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For the first time in 12 years I have to have hardwood frooring installed over both 3/4″ plywood and an ajoining
concrete floor without radiant heat. Since the project hasn’t started yet, I’m up for suggestions. My hardwood flooring sub said to have the concrete 3/4″ lower then the plywood and then nail and glue 3/4″ ply directly on the concrete to match heights. Then he will just nail the 3/4″ hardwood as usual. The concrete is above grade.
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For the first time in 12 years I have to have hardwood frooring installed over both 3/4" plywood and an ajoining
concrete floor without radiant heat. Since the project hasn't started yet, I'm up for suggestions. My hardwood flooring sub said to have the concrete 3/4" lower then the plywood and then nail and glue 3/4" ply directly on the concrete to match heights. Then he will just nail the 3/4" hardwood as usual. The concrete is above grade.
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If that concrete is in contact with dirt it will wick moisture and you will have perpetual problems. There is no way to keep that moisture out of the backside of the flooring. If the slab is on a framed floor it will work just fine. Lee