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To Dynamat or not to Dynamat.....

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Old 10-11-2017, 08:28 PM   #1
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To Dynamat or not to Dynamat.....

Just ordered new ACC carpet with mass backing and am unsure if that alone with the jute pad is sufficient or should I also add Dynamat when installing?

I am unsure if #1 it's overkill and #2 if the carpet will even sit right or be to bulky with all that.

Have never done carpet before so looking for some ideas on this.

Thank you!

Chuck
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Old 10-11-2017, 08:51 PM   #2
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Re: To Dynamat or not to Dynamat.....

That padding is pretty thick, I am doing it on my GTA now. I skipped doing the floors with dynamat type material and plans to do the doors. It seems if you wanted to do the floors, order the carpet sans the mass backing and do your own sound deading on the floor. I have the same fear as you, with mass backing it seems the carpet would not lay right.
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Old 10-11-2017, 08:52 PM   #3
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Re: To Dynamat or not to Dynamat.....

I put dynomat in certain areas like above where the exhaust is before putting in my mass backing ACC carpet and I'm not too happy with how it came out, sounds kind of crinkly when I step into the car. I'm contemplating redoing certain areas of it. But don't let my experience discourage you from it, I've seen pics on here of other member's dynomat jobs and they did a great job with it.
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Old 10-11-2017, 09:03 PM   #4
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Re: To Dynamat or not to Dynamat.....

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Originally Posted by Neil350 View Post
That padding is pretty thick, I am doing it on my GTA now. I skipped doing the floors with dynamat type material and plans to do the doors. It seems if you wanted to do the floors, order the carpet sans the mass backing and do your own sound deading on the floor. I have the same fear as you, with mass backing it seems the carpet would not lay right.
My plan was not to Dynamat at all but wanted others opinions too, so thanks for your insight!
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Old 10-11-2017, 09:03 PM   #5
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Re: To Dynamat or not to Dynamat.....

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Originally Posted by TylerSteez View Post
I put dynomat in certain areas like above where the exhaust is before putting in my mass backing ACC carpet and I'm not too happy with how it came out, sounds kind of crinkly when I step into the car. I'm contemplating redoing certain areas of it. But don't let my experience discourage you from it, I've seen pics on here of other member's dynomat jobs and they did a great job with it.
Thanks for the feedback!
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Old 10-12-2017, 07:58 AM   #6
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Re: To Dynamat or not to Dynamat.....

On both my cars, I have a layer of the foil-backed rubber Dynamat topped by a layer of Dynapad (which is a multilayer foam) with the mass backing on my carpet. It's definitely a tighter fit to get all the interior panels and center console installed but it's doable. Bottom line, I noticed a great improvement in the interior noise levels of my cars.

In the 87, I originally started with just Dynamat. Interior noise levels were reduced but not as much as I'd really hoped. Later on, I got the 89 and pulled the carpet to repair the rusted floorboards. I went with both Dynamat and Dynapad when I put the carpet back in. The interior noise levels on the 89 were noticeably better than on the 87. When I decided to replace the carpet in the 87, I got replacement carpet from ACC with the mass backing and I also put in a layer of Dynapad. It's a tight fit but I got everything back in. Interior noise levels in the 87 are now as good as the 89. I'll have to look, I have pictures somewhere.

Also, another tip is to look into Dynamat and Dynapad alternatives. From what I've seen there are cheaper, equal alternatives. Just don't go for the asphalt roof sealer some people suggest.
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Old 10-12-2017, 08:05 AM   #7
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Re: To Dynamat or not to Dynamat.....

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Originally Posted by 87v6Bird View Post
On both my cars, I have a layer of the foil-backed rubber Dynamat topped by a layer of Dynapad (which is a multilayer foam) with the mass backing on my carpet. It's definitely a tighter fit to get all the interior panels and center console installed but it's doable. Bottom line, I noticed a great improvement in the interior noise levels of my cars.

In the 87, I originally started with just Dynamat. Interior noise levels were reduced but not as much as I'd really hoped. Later on, I got the 89 and pulled the carpet to repair the rusted floorboards. I went with both Dynamat and Dynapad when I put the carpet back in. The interior noise levels on the 89 were noticeably better than on the 87. When I decided to replace the carpet in the 87, I got replacement carpet from ACC with the mass backing and I also put in a layer of Dynapad. It's a tight fit but I got everything back in. Interior noise levels in the 87 are now as good as the 89. I'll have to look, I have pictures somewhere.

