Pressure-Treated Wood

Less durable woods, like Southern pine and Western fir, are treated with preservatives. This makes them more resistant to the elements, rot, and insects.

Chromated copper arsenate (CCA) is a wood preservative containing chromium, copper, and arsenic. Starting in the 1940s, CCA was used to make pressure-treated lumber. The United States Environmental Protection Agency (EPA) has classified CCA as a restricted-use product. Since 2003, the pressure-treated wood industry discontinued the use of CCA for residential use. Arsenic-free alternatives include ACQ, borates and copper azole.

Pros:

Cheap.

More available than wood in some areas.

Good for surface decking and structural parts

Cons:

Unnatural color

Warps or bends easily

Contains chemical preservatives

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