Submitted by CaseOfBeer t3_ywf0ab in DIY
Reelplayer t1_iwjbafj wrote
What's under the floor? Tongue and groove, with a bead of adhesive along the groove, becomes a moisture barrier. That's good if you're above a crawl space or other area with moisture. Tongue and groove also supports more weight along the seams. Finally, tongue and groove won't grind its edges into sawdust over the years, opening gaps in the seams and causing noises. So you have to decide if these things are important to you.
CaseOfBeer OP t1_iwjg5ia wrote
Yes, great question. It was originally a crawl space, but now there is a full basement underneath.
Its possible I wasn't clear enough in the OP. The question is regarding adding another layer of OSB over the existing OSB subfloor.
Reelplayer t1_iwjm3fi wrote
My mistake. No need for tongue and groove then.
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