Rosin or Felt under Hardwood?

Old 05-03-16, 12:44 PM
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Rosin or Felt under Hardwood?

So this appears to be an age old debate, I don't know where it comes from, I don't know why it's even necessary. I am installing birch on the main floor of a house. It's nail down. Someone gave me a roll of rosin paper. Someone else suggested I use felt paper.

Can anyone help me understand the difference, and why one would use one or the other?

Old 05-03-16, 01:27 PM
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I've always seen 15# felt used.
Old 05-03-16, 03:34 PM
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15# felt is usually the product of choice. It is cheaper than rosin paper, too.
Old 05-15-16, 07:21 AM
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The rosin paper won't do anything as far as moisture retardation is concerned. The felt will act as a moisture retarder. There are other products, e.g. Aquabar B which is 2 faced kraft with an asphalt layer in the middle which is a good moisture retarder and nice and clean to work with.

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