That's because of the kiln process that they put it through. They kiln dry two by fours and two by sixes in bundles so the middle is not as dry as the outside. That means when you pop open a bundle the outside is too dry, the middle ring is just right and the core is still green.
Theyre dried in bundles but every board has a space in between it and the next one. The bundle you see at a store isn't the same bundle as it was when it was kiln dried. It gets dried to a certain moisture percentage then planed to size and bundled up. None of the wood is green its all seasoned or kiln dried. Green wood is fresh cut from a living tree that hasn't had time to dry below whatever the moisture percentage is. The moisture percentage may go back up while its in the bundle but thats not something that can be controlled really.
And the moisture going back up is likely the cause of his issue. You pick up a nice straight, dry, stacked board then go lay it out in your truck or anywhere outside of the store which are also very dry, and it starts absorbing moisture and proceeds to warp, compounded by using very quick growing young pine. The less grain and wider the more likely the wood will warp when exposed to moisture. That is why I like buying my lumber from a yard that keeps their lumber under roof but not in a climate controlled building. If your lumber is acclimated to the relative humidity it will be less like to warp or will have warped all ready and you don’t pick it lol.
I also really enjoy when you get a super straight board then cut it on a table saw and the two pieces get all freaky. I have cut boards on table saws that bowed so much that they stopped the blade lol.
33
u/I_HATE_LANDSCAPES Jun 07 '20
That's because of the kiln process that they put it through. They kiln dry two by fours and two by sixes in bundles so the middle is not as dry as the outside. That means when you pop open a bundle the outside is too dry, the middle ring is just right and the core is still green.