Hardwood over concrete...


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Old 08-21-00, 12:34 PM
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I'm going to be installing hardwood over concrete floors. In all the research I've done, it seems that a layer of plastic underneath of flooring is recommended, but what is the best subfloor for nailing into? Will a single sheet of plywood be enough? How deeply do nails from a floor nailer actually go? I have installed wd. floor over other wd. floor, but never over concrete. Thanks in advance.
 
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Old 08-21-00, 01:00 PM
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Normally two thicknesses of 1/2" plywood is recommended, laid in opposite directions and screwed/glued together, with the vapor barrier under them both. Hardwood is commonly nailed with 2" nails or staples, put in through the tongue at a 45 degree angle. The vertical distance needed will then be 2/sqrt(2) = 1.41". So if the nail/staple head is 0.41" above the subfloor, you see that it penetrates 1" into the subfloor.

I think you can also use 1.5" nails, but I'd check with my hardwood supplier.
 
 

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