Q.I'm building an outdoor deck for a client who wants me to use lumber treated with micronized copper, in the belief that it's less harmful to the environment than wood treated with other chemicals. I'm not very familiar with the material. Can it be used in ground-contact applications, including load-bearing posts?A.Adam Taylor, the wood-products extension specialist at the University of Tennessee, responds: The short answer is yes, micronized-copper treated wood can be used in load-bearing and ground-contact applications. However, a little more background information might be helpful.Treated lumber is widely used for decking and other exposed woodwork. The treatment process...

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