Darro wrote in message . ..
There's a friendly debate going on in our condominium about the
soundproofing effectiveness of underpadding for laminate and/or
hardwood floors applied on top of existing concrete-over-plywood
subfloors.
[...]

Check out this article (and related ones at the same site):

http://www.fastfloors.com/articles/U...Types_Uses.asp

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Y.