Quote Originally Posted by Jamie Buxton View Post
JR, I’ve not seen that material. The stuff I’ve seen is the next to the left in your pic: lumber core and thick faces. How does the single ply behave? Does it cup across the grain? Does it expand and contract across the grain like wood lumber does?
It acts similarly to the 3-ply sheets. It actually seems to bow along the grain rather than cup across it if it is going to move, iirc. Controlling moisture absorption/loss is the key to keeping both types flat. I haven't done much with it - a few jobs making shaker style doors using strips of the 3/4" for the rails and styles.