Flooring and a new slab on grade
I have a few questions about installing flooring on a good, new slab on grade. The planned slab construction is 6″ of washed crushed stone with drainage pipe, 4″ of EPS, 10 mil poly, and then 4″ of concrete. The slab is for a planned house near Rochester NY, zone 5A, at the top of a small hill in a field of silty loam. The drainage is naturally away from the homesite, and will be further improved as necessary.
1. When installing wood flooring over a slab like this, should I install a second vapor barrier above the slab? I would expect this slab to be room temperature and relatively dry (once cured). I’m concerned that a topside vapor barrier could cause a mold issue if it ends ups trapping moisture from construction or an accident.
2. My wife would like soft, squishy-underfoot carpet in the bedrooms. Can I achieve this without inviting mold and air quality issues?
3. What’s the best way to eliminate the height transition between floor materials of different heights? Put a step in the concrete, or build up the floor with some other material? The extra concrete’s not that expensive, but it’s not a very green material.
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