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Re: Pressure Treated Wood

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The '97 UBC (Chapter 23) references AWPA for preservative treatments.  AWPA
standards cover two levels of preservative treatment - "above ground" and
"ground contact".  I believe CCA (chromated copper arsenate) is the most
common preservative used, with retention rates of 0.25 and 0.40 for above
ground/ground contact, respectively.  Retention rates vary with preservative
type.  Different preservatives have different precautions or limitations in
where they should be used.