2x4s you will find at HomoDepot and Lowes ect, are graded #2+btr , which means its at least a #2 piece of wood, maybe better. Big mills do not make 1x2 and 1x3 ect. That is produced by smaller reman centers ( like mine) , you take #3 and sometimes #4 , 2x3's and 2x4s and mill them out . Thats why you get 5/8, 11/16 instead of 3/4 occasionally . Saw kerf loss. You will also see premium 1x2 and 1x3 , which may mean it was cut from better material (or not). Faster reman centers will also buy in partially air dried or surface dry and mill it into strapping , but now you have exposed the wet core and there comes the warp.
Lord help the guy that buys 2x4 econos and frames his basement , as hundreds do, they will shrink and twist and pop the drywall screws out.
Lord help the guy that buys 2x4 econos and frames his basement , as hundreds do, they will shrink and twist and pop the drywall screws out.