I'm putting new carpet into my coupe as part of the rebuild. The shop doing the work doesn't want to do anything besides put new jute padding under the carpet. They don't think that the Dynamat does much and will make the carpet fit poorly. I was planning on using the pre-cut kits from Jegs.

What kind of results have others had?

 

Have not used Dynamat, but have some experience with Frost King from Lowe's. Same thickness/composition. About 1/8" thick, foil on one side, rubber on the other. Used in a '67 GTO, it made a HUGE difference in heat reduction and in cabin noise. Car drives/feels much tighter and much less road noise. I would not install a new carpet these days without one of the modern barrier mats. The stuff is no thicker than the original tarpaper used in a lot of older cars.

 

didnt you buy that car new? if so how did you survive the last 48 years without it?

 

Its called getting older.

i put up with a lot of stuff when i was 16-30 something, that i won't put up with now.

Doug

 

I bought the Vettenutz premium kit that lays down on the floor. But also purchased the Eastwoods Thermo Coustic butyl underlay for the floor - basically same as Dynamat. Just fitted a couple of areas and I won't be having a problem installing the carpet and jute padding over top.
Some have forgone the jute padding and just used the carpet on top.

Usually some trimming is involved where the space gets tight by the door sills and console area.

Don't understand why the shop won't do it?
They are getting paid by the hour aren't they?

As an aside I did finish my doors first. Just this alone quieted down the ride considerably - sidepipe car and loud. The difference just doing the doors was remarkable.

65-StingRay

 

As part of a new carpet installation I used a comparable product, Raamat, similar to Dynamat. The front half of the cabin, from seats forward, Frost King was layed over the Raamat.

The new padded carpet that was installed over the added thickness of the FK material went went in fine. Jute was not used.

Noise reduction was noticeable but not as much as I thought it would be. Heat reduction was also noticed, to a point. Average conditions, temps around 60-75 degrees, the FK slows down heat transfer into the cabin to a comfortable level. Around 85 degrees and above ambient air temp the heat becomes too much and will come through.

R value of FK is something around 3-4. . There are other heat barriers advertised as having a higher R value.
John

 

What are you trying to accomplish with Dynamat? It's primarily for vibration and resonance attenuation. That is not as big an issue with most fiberglass panels as with metal panels. Also, it's heavy.

If you were intending to use it for thermal insulation there are much better alternatives such as the Frost King insulation - probably save you about 75% in cost also. EZcool foil faced insulation also works well and is very light weight but does not have a self adhesive face.

If your intent was for sound and vibration dampening, Dynamat does not have to be applied to cover the entire surface of any area. Partial coverage (such as just under the seats or under the rear coupe cargo area is said to work as well as covering everything. A couple squares stuck to the inside of the outer door panels works as well as covering the entire surface.

IMO the reproduction jute blanket works just fine.

 

I install the Dynamat products...and I have never had a carpet NOT fit due to using it. I guess I am LUCKY!

I have had great success using it...and I have a customer( who is a forum member) who can tell you first hand what it is doing for is car when it is HOT outside and he has the A/C on.

If you care to hear from him on it...PM me and I will send you his information.

To each his/her own...

DUB

 

Years ago in my 67 ragtop I first put down B Quiet Ultimate for sound:


then I overlaid that with Frost King:


The carpet fit fine over these materials. No jute. Noise and temps were both noticeably reduced. Of course, noise in a convertible is never going to go down much; a coupe install might show a more dramatic noise reduction. I appreciate the heat reduction on hotter days when I use the AC. Go for the highest R value you can for temp control.

 

I'm looking for both sound and heat reduction. The side pipes and the L71 aren't nearly as much fun as when I was in my 20's and 30's (and the DW is even less tolerant these days!!!!).

I'm thinking of just using the dynamat and new jute over that.

Is the Frost King the same thickness as the jute?

 

Frost King comes in various thicknesses. If I recall correctly, I used the version that's 1/4" thick.

 

as said, dynamat and most (if not all) of it's brethren are for noise reduction, not insulation...

if the manufacturer doesn't give an R value, assume there is little or none...
Bill

 

I doubt Frost King is as good at dampening vibration and noise as products like Dynamat. That's not what it was designed for. But, it does have some mass and thickness to it so it probably accomplishes some reduction. But it weighs less than most of the bituman or asphalt sound mats, costs a fraction of the price, is foil faced, has a self-adhesive side, and you can pick it up at your nearest Lowes or Home Depot. If you don't want to use the jute mat I think you would be pretty satisfied with Frost King.

 

I used the dynamite on my 67, to reduce vibrations, and made the doors feel more solid as well. Then went over the top with duraliner from dynamite for heat barrier and sound. Carpet fit fine with both.
went for the precut package, and was very easy to instal

 

I have some custom cut pile carpet from Al Knoch for my
'61, which beside the thick plush pile has a foam rubber backing that is about 1/4 " thick.

What kind of backing is on the carpets you guys have...or that most have in this thread?

I would think that could/would make a little difference in thermal protection.

Manufacturers really lead off on the noise reduction rabbit trail...buy shy away from any specific information which would promote insulation characteristics.

ANYTHING will reduce noise, literally! So conversation about noise reduction is not very important, imho . Unless of course all you want is a "quite" rolling "oven"... or "skillet", when the top is down or off, LOL!

As has been stated many times in the numerous threads along this line...the heat needs to be stopped before it enters the floor pan or firewall. Once it's in ...it's to late to do much about it.

Under body shields, heavy Aluminum thermal backed tunnel insulation and spray-on ceramic under body treatments like Lizard Skin, will yield the best return on heat insulation or radiant barriers. FIRST.. is making sure there are zero holes or air leaks in any form, even minute ones...particularlty in the fire wall or transmission tunnel. Particular attention to high heat exhaust exposed underbody areas, all the way past the gas tank kickup is important as well. On a C1, due to the large vent holes under the gas tank, a radiant barrier like aluminum tunnel shielding or metal shield plates is about all you can do there...BUT you can also install a tunnel shield radiant barrier behind the seats "in the gas tank well" if you have the tank out.

You can't spend too much in those areas..beat the heat before it enters the car.

Stan

 

This is one thing I just don't get. It's a Corvette - noise is part of the experience.

Richard Newton

 

I thought that way too, until I drove a midyear convertible with sidepipes 2,800 miles in four days from MI to CA. Couldn't wait to tear off the sidepipes when I got home!

 

I have used Dynamat in 5 Corvettes , 57 through 65, and never had a carpet fit problem.
I normally use Dynamat Extreme.
It does a great job on reducing noise and vibration and although not specifically advertised as a heat barrier it does a fine job in my opinion. In my 57 and 62 the floor and transmission tunnel stay cooler even in the summer heat.
In my 65 coupe I put it on the inside of the door skins (60-70% coverage) and on the inside of the roof and the difference is very noticeable.
And it's made in the USA.
Bruce B

 

Dan, I agree. Frost King is primarily a heat/cold insulator, whereas Dynamat is primarily a noise insulator. I'd rather have a cooler car that's a little noisier for 1/16th the price of Dynamat, which would give me a quieter car that was hotter inside. We did the GTO in Frost King for about $25 total...Dynamat would have been something like $400. Made a big difference in noise AND heat.

 

I used Frost King on my doors and floor in my 65 and am very satisfied with the difference in heat and noise reduction ( and expecially like the price!)

Don