Best sound deadening material for trunk

[007]

What is the best aftermarket material I can use for sound deadening the inside of my trunk? I recently installed a truck kit and now I hear the exhaust. Kit came with thinner carpet and some sort of sponge vs jute.

 

[oilpsi2high]

I used Dynamat with good results back in the day.

 

[Bgallagher]

Originally Posted By: oilpsi2high
I used Dynamat with good results back in the day.


+1 Brown Bread was a cheaper option if I recall but Dynamat is the most popular

 

[4WD]

There is some good info on the web.
I have installed Dyna Mat (there are others, read up on it) as the first layer and then some 3/8" closed cell foam (also peel & stick) on top of the Dyna Mat. The butyl rubber mat density stops attenuation from the metal - the foam blocks noise - and they both help insulate a bit. Closed cell foam is way cheaper and helps avoid a 2nd layer of DM.

 

[007]

Would regular carpet padding work?

 

[Kira]

The DM will glue entirely to the metal, act like a coating of tar or rubber and deaden better than any carpet padding which would be less dense.
ALso, DM is thinner than padding.

 

[fsdork]

I've used Dynamat Extreme on doors, trunk, and package shelf in the past, with good results. I've heard stories of people using adhesive roofing membrane as a cheaper alternative, but I can't speak to any hands-on experience with that.

 

[007]

I heard "Peal and Seal" from Lowes is also an option. Anyone ever use it?

 

[ron350]

Better do your research any product designed for use on a roof can have carcinogens.

 

[SZR48207]

The roofing stuff will smell.

I've used these guys in the past. Seemed OK but I didn't go all out.

http://store.secondskinaudio.com/damplifier-pro/

 

[WANG]

For deadening, I really like knukonceptz kno knoise kolossus edition:
http://www.knukonceptz.com/mobile-audio/sound-deadening/kno-knoise-kolossus-edition/
Really good stuff. Much better than Hushmat Ultra that I have used.

Deadener will help with resonance, but for actually blocking the sound, you need something like mass loaded vinyl. This guy sells some relevant products, and has a a very good tutorial.
https://www.sounddeadenershowdown.com

I haven't used any roofing products in a n automotive environment, but have heard of problems with smell and losing adhesionin high heat conditions.

 

[007]

I am specifically looking not to hear my exhaust drone through the trunk.

 

[2010Civic]

Originally Posted By: 007
Would regular carpet padding work?


That's what I did. I bought carpet padding at Menards and put it in my trunk, door panels, under carpet, etc. I definitely made the car a bit quieter.

 

[007]

Anyone ever try this stuff?

https://www.amazon.com/Car-Insulation-Th...rinsulation.com

 

[4WD]

It looks like AstroFoil - have used in front doors only in black truck - and a dozen or so non automotive things ...