gunrunnerjohn posted:This is 23 x 13, 1/2" multi-ply and topped with 1/2" Homasote, everything was butted as close as possible. It's all fastened down with around 5,000 staples in the ply, and around 700 drywall screws in the Homasote. I seriously doubt it's going to have any expansion issues.
If it does, you're going to end up with a bigger room !