WDMA T.M. 1-94(06) Test Method to Determine Preservative Effectiveness in Preventing Wood Decay evaluates the relative wood preservative effectiveness by means of a laboratory soil block culture. Results of this test are used to recognize commercial millwork preservatives as meeting the requirements of WDMA I.S.4 Water Repellent Preservative Treatment for Millwork. This standard was reaffirmed in 2006.
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