treated wood lasts longer. Image: treated pine image by Horticulture from Fotolia.com . Wood used for outdoor building is often pressure treated with a variety of chemicals to give it increased resistance to moisture, fungus and wood-eating insects.
Apart from structural wood preservation measures, there are a number of different preservatives and processes also known as timber treatment, lumber treatment or pressure treatment that can extend the life of wood, timber, wood structures or engineered wood.