oak flooring

mazey

got a cape cod in upstate ny , 1949, original oak floors, refinished upstairs bedroom last spring and turned out good. had to patch a few boards and underneath was some kraft paper underlayment, just seemed like old-dried up paper. just repaired 150 sq. ft. of same oak in living room and it was installed originally right on top of plywood- no paper. so i nailed down my replacement sections right on top of plywood -turned out great.no squeeks/noise. now im adding new oak to kitchen, on top of ply sub floor. should i bother with the paper underlayment? what is the reason for it anyway? if it matters i have hot water in floor radiant heat installed under sub floor. thanks

Millertyme

rosin paper is used to help slow down the passage of moisture into the floor.

mazey

any reason they didnt put it in the 1st level of house even though its in the upstairs?