My Demon is back from paint, working on the assembly process.
I’m restoring the car mostly stock body/interior wise, but will have a hot small block, and at 51 years old, a little less noise and heat would be nice.
I’d like to use some sort of sound deadener under the carpet.
There are a lot of them out there, what is everyone using, and what kind of results do you have with it?
Tell me the good/bad etc.

Thanks all!

Wally.

fatmat.com
material called rattle trap.

Ive used it in several builds and highly recommend it

It's Pretty

Another vote for FatMat

May want to first reduce the heat and sound BEFORE it gets to floor, ie, run exhaust to back bumper, use SS plpe and heat wrap where most useful, use reflective radiant barrier on road side of floors, choice of muffler, use a crossover, get a bigger stereo, etc. None of that would be in lieu of sound deadener, but sure would improve the results.

I used Eastwood and Dyna Mat sound deadener, then added 1/4" of aircraft sound deadening closed cell foam on top of that

I've heard you can use sticky insulation from Lowe's/Home Depot that's for duct work. Not the fiberglass material, but something like dynamat stuff.

I believe it was Fat Mat that I used in the Sport Satellite . . .

One of the builds Garage Squad did, they used something from a hardware store that according to them was less than half the cost.



Tim

Think the Fat Mat stuff is much less than the Dynamat . . .

Agree with the replies about sourcing from the hardware store and saving money.

The rubber boot matting for house use is very easy to work with and affordable. The tar strip stuff works, it's what the OEM's are using and can be found at the big box stores. Or, you can order it from Amazon and give the courier guy a hernia. If you pull apart a new vehicle, the OEM's only have a strip here and there.......which brings up the next point: It is quite a science and there is more to it than just running that stuff everywhere. I tried it on my '02 Cummins to try to shut that 24 valve up: I pulled all the seats out and ran a heavy rubber matting right from the bottom of the dash to the bottom of the back window. It didn't make a bit of difference. My understanding is it's the actual shape/forming of the metal that has a lot to do with having a quiet interior.

Not trying to discourage you from trying, whatever you do will make it better.

Car looks great Wally, my favorite color to have a Demon in!

If you put the hardware store stuff in your car, be sure its Butte rather then asphalt based. The Asphalt based stuff can give off asphalt smells when it gets hot, probably not something you want to small all summer long.

I use a product called Noico I bought off Amazon. 36 Sq ft of the 50 mill stuff is what I use inside my hot rods, its butte based and costs around $67 delivered. Its as effective as Dynomat, easier to install, and about 1/2 the price, Gene

Has anyone had any issues with these products causing the molded carpet not to fit right?

All very good advice and very good points to bring up.
I was about to pull the trigger on the fat mat when the hardware store stuff came up.
I’ll look into that today for sure.
Thanks for the compliment Grizz. Black always looks good, but very hard to keep clean!
I appreciate all the help with this guys.

Wally.

Ive used either Fatmat or Dynomat in maybe 6 or 7 cars the past few years. Not one did it cause any carpet fit issues.

That’s very good information, thanks.
I looked into the duct insulation from Home Depot
It looks a little thick? (0.3125 of an inch) 5/16. Too thick?

https://www.homedepot.com/p/Reflect...ective-Insulation-Roll-BP48025/100052556

Thanks again all.

There are no magic bullets with this issue, the end result is based mainly on thickness, or weight, or some combination. More always being better regarding attenuation. Everything else is mainly marketing.

Is there a concern with the adhesive backed insulations like dynomat and moisture getting underneath? I've considered them too, but despite doing my best to seal my cars and keep them out of the rain, I will get caught in one and a wash is necessary now and then. I liked to be able to occasionally remove door sills and get my hand under everything and check for dampness.

I wonder are products like dynomat going to stop every bit of moisture from getting underneath?

Good question Larry, Thank you.
Another question........Does anyone put this stuff on the ceiling of their car under the headliner?
How about on the door skin?

Thanks again all!

Wally.

I have,
in maybe 3 or 4 cars Ive done. ( all but one were black vinyl tops cars )
It makes HUGE difference in nose resonance on the interior of the car. I put it on the insides of the doors and makes a big difference in how solid the door sounds when closing

I did a 1970 hemi cuda clone build several years ago and installed the rattle trap on just about every square inch of the interior ( even under the pkg tray board )
Car has aftermkt A/C and owner says it helps keep the car
A - very cool and
B - very quite on road trips