Lumber comes in all types of shapes, sizes, dimension, etc. The use is sp
ecific for each style of lumber being used. There is Doug Fir which is lumber that is cut from the trees & basically it is still "wet" due to there
being some moisture still in the wood. This type of wood is primarily used for framing, studding a wall, fire blocking, etc. The other style of wood is Kiln dried which means it is like Doug Fir but it is dried out at the mill to minimize shrinking or any moisture causing movement when in place. The other is Pressure treated wood which is dipped or coated to preserve the wood in the exterior applications of it. Usually used for decking or wet conditions when used for framing.