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Thread: Cork as sound deadener? Recommend other materials to absorb noise.

  1. #1
    FLAC
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    Cork as sound deadener? Recommend other materials to absorb noise.

    I have been pretty obsessed with killing the road noise in my car, but without spending a ton.

    Currently, my doors have three layers of Resisto (asphalt based roofing mat) and a layer of heavy foam based carpet underlay. The floor of my car, including the trunk floor has two layers of foam based carpet underlay. This is all on top of the stock deadener. I got the foam carpet underlay for free, which is why I have been using it everywhere. However, the stuff doesnt seem to kill road noise as much as I hoped so I am thinking maybe there is better material out there to absorb road noise.

    I notice that in music rooms or recording studios, they use cork to absorb sound. Do you guys think this would be a good idea to use in the car? I always read about people using carpet underlay, peel and seel, dynamat etc... but never cork. The stuff is only about 3mm thin and fairly expensive, so I dont see myself using anymore than 3 layers on the floor and door.

    Suggestions on other sound absorbing materials welcome. I dont really want to go for an aftermarket mat type material because those are expensive and seem more focused on killing vibrations, rather than absorbing sound.

  2. #2
    FLAC greatwhite's Avatar
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    Hmmm, seems you're trying to eliminate "sound" in the car by insulation.

    Most road noise is the resonance of the vehicles metal panels. Aftermarket stuff bonds to the metal for a reason. It adds mass. This helps to keep the panel from resonating. They also have other qualities that help eliminate sound, mostly "coverting" the sound energy into a different form of energy (essentially, dampening).

    By just laying foam (underlay) on the floor you've helped some, but by using the wrong mechanism.

    It's doubtfull if bonding the material to the car will help much more either. You really have to add mass to the panels.

    I'm not saying all your efforts are for naught, just that they aren't going to as be effective as the proper materials (as you've found out already).

    But your car is probably well insulated for winter

    Cheers
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  3. #3
    Maximum Bitrate v8 scimitar's Avatar
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    put the foam in your ears that will work lol. Seriously tho as greatwhite says really and the cork is to dampen reflected sound which is not what your problem is. Vibration is sound that's why Dynamat works by stopping it.
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    FLAC
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    Thats a good point about the mass loading to kill vibrations. That's why I have a layer of Resisto stuck onto the metal as the mass barrier, then I have another layer of carpet underlay foam as a sound barrier (which its not very good at).

    I saw an informative thread on the civicforums about using "jute." It looks like the stuff that is used as a stock sound absorber in most vehicles:

    http://www.civicforums.com/forums/21...ening-diy.html

    Seems to be a promising material. Maybe I'll see if I can get it cheap somewhere.

  6. #6
    FLAC greatwhite's Avatar
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    Jute is ust the stuff stuck to the back of factory carpets.

    Not that effective, but it is heavy.

    God help you if it gets wet.................
    For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
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  7. #7
    FLAC WuNgUn's Avatar
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    I worked at an AC shop, and they used this stuff (we called gumbo), but it's basically a type of plumbers tape, made from cork and tar and maybe rubber...
    I've used that to line the panels in my car, and laid 1/2" black, closed-cell foam rubber on top of that (also from the AC shop), and the difference is amazing...especially in the doors.
    I've done the trunk, rear quarters, doors, B and C pillars...
    I'll be doing the front wheel wells and the bottom door sills this season...

  8. #8
    Low Bitrate FordNoMore's Avatar
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    If Dynamat seems a bit expensive, you can check out some of the generic Sound and Vibration Damping Sheets at McMaster Carr. Search for catalog pg 3427. Some of them are along the lines of original Dynamat (DLF = 0.08 at room temperature). I used some a few years ago and I THINK it was 9709T39, but I can't remember for sure.

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    I use spray on truck bed liner. Works great and you can put it on thick. It is a little bit expensive. For 100 bucks you get like a gallon.

  10. #10
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    Cork...

    ... tends to stink. That is the thick chopped cork tiles; I think the sheet stuff might be too thin to do you any good.

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