73 Carpet Padding / Sound Deadener
Thread Starter
Burning Brakes
Joined: Apr 2017
Posts: 877
Likes: 80
From: Frederick MD
73 Carpet Padding / Sound Deadener
Good Morning All,
I opened the box I got at Carlisle last year with my black 80/20 carpet in it to let it snap back into shape for a few days and found that it did not have the jute padding which I thought it had. Should I consider anything other than the jute padding? In my other C3s and 64 that is all I used. I do like a quite interior and I have put on quiet rear exhaust, I put a bit of a cam in the LS3 so it has some rumble to it. Also I did the removable rear window conversion and generally never drive with unless the tops are off.
Any thoughts are welcome.
Scott
I opened the box I got at Carlisle last year with my black 80/20 carpet in it to let it snap back into shape for a few days and found that it did not have the jute padding which I thought it had. Should I consider anything other than the jute padding? In my other C3s and 64 that is all I used. I do like a quite interior and I have put on quiet rear exhaust, I put a bit of a cam in the LS3 so it has some rumble to it. Also I did the removable rear window conversion and generally never drive with unless the tops are off.
Any thoughts are welcome.
Scott
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Jute padding is a really good heat insulator (and inexpensive). For sound deadening, the original tar-soaked fiberboard stuff worked pretty well...but no one sells that, anymore. The aftermarket sound deadeners are all pretty expensive. Something dense & pliable is good at soaking up high frequency noises (rattles, ticks, ringing, etc). Roofing underlayment???
Racer
Joined: Jul 2015
Posts: 396
Likes: 101
From: Lehigh Valley Pennsylvania
Scott, I went for quiet too. In my 73, I used 1/2" of jute and glued 1/8" of mass loaded vinyl to the jute. I insulated every part of the interior that I could get to. I closed every hole in the passenger compartment too. I probably would use thinner jute because installing the dash and interior parts was difficult with the extra thickness. I had to rip it out around the gas pedal because my foot wouldn't fit. I also struggled to get the carpet to lay nice with the extra thickness. I used 2" black electrical tape to tape the seams in the MLV. The car is unbelievably quiet with the windows up.
I did a fair amount of research and used the following as guidelines
1. Most people can hear a 2 db change in noise level.
2. 3 db is about a 50% reduction in sound energy. These two statements imply that you have to insulate a fair amount of surface to get any noticeable reduction
3. A 1 inch hole in a 10 ft by 10 ft block wall lets in more noise than the 10 ft by 10 ft wall. Based on this I closed up every gap and hole into the interior.
I did a fair amount of research and used the following as guidelines
1. Most people can hear a 2 db change in noise level.
2. 3 db is about a 50% reduction in sound energy. These two statements imply that you have to insulate a fair amount of surface to get any noticeable reduction
3. A 1 inch hole in a 10 ft by 10 ft block wall lets in more noise than the 10 ft by 10 ft wall. Based on this I closed up every gap and hole into the interior.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Actually Scott,
On factory original cars you had the carpet and then a deadner kit. What happened was when people started making carpet sets for these old cars they got patterns which usually had the deadner stuck to the back of it. It was not stuck there by the factory it was placed down and then it seems to embed itself in the backing on the carpet.
The only areas that I've found the jute actually made onto the carpet was the rear T section and on some cars the section that goes up behind the rear of the seats and over the lip.... typically they had a small section.
You can view some of these pictures at this link.
https://docs.google.com/document/d/1...vOnUyBg8U/edit
You can also view some of this info on how the rear deadner went into the car at this link. http://repairs.willcoxcorvette.com/1...-installation/
So in a nut shell, the deadner was made separate from the carpet in the front, on the rear humps and anywhere else used. When carpet manufacturers started making these carpet sets they put jute on them instead of the mastic backed jute which will really cause a problem if you try to use both. When we order carpets for in the shop we order the mastic backed deadner and the carpet sets without any jute on them.
