What's the difference? I see plywood available specified as either sheathing, subfloor or underlayment. But other than thickness, I don't see a difference. And even then, some thicknesses overlap in the categories.
What he said, but to be less specific........sheathing and subfloor are generally the same stuff, CDX(1 side C/1 side D/exterior grade glue). OSB is more common now than plywood, less expensive. Subflooring is usually T&G, sheathing is not. Underlayment bridges the large imperfections of subflooring, as a prep for finish flooring.
so underlayment would typically be the thinner stuff?
i asked in another thread about laying hardwood flooring parallel to plank t&g subflooring (although that makes it perpendicular to joists), and was told I need at least an additional 1/2" subfloor. So I went to HD and they had the 3 types of plywood. not sure which to use. Almost sounds like underlayment is what I need since the existing plank is the true structural support...
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