Factory insulation vs. Dynamat, etc.

halifaxhops said

I have been using this available at Home Depot in the roofing area. Sticky as hell, way lower price than dyna mat and it is in a roll for long strips. Works fantastic for sound deadening. I have it on the floor of my dart and all over a pickup cab, works great, no smell when it gets hot either. Around 25 for a roll. Not sure how many feet I think 25' x 6"

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I put that exact same stuff over the inside of the roof of my Duster since it has no headliner. Just like Martythetrimmer described it used to make a loud hollow 'boom' sound when tapping on the roof now it's a much quieter 'thunk' sound. The craziest part is how well it insulates heat on hot sunny days, used to be a killer in the summertime now you can sit parked in 90* heat in direct sun and it stays nice and cool inside. No peeling either I made sure the bare surface was clean and applied the sheets with a small paint roller to press it on there tight and work out any air bubbles. Also goes on better the warmer it is outside so the asphalt backing is more pliable and sticky.

I would think a combination of the thin sticky aluminum stuff as the bottom layer then the thicker fiberglass-type insulation on top of that would work best on other parts of the car (floor etc.). I do intend to apply that roofing stuff to sections of the car at a time I think next will be the rear wheelhouses and the panel that goes between the back seat and trunk (mine is missing altogether), then probably the doors since those don't have panels either lol. Either way putting down some Dynamat or whatever kind of sticky aluminum foil stuff will make a big difference.