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Old 02-09-2012, 09:04 AM   #21
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Originally Posted by Dgc333 View Post
Butyl rubber by it self is not as dense as Dynamat meaning it has something else in the make-up. When I was researching sound deadener for my Barracuda I read a number of comparison articles and saw a number of references that these materials used asphalt to give them the density. These articles also said that the ice dam membrane was very effective.

In any case Dynamat if not the most expensive it is close, even the cheapest stuff is still about 3x or more, more expensive than the ice dam membrane material.
Butyl rubber based deadeners with foil backing dont get hard like asphalt foss over time

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