Is it safe
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Can you use rhino roof paper on bathroom floor under tongue and groove hardwood floors
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Sure, provided there is not a crawlspace or undoncotioned basement underneath it. Most roofing underlayments are vapor barriers and it could become a condensing surface if there is a big moisture source bellow.
I used a similar product under the flooring of my place. Cheap, easy to walk on and the nail markings on it make running pex loops much easier.