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I bought some treated 2x4's from Lowes, and it was fairly wet and heavy. I went ahead and built a firewood rack, but screwing into it releases a lot of water. It got me thinking, is it better to let the wood dry out a while before building with it?

This project is done, but if I was going to use treated wood in the future, should I buy some ahead of time and let is sit outside for a few weeks?

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On a side note. Always use coated, or stainless steel fasteners when working with pressure treated lumber. –  Tester101 Jan 25 '13 at 14:06
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Unless you have a kiln to dry wood in, drying wood in a standard environment takes a really long time (if you buy firewood, usually you want ~2yr old wood!). I don't know that leaving it out for a couple weeks would dry it if it were so saturated that there is visible water coming out of it. It is recommended to let wood used for hardwoods sit a couple weeks to get accustomed to the environment as far as humidity goes, but it is not being dried any further.

I would recommend that you find a better source of wood that is dried properly. You also want to carefully select your wood, it might be that you just got a bad piece some how.

For outdoor projects, instead of PT lumber you might opt to try a wood like cedar which naturally resists the elements pretty well.

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Redwood is also decay resistant, but if you care about American forests, avoid buying it unless you can verify it was sustainably grown and harvested. I'm not trying to tell anyone what to do, just pointing out there is an issue. Do what you want as long as it is an informed decision. –  bcworkz Jan 26 '13 at 0:52
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