underlayment for 3/4" nail down oak flooring

Old 07-23-14, 08:53 PM
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underlayment for 3/4" nail down oak flooring

Gonna be nailing down 3/4" solid oak flooring over plywood subfloor. I know typical underlayment is 15# roofing felt but I live in a condo and I need a soundproofing underlayment. From what I've read so far in other posts, it seems cork is the best, but I haven't seen how thick the cork should be. Can anyone give a recommendation on how thick cork should be, do I still need a vapor barrier? If so, where does it go, above or below the cork? Or is there a better product? Thanks for any help you can provide.
Old 07-24-14, 05:03 AM
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Welcome to the forums! Cork would act as a vapor barrier, BUT, I doubt the expense would justify the lackluster noise reduction it would provide. It will be better than felt, but only marginally. Hardwood flooring will transmit more noise than carpet, that is a given. Cork is recommended for laminate and engineered floating floors, but not sure about staple/cleat installatons.

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