In 2004, after dominating the market for more than 70 years, wood treated with CCA (chromated copper arsenate) was withdrawn from residential use due to concerns about health risks from arsenic exposure. This created a vacuum that a wide variety of new wood preservatives have since attempted to fill. Some of these treatments have properties that are similar to CCA, but others are more corrosive and require different, pricier hardware and fasteners. Some aren’t very corrosive, but aren’t rated for ground contact. And for some, whether the lumber is rated for ground contact depends on the size of the material.
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