Curtis lumber wood playsets11/21/2023 ![]() ![]() Treated lumber and plywood may not require the same level of maintenance as untreated wood used outdoors, but it does require some regular attention to maximize its lifespan. Will the material be used in-ground or elevated? Will it need to sustain standing water or will it be used vertically or at an angle to allow rapid water run off? Do you intend to paint or stain the treated wood? Be sure to choose wood treated to the right chemical concentration based on its intended use. Whether building a deck, adding a raised bed to the garden or used for barn construction and siding, treated lumber is an ideal choice for any outdoor construction project. Preservative Treated Lumber Can Be Used For Any Outdoor Project Refer to AWPA for the complete list of Use Categories and detailed explanations for each.Įxterior Above Ground, Coated w/ Rapid Water RunoffĮxterior Above Ground, Uncoated w/ Rapid Water Runoff The more common Use Categories for residential applications are below. Preservative treated materials are typically tagged with a label identifying the treatment chemical, concentration and intended use categories. above-ground, ground contact, marine use. The American Wood Protection Association (AWPA) defines standards of concentration and Use Categories to guide selection of treated material based on application, e.g. Treated lumber comes in varying levels of chemical concentration to achieve long-term durability based on their intended use. Most commonly found today are Copper Azole (CA), Micronized Copper Azole (MCA), and Alkaline Copper Quaternary (ACQ). Replacing CCA, there are many chemical formulations approved for use in residential applications. Check the local building code to determine whether CCA-treated material may be used for the project. Wood products treated with CCA are no longer used in most residential settings, including decks and children’s playsets. With concerns about CCA as a carcinogen, effective December 31, 2003, chromated arsenical manufacturers voluntarily canceled virtually all residential uses of CCA. In general, treated softwoods like SYP, fir and spruce, are cheaper than hardwoods and wood species like cedar, cypress and teak that are naturally rot and insect resistant.įrom the 1940s until the early 2000s, Copper Chromium Arsenate (CCA) was the primary preservative treatment used. ![]() Southern Yellow Pine (SYP) is most frequently used for treatment, though other pine species, Douglas Fir, and spruce are also treated. Not all species of wood can be treated due to their density, so you’ll not find any treated hardwoods. Preservative treated lumber and plywood is pressure-infused with chemical formulations to help prevent damage from insects and rot. What Is Preservative Treated Lumber & Plywood? This review discusses the nature of preservative-treated wood, the chemicals used to prevent damage from water and insects, and guidance on the appropriate use of preservative treated materials. ![]() While there are times when treated lumber is a huge benefit, there are other instances where it may not be the best solution. Preservative treated lumber and plywood is a great way to help ensure constructions withstand the test of time and resist damage from water or termites.
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