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I am about to rip out a tile floor in my kitchen and I will be replacing with 3/4” x 4” T&G red oak planks to match the surrounding areas. Do you guys use rosin paper or some other type of underlayment b/w the subfloor and new oak flooring? Lumber liquidators was trying to sell me some sound absorbing underlayment. Sound is somewhat of an issue in the building (condo).

Thanks guys.


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What are the humidity levels in the space below? If it's high, you may want a vapor retarder like 15 or 30# felt paper. The rosin paper does help the floor boards come together tighter, but does little to retard vapor. Maybe that's all you need.
As far as sound barrier underlay, seams fishy to me, something thin, pressed tight, is going to do little for sound control. IMHO


More important is what are you nailing the hardwood to?
 

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There are sound deadening underlayments that are legitimate so you might consider going with one. Otherwise, I always use 30 pound roofing felt. It is thick enough to pad the irregularities in the floor and provides moisture protection as well.
 
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