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New rules for pressure treated lumber

from Pro Remodeler

In the fall of 2015, the American Wood Protection Association passed a proposal to revise its U1 Standard, which describes use cases for pressure treated lumber at different levels of “retention” — a term used to describe the concentration of chemical preservative used to treat the wood. Most builders and remodelers use pressure treated lumber to build exterior decks, and the AWPA standard effectively matches retention to where in the structure the wood is used. more

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