Under layer needed in hardwood floor install on second floor ?

Sharon Verash
by Sharon Verash
we are having 3/4" x 2 1/4" hardwood flooring installed on second floor to replace carpeting.
should we have under layer placed for sound barrier/insulation improvement instead of just the paper usually used. the flooring will be nailed. unsure if extra cost is worth the results. any thoughts ? suggestions ? thank you
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