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John Gilmer John Gilmer is offline
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Default Leveling OSB Flooring for Hardwood Install

A 1/4" sag is quite a bit.

That's almost to the point where many folks would consider tearing it up and
replacing it with "real" plywood.

If you are trying to do it on the cheap, you CAN "seal" the OSB. "Sanding
sealer" might work. Insofar as the OSB is porous, the sanding sealer would
penetrate. I have become a fan of sealers/primers that use denatured
alcohol as a solvent: they make a good base, clean up is easy, and they DO
penetrate.

Using denatured alcohol as a solvent makes it dry quickly. And then you
slap on your portland cement based leveling compound. The sealer will keep
the water away from the OSB until the compound sets and the water is gone.


"Otoe" wrote in message
...
After removing carpeting in the family room to replace with hardwood
flooring, the OSB has sagging between the joists. The sagging is
around 1/4" to 3/8" worst case. The hardwood installer said he
can't warranty the install because of the floor not being level.

Leveling compound specifies not to use on OSB. Can the OSB
be sealed to use leveling compound?

Is there some other alternative? Replacing the OSB with
plywood would be a major effort as the OSB is screwed
and glued to the joists.

Appreciate your advice,

Otoe



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