Floor an Attic for Storage
I have a large (400 square foot), 13-foot-high attic that I am turning into a big storage room and occasional workshop (but not a finished living space). About 70% of the attic is already covered with 1/2" plywood, with 2x6 joists, but the floor feels spongy and I'd like to stiffen it up some because I want to use the attic for light storage. I have a neighbor with exactly the same attic, and he used 5/8" particleboard from Lowes to floor his attic, and his floor is very stiff, just like I'd like mine to be. However, I have read a lot of posts that say to stay away from particleboard because it swells up if it gets wet, so I'm wondering what I should use instead. Is there anything as stiff as particleboard, but without the problems? Obviously, I could just pull up all the 1/2" plywood and replace it with 3/4" plywood. I suppose CDX plywood would be standard?