scope:

This Standard provides a method for third-party agencies to evaluate inspection data based on average percent core failures for penetration data and a 95% confidence interval of the mean for retention data. It is applicable to preservative pressure treated sawn lumber, sawn timbers, and engineered wood products. It provides requirements for increased inspection, warning and disqualification when conformance fails to meet specified levels. This evaluation method does not modify or change any current penetration or retention requirement in the AWPA Standards.