*
Gonna bounce.
Discussion Forum
Discussion Forum
Up Next
Video Shorts
Featured Story
Traditional lime wash still has tons of useful applications.
Highlights
"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.
Replies
*
Can I use 3/4" CDX for subfloor? My
joists are 2X8 on 24" centers. I don't want to use thick T&G ply or OSB if I don't have to.
*Yes, assuming the joists are sized correctly. 3/4" cdx is ok. We always use 3/4" cdx T&G , P&TS (Plugged & Touch sanded), glued and nailed for subfloor, wether 16" or 24", so we have a nailbase for almost anything. If you use square edge CDX you run the risk of deflection from sheet to sheet bwetween the joists, so we prefer the T&G.
*If you use CDX you have to plan on using some type underlayment under carpet, don't you? I always thought that was the reason for using the p+ts grade Mike mentioned, you can carpet right over it. The other thing about CDX is you would have to block all unsupported joints. When you factor in materials and labor, you won't save much using square edged CDX. I don't know what your spans are, but your joist system sounds marginal. With 2X joists 24"o.c. I think you need 1+1/8" sheething, don't you? - jb
*Gonna bounce.
*Can't think of too many occasions to be using a 2x8 on a floor system (except for a VERY small floor) plus the 24" centers.... Bite the bullet and go for something a little stouter. Sam
*You don't say what this floor is in,I'll assume a house.CAN you use 3/4"CDX? Yes, but you will need to use something for underlayment when putting down the finish floor. Why not do it right and use 3/4" T&G AC? Even then you might get some bounce. If that is ok, fine. If not either reduce spacing or make the plywood thicker. For me I'd reduce spacing.As for the joists, you don't give a span so I assume you have calculated this not only for strength, but for bounce.