Sound/Heat insulation
Thread Starter
8th Gear
Joined: May 2011
Posts: 8
Likes: 0
From: Orono Mn
Sound/Heat insulation
Good morning: I am in the middle of a frame off restoration on my 68. I would like recommendations on which insulation under new carpet people like. Heat is my main consideration, 427, 390HP. I have had good luck with the tunnel insulation under the car but the rest of the under-body insulation, it seems to come off. Thanks in advance for any help. Doug
Race Director
Joined: Apr 2007
Posts: 14,062
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From: Henderson Nv-Rohnert Park/Sonoma C o. ca/born in NY Rockaway Beach.
Burning Brakes
Joined: Mar 2011
Posts: 969
Likes: 1
From: NJ
This is a future project for me as well. After doing some research it looks like the "popular" way to go is Dynamat or Fatmat first, then Reflectix on top of that. Reflectix will keep the heat out but will fo nothing for the sound. Vice versa for the Dynamat. I will probably go with Fatmat since its cheaper.
After these 2 layers, would you still need the regular carpet underlayment or can you put down the carpet directly on the Reflectix?
After these 2 layers, would you still need the regular carpet underlayment or can you put down the carpet directly on the Reflectix?
Melting Slicks
Joined: Jan 2003
Posts: 2,877
Likes: 13
From: Doha
St. Jude Donor '08
For the heat insulation use the Reflectix sheet below your carpet, its cheap and it works very well, DON'T buy the expensive stuff, you don't need it, I live in a place that has 110*F summers and I know what I'm talking about!
For the ultimate heat insulation, stick some zero-clearance sheets under your car body (above the tranny and on the lower firewall), I did that to my car and its so cool that I rarely need A/C to cool the cockpit down, except in the mid. summer days of course.
All the other stuff, like the dynamat and hushmate .. etc are really a sound deadening materials, and they very little in preventing heat transfer to the cabin, they do a very good job in preventing noise though.
For the ultimate heat insulation, stick some zero-clearance sheets under your car body (above the tranny and on the lower firewall), I did that to my car and its so cool that I rarely need A/C to cool the cockpit down, except in the mid. summer days of course.
All the other stuff, like the dynamat and hushmate .. etc are really a sound deadening materials, and they very little in preventing heat transfer to the cabin, they do a very good job in preventing noise though.
Last edited by HamadUP; Dec 28, 2011 at 02:45 PM.
Melting Slicks
Joined: Apr 2001
Posts: 2,030
Likes: 363
From: Lubbock Texas
I used RAAMmat from RAAMaudio for sound. Worked well and was less costly than the others I considered. If I remember correctly, Rick is a vette guy.
http://www.raamaudio.com/
DC
http://www.raamaudio.com/
DC
Burning Brakes
Joined: Mar 2011
Posts: 969
Likes: 1
From: NJ
For the heat insulation use the Reflectix sheet below your carpet, its cheap and it works very well, DON'T buy the expensive stuff, you don't need it, I live in a place that has 110*F summers and I know what I'm talking about!
For the ultimate heat insulation, stick some zero-clearance sheets under your car body (above the tranny and on the lower firewall), I did that to my car and its so cool that I rarely need A/C to cool the cockpit down, except in the mid. summer days of course.
All the other stuff, like the dynamat and hushmate .. etc are really a sound deadening materials, and they very little in preventing heat transfer to the cabin, they do a very good job in preventing noise though.
For the ultimate heat insulation, stick some zero-clearance sheets under your car body (above the tranny and on the lower firewall), I did that to my car and its so cool that I rarely need A/C to cool the cockpit down, except in the mid. summer days of course.
All the other stuff, like the dynamat and hushmate .. etc are really a sound deadening materials, and they very little in preventing heat transfer to the cabin, they do a very good job in preventing noise though.
Does anyone have any real life comparisons between zero-clearance and products like lizardskin?
