need a subfloor?

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Old 05-11-02, 04:05 AM
stephaniec617
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Question need a subfloor?

Getting ready to install wood flooring on a concrete slab . . . plan to seal concrete first but do we need to use a subfloor over the concrete or can we install directly?

If there are slight uneven places on the slab - will a subfloor of plywood level it out?

Lastly, do we need additional adhesive besides what comes on the self-stick floors?

Thanks!
 
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Old 05-11-02, 07:02 PM
sdharlow
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I take it, the wood floor you are talking about is one of these rather thin, self adhesive, possibly tounge and groove type of floors. If this is the case, your best bet will probably be to install a 5/8" underlayment board then apply your flooring to that. You may want to apply a vapor barrier such as 4 mil poly over the slab prior to the underlayment. Is this a basement? Have you checked for moisture problems? As far as the adhesive goes, it has been my experience so far that the factory applied adhesives are not near as durable as feild applied adhesive. I would recommend using a wood floor adhesive, but carefully read your material information first to make sure there is no directions gaurding against it.
 
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Old 05-18-02, 02:30 PM
T
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Installing wood floors on concrete

Solid hardwood is not recommended for installation on concrete below grade such as in a basement. If you are installing solid hardwood, go to http://www.installingwoodfloors.com/ for helpful info. A 3/4" exterior grade plywood subfloor should be installed over a moisture retarder if installing above grade.

If you are installing an engineered wood product, each manufacturer tends to have its own surface prep and installation instructions to maintain product warranties.

Dips in concrete can be leveled out with a self-leveling compound.
Go to http://www.ardex.com/intro.htm to learn about self-leveling compounds. Click the "Site Map." You should be able to find self-leveling compounds at a local home center.
 
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