How and What to Specify in the Preservative Treatment of Wood for Buildings

Preservatives for wood can be divided into three categories: l) Creosote and solutions of it, 2) oil-borne preservatives such as pentachlorophenol, and 3) water-borne preservatives such as copper chrome arsenate (CCA). The major specification writing bodies for some preservatives and treated wood are the American Wood Preservers’ Association and the Federal Supply Service. Besides the kind of preservative, the depth to which it penetrates the wood and the amount to be retained by the wood should be specified. Units such as foundation piling should be treated with oil-borne or creosote preservatives to a retention of 12 pounds per cubic foot while structural units exposed in a less hazardous area can be treated with water-borne preservatives.

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