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rowood
 Post subject: subfloor over concrete
PostPosted: Mon Mar 07, 2011 12:05 pm 
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what is the righ way to and install plywood over concrete for hardwood floor installation
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greenfloorgoddess
 Post subject: Re: subfloor over concrete
PostPosted: Fri Apr 22, 2011 10:06 pm 
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Joined: Mon Feb 07, 2011 9:52 am
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Location: S.E. Michigan, USA
Install a floating sub-floor by screwing together two layers of plywood.
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JamesTRD
 Post subject: Re: subfloor over concrete
PostPosted: Sat Apr 23, 2011 12:56 pm 
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Joined: Mon Mar 14, 2011 4:36 pm
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6 mil polyethylene plastic,

then plywood( preferred underlayment) shot into slab

install sheets opposite to the preferred floor direction..

cover with felt or the like and install flooring with 11/2" nails/staples
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JamesTRD
 Post subject: Re: subfloor over concrete
PostPosted: Sat Apr 23, 2011 12:57 pm 
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forgot...leave spacing between sheets..thickness of a nail good
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Mickey
 Post subject: Re: subfloor over concrete
PostPosted: Sat Apr 23, 2011 3:23 pm 
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Location: Great Falls, MT
Go with the 6 mil poly and then use the two layers of plywood. No sense putting a moisture barrier down then shooting it full of holes IMO.
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floormeintucson
 Post subject: Re: subfloor over concrete
PostPosted: Sat Apr 23, 2011 9:30 pm 
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Joined: Sat May 02, 2009 3:45 pm
Posts: 3357
Location: Tucson AZ
Go with a trowel on vapor retarder, either roofing mastic and 6 mil or Bostik MVP4 and 6 mil then float the ply. I agree with Mickey, less holes less potential for failure.

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Stephen Perrera
Top Floor Installation Co.
Tucson, Arizona
IFCII Certified Inspector
Floor Repairs and Installation in Tucson, Az
http://www.tucsonazflooring.com

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soapte12@yahoo.com
 Post subject: Re: subfloor over concrete
PostPosted: Fri Jun 03, 2011 10:01 am 
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You can glue 1/2'' to 3/4'' thick strips of wood straight to the concrete and then install your wood floor on top of that.
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