Plywood on concrete


Old 05-30-08, 11:22 AM
Thread Starter
Join Date: Nov 2007
Location: usa
Posts: 25
Plywood on concrete

Hi all I have a garden unit(half below grade) condo with hardwood floors. I have concrete then plywood then black paper then hardwood (oak). Is this standard installing technique. It first warped at seams. I had him replace some and sand other spots. The new stuff warped again so he sanded that and now seems ok. Moisture ? Thanks
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Old 05-30-08, 11:34 AM
OhioDraft's Avatar
Join Date: Oct 2007
Location: SW Ohio
Posts: 157
yea its moisture i.m.o. they should have installed a vapor barrier under the plywood, not a just a vapor retarder (black felt paper), especially if your floors are below grade.

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