Also, another tip is to look into Dynamat and Dynapad alternatives. From what I've seen there are cheaper, equal alternatives. Just don't go for the asphalt roof sealer some people suggest.
Great info, thank you! I've seen that roofing stuff on youtube from lowes/walmart and wondered lol.
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Old 10-12-2017, 11:33 AM   #8
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Re: To Dynamat or not to Dynamat.....

One of the things that the dynamat does that foam doesn't is dampen vibration in the sheetmetal. If you're using both, you don't have to use dynamat everywhere, just in the big flat sections.

A good way to tell is to tap on the surface your going to cover. If it sounds like your hitting a drum, then it would really benefit from the dynamat to stiffen the panel. Curved and integrally stiffened areas, like the trans tunnel, aren't as prone to vibration so the foam alone will be more effective there.

I used dynamat on mine, although not 100% of surfaces. I haven't decided yet which additional insulation to use.
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Old 10-12-2017, 01:04 PM   #9
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Re: To Dynamat or not to Dynamat.....

You really don't need it,the jute and the mass backing is pretty thick already.
Some people like it .some don't.
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Old 10-12-2017, 09:35 PM   #10
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Re: To Dynamat or not to Dynamat.....

I guess it's all comes down to what you're looking to do with your car. I'm not worried about added weight, since my car will be a cruiser and not a racer.

I used some stuff called Fatmat I found on ebay and it really helped knock the "tin can" sound in my camaro. I actually liked it so well that I put some in my daily driven pickup and it made quite a difference when all the windows are up.
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Old 10-12-2017, 10:16 PM   #11
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Re: To Dynamat or not to Dynamat.....

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Originally Posted by jharrison5 View Post
I guess it's all comes down to what you're looking to do with your car. I'm not worried about added weight, since my car will be a cruiser and not a racer.

I used some stuff called Fatmat I found on ebay and it really helped knock the "tin can" sound in my camaro. I actually liked it so well that I put some in my daily driven pickup and it made quite a difference when all the windows are up.
Mine is just a cruiser as well. Is this Fatmat installed under the jute and carpet with mass backing? Thanks!
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Old 10-12-2017, 11:04 PM   #12
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Re: To Dynamat or not to Dynamat.....

Yes , it is installed under the carpet,If your car is just for cruising and it's so noisy use it ,If not, Don't waist your money.
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Old 10-13-2017, 10:30 AM   #13
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Re: To Dynamat or not to Dynamat.....

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Originally Posted by tomsaddy View Post
One of the things that the dynamat does that foam doesn't is dampen vibration in the sheetmetal. If you're using both, you don't have to use dynamat everywhere, just in the big flat sections.

A good way to tell is to tap on the surface your going to cover. If it sounds like your hitting a drum, then it would really benefit from the dynamat to stiffen the panel. Curved and integrally stiffened areas, like the trans tunnel, aren't as prone to vibration so the foam alone will be more effective there.
This is 100% accurate. You only need 25% coverage on flat panels with Dynamat and the like.

In my car I used Fatmat ~25-50% coverage on all the flat places on the floor, then I put a layer of Mass Loaded Vinyl in addition to the mass backed carpet. I think it made a huge difference in the interior sound reduction. I haven't done the doors or the B pillars yet though, I am hoping to get close to what the sound level reduction would be out of a new car. I also did the roof with Fatmat, again 50% and I put butyl rope in the cracks if the reinforcing bits to the flat panels, that made a big difference in the vibration reduction up there compared to just the fatmat on the flat surfaces.


**EDIT, should be 25%, not 50, sorry***

Last edited by scooter; 10-13-2017 at 11:54 AM.
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Old 10-13-2017, 02:12 PM   #14
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Re: To Dynamat or not to Dynamat.....

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Mine is just a cruiser as well. Is this Fatmat installed under the jute and carpet with mass backing? Thanks!
Yup it came in a big roll and I just cut it to fit. I covered the entire floor because i didn't know any better, but when I did the pickup I used it sparingly on the flat areas.

Here's the link to my build with the pics of the mat installed.

https://www.thirdgen.org/forums/memb...ml#post6024079 (Second chance after 12 long years!)
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