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Titan Wood Limited’s Accoya pine lumber has been treated with a concentrated form of vinegar in a process called acetylation. According to the manufacturer, this modifies the chemical composition of the wood without adding toxins, making it inedible to insects and rot-causing microorganisms. The company also says the treated wood resists moisture and lasts 50 years or more in exterior applications. For decks, 1 1/4-inch-by-6-inch boards are available in lengths up to 16 feet at a cost of $6 to $7 per board foot. Titan, 972/233-6565, accoya.com.

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