I am planning to build a swing set for my kids and was going to use PT lumber. I was not too much concerned with the chemical issues because my kids were now old enough. Also, the PT lumbers are cheaper than the other lumbers. Then, a friend of mine told me that PT lumber tended to get warped and twisted, especially outside when it it exposed to the sun. For this reason, he was saying that the PT lumbers would be a unsafe choice for an outdoor playset.
Is it true that the PT lumbers get warped? That was the first time I've heard. Would it be a serious issue?