So I have a green salt treated warped 2 x 6 x 8'. It's the worse warped twisted piece of lumber I've ever had. I've had it for almost 4 months in my garage thinking out of the elements would keep it nice and straight. When I called the lumber yard to see if I could swap out... "no" was the answer.

Anyways I was told that green treated lumber should be stored outside under the elements. That once it's left to dry out completely it will warp and rewetting it won't work to straighten it back out again.

Is this true? Any tips?

Don't know about already milled 2x6 but slabbed green wood is stored "stickered", outside, weighted and often in an open shed or covered on top with something to keep some of the elements off. I would imagine the same would be true for the 2x material.

Agree about rewetting will not bring it back to straight

Thanks lew. Just for fun and giggles, between yesterday and today I poured water over it on all sides and just layed it on my back yard deck. It is straightening out but don't know if it will stay that way. I will be stickering it and leaving it outside under cover. Thanks for your input.

When I built our deck, I used treated lumber (about 25 years ago). There were different opinions on the construction techniques. One was to space the deck boards about .125" apart, the other was to butt their edges tightly together. I went with the tightly butted design and glad I did. The boards shrunk (across the width) from .125" to .25"! If I had added the spacing there would have been unsightly gaps. Point is, wet boards are going to change shapes/dimensions and the best we can do is try to minimize the changes and plan for them.

Good advice lew! Wood is an ever flexing medium. As woodworkers we must not forget this.

IF you have a way to weight it down that might take a little of the warp out, but would take a while. Also if the whole board is not critical to a project nail it down and wait. Unlikely that these will work but you got nothing to lose. One more option is to rip the board also depends on if you need the full width.

PT lumber is wet through and through usually. I think the idea is that once it is bolted to some foundation and has a house on top of it, the boards will dry out pretty straight. Honestly, I hate the stuff, but sometimes you have to use it. I look for stuff that feels dry to the touch and is still fairly straight. I think if it sits long enough bound up in a unit of lumber, there is some non zero chance of it drying out straight.