Would think either would be fine. Just look at floor levels between rooms?
Yeah other boards are about 20mm pine so hoped 18 would be ok in ply. Can’t get over how expensive plywood is these days though!
are you putting something on top of it and/or is there a reason you couldn’t use OSB as a cheaper alternative?
@andos started
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Would think either would be fine. Just look at floor levels between rooms?