A decay field test method, which has been recently proposed for the standardization by the AWPA, is described for evaluating the relative performance of wood samples in a severe above ground situation exposed to the weather. Data is presented on the relative performance of untreated control samples and standard preservative systems exposed at the same site at different time periods, or at different test sites with the same test materials using this test methodology. Comparison data including this method with other standardized test methods is also included. The experimental data collected during last 13 years show that the method provides a viable and consistent methodology for generating results representing the worst above ground exposed situation that might be encountered during service.

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