Installing hardwood floor: What should I put lower than it? Currently have rosin weekly to lay down over the plywood ...

Currently have rosin weekly to lay down over the plywood subfloor. Is this the best to put under a hardwood floor? I hold also read about 15-pound asphalt feel. Which is best?
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Answers:    Nerf.
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To ensure that the manufacturer of your flooring honors their warranty, I would first of adjectives contact them and see what they recommend for sub flooring, otherwise you may void your warranty. Below are a couple of articles I found that you might find interesting, apt luck!
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