E
On factory original cars you had the carpet and then a deadner kit. What happened was when people started making carpet sets for these old cars they got patterns which usually had the deadner stuck to the back of it. It was not stuck there by the factory it was placed down and then it seems to embed itself in the backing on the carpet.
The only areas that I've found the jute actually made onto the carpet was the rear T section and on some cars the section that goes up behind the rear of the seats and over the lip.... typically they had a small section.
You can view some of these pictures at this link.
https://docs.google.com/document/d/1...vOnUyBg8U/edit
You can also view some of this info on how the rear deadner went into the car at this link. http://repairs.willcoxcorvette.com/1...-installation/
So in a nut shell, the deadner was made separate from the carpet in the front, on the rear humps and anywhere else used. When carpet manufacturers started making these carpet sets they put jute on them instead of the mastic backed jute which will really cause a problem if you try to use both. When we order carpets for in the shop we order the mastic backed deadner and the carpet sets without any jute on them.
E
Melting Slicks
Joined: Apr 2001
Posts: 2,030
Likes: 363
From: Lubbock Texas
Years ago I used a product called RAAMmat from RAAMAudio on my '73. At the time, it was a lot cheaper than Dynamat or similar. http://www.raamaudio.com/
I didn't install it under the carpet though. Previous owner had glued down new carpet and I didn't want to pull it up. I used it under the rear deck and various other places to help quieten the car down, The rear deck had a resonant vibration due to muffler drone and it helped with that. The RAAMmat was supposed to be thinner than Dynamat and work just as well. I won't hesitate to use it under my carpet if I ever pull it up assuming the price is still acceptable compared to the others.
DC
I didn't install it under the carpet though. Previous owner had glued down new carpet and I didn't want to pull it up. I used it under the rear deck and various other places to help quieten the car down, The rear deck had a resonant vibration due to muffler drone and it helped with that. The RAAMmat was supposed to be thinner than Dynamat and work just as well. I won't hesitate to use it under my carpet if I ever pull it up assuming the price is still acceptable compared to the others.
DC
Thread Starter
Burning Brakes
Joined: Apr 2017
Posts: 877
Likes: 80
From: Frederick MD
Actually Scott,
On factory original cars you had the carpet and then a deadner kit. What happened was when people started making carpet sets for these old cars they got patterns which usually had the deadner stuck to the back of it. It was not stuck there by the factory it was placed down and then it seems to embed itself in the backing on the carpet.
The only areas that I've found the jute actually made onto the carpet was the rear T section and on some cars the section that goes up behind the rear of the seats and over the lip.... typically they had a small section.
You can view some of these pictures at this link.
https://docs.google.com/document/d/1...vOnUyBg8U/edit
You can also view some of this info on how the rear deadner went into the car at this link. http://repairs.willcoxcorvette.com/1...-installation/
So in a nut shell, the deadner was made separate from the carpet in the front, on the rear humps and anywhere else used. When carpet manufacturers started making these carpet sets they put jute on them instead of the mastic backed jute which will really cause a problem if you try to use both. When we order carpets for in the shop we order the mastic backed deadner and the carpet sets without any jute on them.
E
On factory original cars you had the carpet and then a deadner kit. What happened was when people started making carpet sets for these old cars they got patterns which usually had the deadner stuck to the back of it. It was not stuck there by the factory it was placed down and then it seems to embed itself in the backing on the carpet.
The only areas that I've found the jute actually made onto the carpet was the rear T section and on some cars the section that goes up behind the rear of the seats and over the lip.... typically they had a small section.
You can view some of these pictures at this link.
https://docs.google.com/document/d/1...vOnUyBg8U/edit
You can also view some of this info on how the rear deadner went into the car at this link. http://repairs.willcoxcorvette.com/1...-installation/
So in a nut shell, the deadner was made separate from the carpet in the front, on the rear humps and anywhere else used. When carpet manufacturers started making these carpet sets they put jute on them instead of the mastic backed jute which will really cause a problem if you try to use both. When we order carpets for in the shop we order the mastic backed deadner and the carpet sets without any jute on them.
E
