Thread: Dynomat => Noise Proofing

Check out the forums a SoundDoman.com. Dynomat is a brand and therefore very pricey. It is basically justa rubberized product that is also used for protecting roofs on houses. It is referred to as Ice-Gaurd and you can get a lot cheaper than dynomat.

i put some in my car. Dynamat is expensive and i spent $40 to just do my 2 doors. Its cool stuff, but expensive. I also got some stuff off ebay that was cheaper and i used that on the rest of the car. In all, i do notice that there is not as much road noise and there isnt any nasty rattling from bass.

Rodkill is another asphault based sound damping material that works really well. Check out my sonoma: http://www.geocities.com/stevebang2000/Sonoma.html
There is total of ten sheets in the vehicle, each sheet is 3X4 feet I believe.

Here is the deal, this type of material lowers the resonance frequency of the material it is applied to by adding mass, it does not block noise. The lower frequency resonace requires more energy to make, plus your ear is less sensitive to these frequencies therfore lowering the overall noise.

To block noise, you need to use something that traps air, like foam. Roadkill makes a very good closed cell foam that has a layer of asphault based material attached to it. This is excellent for blocking noise and reducing resonance frequencies. The only problem with this stuff is that it does not have an adhesive layer from the factory. You have to use a good contact cement to attach it. I added about 30 sq feet of this stuff after I found out about it, and it made a huge difference.

In the end, the more you use the quieter your car is going to be. Believe it or not, I had a customer who brought two vehicle to me about a month ago. We put $5000.00 worth of these two types of Rodkill in both vehicles, well over 100 lbs in each.

Another alternative is a product called Grace Ice and Water sheild. Really cheap (30 dollars for a roll 5' X 40') and it is self adheasive. I would be somewhat warey about using a foam based material. Up here in Maine winter is not kind to vehicles at all, they get filled with snow and road salt. I would think that the foam material would have a tendiency to cause wicking; pulling the salt-water mixture to the metal body of the car and holding it there. If it were me I would rather go with the product that is MADE for waterproofing.

Just a thought