White mold or fungus on PT lumber

Question

I'm building a wooden fence and have a number of 4x4 pressure treated lumber stacked neatly in my garage. I've been pulling posts from the stack as I work on the fence over the last 4 weeks. When I removed a post today, I noticed a white fungus or mold growing on the posts in the center of the stack. I didn't get a picture of it, but just scraped it off and sprayed the affected areas with a 10% bleach solution.
Now that I'm thinking about it I'm concerned the posts may be defective. Should pressure treated lumber support fungus or mold growth?

George Anderson · Answer

Most building wood, esp. PT which usually has a very high moisture content should be stacked with stickers between the boards vertically and a half inch - inch or so between them horizontally to allow for air flow. Also best to store high moisture content wood outside, but covered only on top (like a wood shed). (posted as an answer at the request of the OP).

Answered by George Anderson on March 13, 2021

White mold or fungus on PT lumber

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