Sound dampening

[Nightpath]

Don't know if this is the right section for it, but it does deal with the body.

Anyways, been thinking, besides carpet, how to dampen the sound coming into the car. It's already not too bad, but a little more can't hurt.

What have you guys done to dampen sound? I was thinking of putting expanding foam into the A-pllars and the folded sections on each side of the roof, as well as some insulation for the rear under the panels in top of the wheel wells.

heres some stuff I was thinking about :

Roxul for the firewall, and right in front of the shifter. reflects heat and doesn't burn : http://www.roxul.com/products/residential/roxul+safe'n'sound

http://www.rona.ca/en/insulation-04125311--1

for the ceiling : http://www.rona.ca/en/insulation---a2a-hi-performance-insulation

[IowaEagle]

With foam you have to fill every possible air pocket.  If not you will get localized rust in areas.  Where do the most of the road noises come from?  I am wondering if your Eagle did not come with extra quiet insulation.

[priya]

There's a product called lizard skin which sprays on and is designed to deaden sound.  It won't cause rust issues as something like house insulation may due to trapping and holding moisture.

[Nightpath]

One of the biggest problems is that I'm in Canada, and a lot of the products available in the US isn't up here.

One of the things I am going to do is get the extra backing on the carpet when I purchase it, or fine a type of housing insulation that's for sound dampening. I've noticed that the old guy that had my car didn't keep an eye on the transmission hump and the carpet has to be picked off of it (melted on). At this point I might pick up some Rocksul to layer where it's hot (doesn't melt, reflects the heat, made from rocks )

Might try to see if I can find some yoga mats to cut and fold, read that it fits nicely and can absorb a lot of sound. There are several types of expanding foam, but most of them will hold in moisture. Was also thinking those foam pipe insulators, squeeze them inside just to dampen a bit of noise.

[Amc1320]

Hi nightpath

I used bubble wrap insulation that has a foil cover, not sure what the real name is....

Its used to insulate metal buildings, got some from a local metal roofing place, its real cheap and they just had some scrap pieces

I put it under the carpet, on the wheel wells in the back and everywhere else I could put it, I just cut it with scissors and used spray adhesive to keep in in place.

Made everything very quiet. Here is a pic I found that shows some of it as I was doing the floor in our Gremlin

[BenM]

There are lots of expensive products out there... but I shopped around the roofing and insulation supplies. The factory wasn't nearly as sophisticated as what's available now down at the home store and I'm a bit of a rambler mentality guy.

The felt carpet padding is standard felt carpet padding. (The foam padding just degrades too easily from light and heat, so avoid that.) Seams were filled with hot tar so they didn't rattle. Sometimes the felt padding had tar paper glued to it for some dampening. Before felt they used jute.

I've been happy so far at how the stuff holds up.

My procedure on the inside is to pull out everything in the area I'm working on, clean the metal and wire brush if necessary, then hit it with some rust converter primer in any bad spots. Small holes in otherwise good metal can get body plugs or sealer, but you want to eventually seal the area. Don't use silicone or RTV. You can paint over the kind of sealers you should use. It seems factory paint was thin and uneven if it existed inside.

Some people have just put a bedliner down instead of carpet, but it can't hurt under a carpet either. I've done that. It has mass and can be used to fill small gaps. It helps eliminate the 'tinny' noises. There's some good self adhesive roof flashing as well, again something to dampen noise. It's generally not as thick as the professional sound matting, but most brands are just the same asphalt-based stuff, the rest is adhesive on proprietary rubber sheet mixes.

I put some rubber mat inside doors after priming and painting. The factory tar had dried and come off, and the rubber really made the door sound solid when it was closed. The foil bubble wrap is great in the roof, it helps keep the car cool on sunny days. I also put some self-adhesive neoprene rubber on the inside of plastic panels and where panels rub metal to stop squeaks. It beats the old open-cell foam the factory used.

You have to be careful you don't make stuff to thick. . :-)

I'm sure the stereo guys and high-end restorers scoff at me, but the stuff works and holds up as well or better than the factory stuff for a fraction of the price of the high end stuff. The key for all of it is to clean, prime, clean, use a good 3M adhesive when you need one, and clean. Don't forget to clean.

[Nightpath]

That silver stuff is the same stuff I've been looking at. Awesome to see that someone else has tried it!

[vangremlin]

I've used the same silver/bubble wrap material as Amc1320 under carpeting.  It worked really well!  Good luck.

[Draekon]

Does anyone know that the silver bubble wrap stuff is called?

[JayRamb]

A couple years ago I tore out my seats and carpet, put sound insulation in. I used 'dryer vent' insulation from Home Depot. It was cheap, has a sticky back, padded and sound proofed the heck out of that car! It is SO sound tight. I love it!

[Mernsy]

Does anyone know that the silver bubble wrap stuff is called?

SILVER FOIL BUBBLE WRAP INSULATION, I think.

http://www.ebay.ca/itm/SILVER-FOIL-BUBBLE-WRAP-INSULATION-9M-LONG-750MM-WIDE-/350663203695

[Nightpath]

It's called Ayr-Foil at Home Depot. I picked up a crapload and it's cheap.