28 Dec '12, 10pm

Moisture Barrier #green

Philip, First of all, a basement slab should always have a layer of polyethylene underneath it, whether or not there is also rigid foam. I hope your slab has a poly vapor barrier underneath it. If for some reason your contractor forgot to install the poly vapor barrier, that's unfortunate. However, the rigid foam will act as a capillary break and a vapor barrier, even without the polyethylene, as long as you don't have a high water table. Before you install the flooring, tape a square of clear polyethylene on the bare concrete floor and leave it there for 24 hours. Then inspect the poly to see if there are any water drops under the poly. If there are, that's a bad sign, and you should consult the manufacturer of the flooring before proceeding. In any case, be sure to follow the directions provided by the manufacturer of the flooring product you want to install. If your sla...

Full article: http://www.greenbuildingadvisor.com/community/forum/green...

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