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Question DetailsAsked on 8/25/2013

do I need moisture barrier on a concrete slab? Is dricore a good product to use? This is not a basement.

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If you are putting something over the concrete slab, unless it is quite dry (can be tested with moisture meter) year round, then yes. If it is quite dry then a concrete sealer or water-resistant floor paint and a permeable pad and carpet will sometimes work (that is what I have), but generally you do need a edge-sealed positive vapor barrier under any type of flooring you put down - the problem is,you generally do not know in advance whether you are going to have vapor coming up, unless the house was built with an under-slab vapor barrier, which all new houses should be but most are not. So - spend the $0.10/SF or so for a vapor barrier under your flooring unless you are going with a bare concrete floor just with epoxy coating, floor paint, or a polished or ground sealed concrete floor, or tile or stone mudded to the concrete, ,which is permeable enough to not cause problems as long as you do not have actual water coming up through the slab, rather than just vapor.

DriCore subfloor is a variation on the old-time system of using lathe or batts to create an airspace under playwood or hardwood floors, and probalby works about as good - not worth a dang. The problem is, they promote the gap under the floor allowing moisture to escape - the question is to where ? They have a 1/4" gap around the edge of the floor, an impervious membrane on the bottom of OSB or particle board, and expect that to stop moisture problems ? I don't believe it - for that to work you would need a fan system to move the air under the floor - it is not going to have any measureable airflow, and with an impervious layer above and no airflow, their system is no different than a layer of visquen under subflooring.

Answered 6 years ago by LCD

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