Sound Insulation

[BBPanel]

I used Dynamat Extreme which works awesome, but the cherry on top is adding a layer of 1/4" Dynaliner on top of the Dynamat Extreme. I can tell you, in my experience, adding the Dynaliner made as much or more difference in the sound deadening as it did with just the Dynamat. The two work well together as the Extreme blocks heat and takes out the "tinny" sound while the Dynaliner further knocks down the noise and adds very little weight in the process. Good luck!

I like the idea of the 2 in 1 stuff like Membrane because of ease of installation and its both butyl and foam. But if one uses 2 separate layers it appears there is either closed cell foam or fiber matting. I like the fiber because it looks more substantial, most seem to have a foil cover but I'm not sure its waterproof and also requires spray adhesive. The foam is waterproof, without a foil cover (like dynaliner) but is self-adhesive. I'm guessing both have "required" fire ratings.

For those of you that have used both foam and fiber which type do you prefer?