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Plywood on concrete

jel111's Avatar

Join Date: Nov 2007
Posts: 25

05-30-08, 11:22 AM   #1  
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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OhioDraft's Avatar

Join Date: Oct 2007
Posts: 157

05-30-08, 11:34 AM   #2  
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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