>Fiberglass increases the effective "size" by a multiplier of approximately >1.6 so your 6 inch wall "acts" like about a ten inch one. Separate plates >rather than one six inch one isolated from each other. Do it right the >first time! From what I've read, a closed cell foam, mass loaded vinyl, or lead sheeting is more effective than fiberglass. But that's just what I've read. Ron N
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