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Melting Slicks
Joined: Jan 2003
Posts: 2,877
Likes: 13
From: Doha
St. Jude Donor '08
This is the kind of stuff I used :
http://www.randallraceparts.com/otherinsulation.html
A single 42"X48" sheet was enough to do the underside of the cabin.
You can see where I put it in this pic :
http://www.randallraceparts.com/otherinsulation.html
A single 42"X48" sheet was enough to do the underside of the cabin.
You can see where I put it in this pic :
Thread Starter
8th Gear
Joined: May 2011
Posts: 8
Likes: 0
From: Orono Mn
Thanks for the input. My plan is to use the Reflectix for heat and fatmat for sound. Is is correct to put the fatmat in first and then Reflectix. Again, thank you for the help, I will post some pics of my project in time. Doug
Burning Brakes
Joined: Mar 2011
Posts: 969
Likes: 1
From: NJ
This is the kind of stuff I used :
http://www.randallraceparts.com/otherinsulation.html
A single 42"X48" sheet was enough to do the underside of the cabin.
You can see where I put it in this pic :
http://www.randallraceparts.com/otherinsulation.html
A single 42"X48" sheet was enough to do the underside of the cabin.
You can see where I put it in this pic :
Thanks
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The '68/69 C3's has an additional insulation/heat-shield setup that installed on the underside of the footwells for the passenger compartment. If you are doing an 'original' rebuild of the car, you will want to install those; and they will help a lot to reduce heat from the exhaust system.
Reflectix is a good low-cost heat insulation option for your interior. If I were doing a complete refurbish of the car, however, I would use something more permanent. But, make sure it is a heat insulation material and not just a soundproofing/noise reduction product.
You only need such insulation in the forward part of the vehicle--inside of the firewall to (and including) the bulkhead behind the seats. You do not need heat insulation in the storage area. You must cover ALL of the transmission tunnel; that is a primary source for lots of heat.
Reflectix is a good low-cost heat insulation option for your interior. If I were doing a complete refurbish of the car, however, I would use something more permanent. But, make sure it is a heat insulation material and not just a soundproofing/noise reduction product.
You only need such insulation in the forward part of the vehicle--inside of the firewall to (and including) the bulkhead behind the seats. You do not need heat insulation in the storage area. You must cover ALL of the transmission tunnel; that is a primary source for lots of heat.
Drifting
Joined: Jun 2011
Posts: 1,541
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From: iowa city iowa
2020 Corvette of the Year Finalist (appearance mods)
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I did second skin all over the cabin. It is supposed to deaden the sound and reduce heat transfer. I then put Reflectix (or whatever brand Menard's sells) on the forward part of the cabin including the tunnel. That stuff is cheap, thin and easy to work so I didn't see any reason not to add it.
Former Vendor
Joined: Sep 2011
Posts: 77
Likes: 0
From: Mooresville NC
Good morning: I am in the middle of a frame off restoration on my 68. I would like recommendations on which insulation under new carpet people like. Heat is my main consideration, 427, 390HP. I have had good luck with the tunnel insulation under the car but the rest of the under-body insulation, it seems to come off. Thanks in advance for any help. Doug
Instructor
Joined: Feb 2014
Posts: 161
Likes: 26
From: Prague
I was wondering, why Dynamat eXtreme or other butyl or bitumen stuff where there si virtually no resonance in early C3 Vettes, there is no metal. This is what these plates are for. Many guys are suggesting using Dynamat eXtreme and Reflectix.Does it work? Has anyone tried just some foam or some other deadening/heat insulating materials?
Melting Slicks
Joined: Aug 2012
Posts: 3,487
Likes: 83
From: Titusville Florida
This is the kind of stuff I used :
http://www.randallraceparts.com/otherinsulation.html
A single 42"X48" sheet was enough to do the underside of the cabin.
You can see where I put it in this pic :
http://www.randallraceparts.com/otherinsulation.html
A single 42"X48" sheet was enough to do the underside of the cabin.
You can see where I put it in this pic :
