What type of subflooring should I use for finishing off an attic? My first thought was plywood, but the Home Depot rep suggested I could save money by going with particle board. The savings could be significant, but I'm a bit concerned about the longevity, plus the extra weight (it's my back I'm thinking about, not the floor joists). And can I get by with the same dimensions?
The attic will be about 550 square feet, carpeting throughout except for a full bath that will likely be ceramic tile.
I've always been a believer in a 3/4" plywood underlayment subfloor with 1/2" partical board on top. OSB is so rough that it shortens the life span of your carpet padding. Substitute 1/2" Durock for the ceramic tile area for a really great floor. I'm sure you'll get a lot of options from a lot of people but I've found that this works well. Whatever you decide, screwed and glued always works best. Mike