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ou can't blame them for trying. First they told you Douglas fir could be sufficiently protected by "treating to refusal." Then they tried to convince you that high-density incising would help. The fact is that efforts to protect Douglas fir lumber with any CCA pressure treatment practice generally proves unsuccessful. The evidence is notjust visual. Unfortunately, there have been instances of structural failure.* So local and state building officials are on the lookout for insufficiently treated Douglas fir lumber resulting from misinterpretations of the AWPA standards.Wise specifiers and buyers know the answer. It's Chemonite - the only waterbome pressure treatment available to penetrate Douglas fir up to 2.50# pcf to assure structural integnty and compliance with all AWPA standards.