I find that a lot of the pressure-treated 4x4s and 6x6s I use twist badly after installation as they dry. It’s not a structural problem, but it looks terrible. Is there any way to recognize pieces that are likely to twist so they can be culled before the problem comes up?

A. Alexander Schreyer, a structural engineer and lecturer in wood technology at the University of Massachusetts Amherst, responds: The twist you’re seeing has two main causes. First, PT lumber contains a lot of water from the treatment process that needs to dry out. Second, the larger-sectioned square members are typically cut from the center of...

or Register to read the full article.