Replies

1. 
   gdavis62 | Jan 20, 2004 06:48am | #1

   There are glues that are made for this.

   Another idea is to first lay a 3/4" CDX plywood subfloor on the crete, powernail it, then apply your t&g flooring to the CDX with 1-1/2" flooring cleats or flooring staples.

1. 
   naaltai | Jan 21, 2004 03:39am | #2

   Should there be some kind of vapor barrier (e.g., tarpaper) between the concrete and plywood?

1. 
   gdavis62 | Jan 21, 2004 04:29am | #3

   I forgot.  I glued mine down with Bostik's Best urethane, and didn't shoot it, due to having heat in the floor.  The skin of urethane provided my barrier.  In your case, you can lay down poly, or 30# felt.  The penetrations where you will blast through with a Hilti won't amount to much.

2. 
   FastEddie1 | Jan 23, 2004 05:40am | #4

   Is it solid wood or engineered flooring (plywood with a oak veneer face)?  If it's solid wood, you're pretty much confined to a plywood layer under the flooring.

   Whenever you are asked if you can do a job, tell'em "Certainly, I can!"  Then get busy and find out how to do it.  T. Roosevelt

3. 
   JeffBuck | Jan 23, 2004 06:11am | #5

   all above ... and .. depends where this concrete is too ...

   basement floor ... 30th floor of a condo building?

   Maybe Ditch will stop by and set us all straight.

   Jeff

   Buck Construction   Pittsburgh,PA

        Artistry in Carpentry                

4. 
   Mongo | Jan 23, 2004 08:52pm | #6

   Good replies from all...

   ...but remembering that moisture is the enemy...kudos to Jeff.

   If the slab is above grade, or detailed to minimize or eliminate moisture migration through the slab, then you should be okay.

   If you're doing this over a typical slab-on-grade, or in a below-grade basement slab, then I'd advise a little extra prep work.

   For a slab that may have moisture issues, consider troweling on an asphalt-based product over the slab...then bedding a layer of ploy into that. Repeat with a second layer of tar/poly. Then a layer of cdx ply goes over the top layer of poly and is nailed to the slab...followed by another layer od cdx with the seams offset. Then your flooring goes over the cdx.

   Just my opinion.