Installing sound deadener question
Thread Starter
Instructor
Joined: Oct 2014
Posts: 124
Likes: 1
From: Warner Robins GA
Installing sound deadener question
I am getting ready to install the sheets of sound deadener. I notice in a lot of pics online that every square inch of the car's interior is covered with the sound deadener. Is more better in this case? Is it really necessary to have full coverage with this, or do I just need to have most of the flat surfaces covered? I notice on new cars, they just have it in strategic areas, not everywhere.
I will still be coming back with full coverage of heat insulation.
I will still be coming back with full coverage of heat insulation.
Safety Car
Joined: Dec 2012
Posts: 3,799
Likes: 1,712
From: Summerville SC
I just did my '78 w/ dynamat extreme. I put it everywhere, including inside the doors. I have seen the small patch on the new cars, and I guess they explain it by saying it stops the vibration, hence the sounds. I just figured I had EVERYTHING out of the car, so for the sake of about $200 I did the whole thing. Found a lot of openings where sound, heat and critters could come in. JUST for an FYI, I used 72 square feet with almost nothing left over.
Safety Car
Joined: Mar 2007
Posts: 3,518
Likes: 37
Some people say just cover the larger panels to stop them from vibrating so easily. It is not much more cost to just do everything.
I've seen some new cars use some patches of a heavy putty like stuff strategically placed on the panels under the carpet but the car was engineered for placement of that much stuff in that specific place. With a car not set up for it you might as well cover everything.
I also would cover the outer door skins from inside the door to help with noise. Pull off the door panel and stick it to the outer skin.
There are a couple products that are like Dynamat but less expensive and with better specs. Fat Mat Extreme is one and you can get it with no logo if you want.
Then put your heat proof layer on top like you mentioned. Frost King from Lowes works fine for that.
I've seen some new cars use some patches of a heavy putty like stuff strategically placed on the panels under the carpet but the car was engineered for placement of that much stuff in that specific place. With a car not set up for it you might as well cover everything.
I also would cover the outer door skins from inside the door to help with noise. Pull off the door panel and stick it to the outer skin.
There are a couple products that are like Dynamat but less expensive and with better specs. Fat Mat Extreme is one and you can get it with no logo if you want.
Then put your heat proof layer on top like you mentioned. Frost King from Lowes works fine for that.
Safety Car
Joined: Feb 2012
Posts: 4,705
Likes: 983
From: Orlando FL
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
To answer your question, no you don't have to cover every square inch. I didn't and sound is significantly less.
I did cover large flat panels completely.
Inside doors I placed large strips on the inside of the outer skin.
Rear storage boxes got strips too.
inside surface of outer skin of t-tops got strips and reflectix as did the rest of the car.
Used 3m spray contact glue for the reflectix.
I did cover large flat panels completely.
Inside doors I placed large strips on the inside of the outer skin.
Rear storage boxes got strips too.
inside surface of outer skin of t-tops got strips and reflectix as did the rest of the car.
Used 3m spray contact glue for the reflectix.
Racer
Joined: Aug 2013
Posts: 264
Likes: 58
From: Virginia
Is that stuff from Lowe's sticky on one side, or did you use some sort of adhesive? Like the 3M spray stuff?
Thanks, Took me too long to type the question!
Thanks, Took me too long to type the question!
Last edited by CV62Air; Oct 11, 2015 at 06:41 PM. Reason: already answered
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Race Director
Joined: Apr 2009
Posts: 19,294
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From: Charlotte NC
I prefer DynaMat...but that is just me.
When I put it in I coat the entire surface from the underside of the lower windshield area..darn near all of the firewall area... all the way back to the rear seat mounting bolts. I do this because the DynaMat Extreme cuts down 15 degree Fahrenheit with this one layer. the I apply the next layer of DynaMat product (DynaPad) which takes it down MUCH further than that.
You can do partial sections because the DynaMat Extreme will not cause any issues in how the carper fits.....it is just not thick enough to have that even be a concern.
DUB
When I put it in I coat the entire surface from the underside of the lower windshield area..darn near all of the firewall area... all the way back to the rear seat mounting bolts. I do this because the DynaMat Extreme cuts down 15 degree Fahrenheit with this one layer. the I apply the next layer of DynaMat product (DynaPad) which takes it down MUCH further than that.
You can do partial sections because the DynaMat Extreme will not cause any issues in how the carper fits.....it is just not thick enough to have that even be a concern.
DUB
Safety Car
Joined: Feb 2012
Posts: 4,705
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From: Orlando FL
Burning Brakes
Joined: Mar 2014
Posts: 904
Likes: 46
From: Crestline CA
No, there's no point in covering the entire floor with it, all its for is to dampen vibrations in large flat panels. I suppose if you covered the entire floor you might gain a bit of sound absorption and maybe a bit of heat blocking but that kind of like digging a hole with a rake, it'll work but its hardly the best way to do it.
Drifting
Joined: Apr 2013
Posts: 1,748
Likes: 268
From: Central Wisconsin
Yes it is sticky on one side its also called ice and water dam. I used it on the floor of my Camaro. It conforms great and stays put. Any building supply outlet will have it.
Pro
Joined: Feb 2014
Posts: 607
Likes: 122
I did the whole car and with mistakes used about 80 square feet. If your interior is out, why not? Once you get started, it like eating potato chips, you stop when you run out and it does not affect carpet fit at all.
Burning Brakes
Joined: Dec 2010
Posts: 945
Likes: 10
From: Winston Salem NC
I did floor pans, tranny tunnel, firewall, waterfall and most of the doors. Plus battery box, storage tubs and area behind them.
I had a do it while I'm in here approach. I am pleased with the quieter ride. I also put down reflextix insulation at the same time.
I had a do it while I'm in here approach. I am pleased with the quieter ride. I also put down reflextix insulation at the same time.