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intensely_human ,

I’ve never known wood to shrink

username_unavailable ,

There’s lot’s of people learning in this thread.

Untreated lumber will soak up water and swell, the dry in the sun and shrink. This process will allow natural twists to reassert themselves and stress and strain will warp into the wood.

nottelling OP ,

Right, so how do you account for that in the design? In my photo, I didn’t account for it at all. The square cuts have changed and it’s failing. I can resolve it with braces as suggested, but now I’m wondering if those braces will change and it’ll go out of square again.

nowwhatnapster ,

Or in the case OP, they bought pressure treated wood which is literally injected with moisture (chemicals) to prevent decay. If you ever picked up a piece of fresh PT lumber it is HEAVY from all the moisture. Best to let it dry a couple weeks before working with it.

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