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I recently added Dynamat sound deadening to the roof of my car. I was not able to find much detailed information on how to do this so I thought I would post my experience and results.

First I pulled down the roof upholstery and its foam backing. This was a very messy process, as the foam backing crumbled and created a large amount of dust. I covered the entire underside of the roof with Dynamat, cut to shape. Dynamat is a tar based mass-damper with a foil backing; its uneven surface and seams make it unsuitable to adhere the vinyl headliner to, directly. Next I shaped a thin sheet of Coraplast, purchased from a local sign shop, to fit in the roof using the vinyl liner as a template. I thoroughly washed the headliner on both sides, scrubbing off the old foam backing remnants. I was able to tuck the Coraplast into both the left and right sills, above the doors.

Once I was satisfied with the fit of the Coraplast, I took it down and sprayed it with 3M vinyl adhesive and placed the headliner carefully. Next, I sprayed the underside of the roof with the adhesive and quickly assembled the Coraplast headliner and side sills in place.

The result is a very smooth and stock appearance. It maintains the original bowed shape of the roof and does not vibrate or oil-can. I did lose some small amount of headroom due to the added thickness of the Dynamat and Coraplast-- perhaps as much as 1/4" compared to stock. Importantly, it eliminates the roof as a source of tinny noise, increasing sound quality. Below is a picture of the final result.

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ZR1,

I have only driven my car with the sound deadening in place, but I have ridden and driven in other Panteras. There is a noticeable difference in the lack of high tones coming into the cabin. My car has a big block with open exhaust, but I only get deep bass notes from the engine. When you knock on the roof with your knuckles it sounds completely dead.

I have also applied Dynamat to the doors, firewall, floors, etc. It is like being in a bank vault.

Sincerely,

Matt
Nice job there. Dynamatted mine couple years ago, made a tremendous difference (and a huge fan out of me). Doors thunk shut, firewall noise reduced, overall more 'solid' feeling.

The roof...

Mine was originally just stuck to the roof, then headliner reinstalled. Worked great... until it was about 95 in Alabama heat and the thing drooped mightily. Plan B.

Adhered the Dynamat to some foam-core, then the headliner to that. A very good look, but NOT as smooth as the Coraplast. Wish I'd seen this first!

The thing is, make sure your headliner is totally clean of the awful foam dust before attempting to stick it to anything.

Great job!
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