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andos-
Wouldn't you still want to waterproof a ply floor if your that worried unless you're using marine ply? If which case maybe use OSB, then apply a liquid membrane (like they use on flat roofs-nasty stuff but effective) then the cork or whatever over that. The guys that did our bathroom did this and then tiled over it (although that is a wet room in particular)
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Don't people normally lay this sort of thing if you're doing flooring from scratch?
jeff80
hugo7
are you putting something on top of it and/or is there a reason you couldn’t use OSB as a cheaper alternative?