PT Lumber ...shrink and warp

[pioneergal]

Is there any merit to the idea that PT lumber is a NO NO to use for floor joists due to its moisture content causing it later to warp and shrink?

[JRR]

I think pretreated and untreated wood may be equally suseptible to warpage.  

I find pretreated wood usually more knot-free ... that's a plus.

But often, the lumber yard (especially the smaller businesses) will store pretreated bundles outdoors instead of in a dry area ... that's a minus.  It means that when you buy pretreated from such a yard, you have some careful drying to do on your own.  Put it in direct hot sun and you've got a pretzel.

[PEG688]

pioneergal I didn't mention that but I do know it does .  I try to keep all our PT stock covered with something , building wrap , other lumber,,, anything to keep the sun off it .  in summer . While it's being  stored .     It is so wet that if left in the sun , not covered for hours,, it really ,, the stuff on top,, drys so quickly that it as a one good old lumber yard manager told me once " Nail her down fast so it,,,  Doesn't jump the fence on ya!" Good old  Freddie    If you can get it nailed in place and the decking on it,, it will do OK .    At least that been my experience where in Wa state .   Summer sun is much harder on wood than winter rain.   So in Tex. with the heat / sun I'd keep it covered before use,, maybe even wet it each day , then recover it ,,, and deck over ASAP  once you put it in place .  HTBH  ;)PEG