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Old 16th May 2008, 03:37 PM   #2
Ethan Winer
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Join Date: Oct 2002
Location: New Milford, CT, USA
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For large cavities between walls the best material is also the cheapest: plain pink (or yellow) fluffy fiberglass. Fill the gap, but don't pack the fiberglass too tightly. Just enough thickness to fill the gap.

--Ethan
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