Re: why use foam?
It is more of a question of when and where to use each product.
Deadener helps with panels resonating.
Foam helps with decoupling.
MLV helps with blocking noise.
Butyl Rope helps with panels rattling against braces.
Expanding Foam helps fill large voids.
1/8 or 1/4" Plywood helps stiffen large flat panels that don't have good enough braces. (bonded with PL Premium)
Use the right tool for the right job. Sometimes it means the use of multiple tools to get the job done right.
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