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American Wood Council

What is the best way to deal with the exposed ends of unpreserved wood when pressure treated wood is cut?

Field applied treatments are available to treat cut ends. The American Wood Protection Association (AWPA) states:

“…Drilled holes and cut ends need to be treated with a preservative, such as copper naphthenate or oxine copper (mostly for exterior use) or a boron-based preservative (for interior uses only).  Copper naphthenate specified in AWPA Standard M4 for field treatment contains 2% copper and is sometimes available in paint, hardware, or building supply stores…"

The following FAQ is based on the presentation of DES140 – Structural Condition Assessment of in-Service Wood.

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