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I have a 4″ Slab on grade with radint heat(PEX) over foam board and a good poly vapor barrier. I want to lay down 3/4″ ply and then 3/4″ hardwood. I want to separate the ply from the concrete but can’t use felt or rosin paper because of the radiant. I could put down another layer of poly. Is a double vapor barrier in this situation a bad thing? Are there any alternatives? What about thinset under the ply – bad idea?
Also, should interior walls be laid on the slab or the ply? It would be easier to run all the ply first.
TIA, Jerry
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Check out http://www.jlconline.com/jlc/archive/energy/radiant_sept99/index.html. It's a link someone else mentioned in another thread and it should answer many questions.
My guess on the plywood question (just a guess--hopefully a pro will confirm or rebut) is that your plywood would go first and then your interior walls. ReasoningÑif you frame the floor, you'd lay the plywood on the joists before building the interior walls, so this is essentially the same thing, except over concrete rather than joists.
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I have a 4" Slab on grade with radint heat(PEX) over foam board and a good poly vapor barrier. I want to lay down 3/4" ply and then 3/4" hardwood. I want to separate the ply from the concrete but can't use felt or rosin paper because of the radiant. I could put down another layer of poly. Is a double vapor barrier in this situation a bad thing? Are there any alternatives? What about thinset under the ply - bad idea?
Also, should interior walls be laid on the slab or the ply? It would be easier to run all the ply first.
TIA, Jerry