A Climate Index for Estimating Potential for Decay in Wood Structures Above Ground

A formula, based on standard U.S. Weather Bureau summaries, was developed to yield an index of the relative potential of a climate to promote decay of off-the-ground wood structures. Experimental support for the variously derived indices was based on correlation between amount of decay at three representative exposure sites, and the index calculated for the sites. Experiments consisted of testing on-site preservative treatments for protecting exterior building components. Exposure units were of two types: A common joint-type structure simulating the juncture of a post and rail, and a panel of conventional flooring boards. The units were exposed in western Oregon, southern Wisconsin, and in southern Mississippi. Distribution of climate indices is shown by regions on a contour map of the United States. The quantitative measure of decay potential is necessary to estimate needs for protective measures, especially preservative treatments. Possible adaptation of the formula to meet conditions of wood in contact with the ground is considered.

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