Doesn’t pressure treated wood tend to twist?
Trees grow naturally with a spiral twist to their grain. If you have ever looked closely at a standing dead tree that has lost its bark, the twist is readily noticeable. During the pressure treating process, the lumber has moisture (water and preservative chemicals) added to the point of saturation. This excess water exits the wood cells during the natural drying process. This huge loss of moisture tends to accelerate the natural twisting tendencies of lumber. Most, if not all of this twisting, can be prevented or held in check by using the material as soon as possible after delivery. If the wood is incorporated into a structure (such as a pole building) it helps to prevent it from following its natural twisting tendency by bracing each piece of lumber.
