Upgraded cab insulation discussion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**PbFut** · 10-09-2024, 10:13 PM

Continuing with the fire damage, I ended up stripping the firewall engine side to metal with wire wheel and epoxy prime.
The interior side of firewall got so hot it charcoaled the jute insulation of the center section OEM pad and a bit of the inside cowl jute and a small part of the left pad in area of gas pedal. A question for those who have upgraded the insulation. Was it worth it? Does laying the rubberized material behind the gas tank add any benefit? Floor? The cab is gutted except tank. Now is the time to do the extra insulation if it is worth it. I need to watch my add-ons to this repair or a blown bank account could easily come about. Seems this stuff does add up so I am looking for input.
Thanks for help

**PbFut** · Yesterday, 04:02 PM

No opinions?

**A1971Blazer** · Yesterday, 04:08 PM

I did a build from scratch, so the inner firewall was bare metal. I used Lizard Skin heat coating as well as the sound deadener coating. I also glued on 3/8" thick jute insulation with the foil on both sides, as high as I could get it up under the dash.
I don't have a comparison, but it's cool and quiet.
In your case, if it was me, I would use the self adhesive (Dynamat, Fat Mat, etc) then perhaps add a layer of ¼" jute over that everywhere it was feasible.

LS short box · Yesterday, 04:21 PM

This is what my 68 Cab looked like before the carpet went down. First layer was Hush Mat. Second layer is double sided foil jute insulation. Then the stock carpet. I'm running headers with my LS swaps and I think it really helps.
Also under the cab over the header area I use insulation from DEI. One side is kind of like a dimpled foil. Then in the middle kind of a fiberglass insulation and then super sticky glue to stick it to the sheet metal.

**1970cstblazer** · Today, 07:13 AM

I used Dynamat on my Blazer. It is quieter in the cabin than it ever was!

D.B · Today, 05:28 PM

I sprayed the interior of my 72 C20 with lizard skin sound deadener and also the heat barrier. Then I applied a layer of the Flat Line Barrier. My carpet with jute backing over all of this. Best thing I ever did for the interior of the truck. It is now super quiet and virtually no floorboard or firewall heat from the exhaust or engine. I run headers with 3" exhaust and 40 series flow masters. No problem talking to anyone and I don't have to crank the radio up to listen to it.

**PbFut** · Today, 07:04 PM

Really good input. The lizard skin product under the dynamat sounds like a really nice way to go. I would be looking at 500 plus for the lizard and gun and another 250 for the dynamat. Then the jute and carpet. I am not sure I want a Cadillac truck relative to noise isolation. Heat is more my issue. I prefer engine over music noise anyway.

10-09-2024, 10:13 PM	#1
PbFut Senior Member Join Date: Feb 2022 Location: Ca Posts: 562	Upgraded cab insulation discussion Continuing with the fire damage, I ended up stripping the firewall engine side to metal with wire wheel and epoxy prime. The interior side of firewall got so hot it charcoaled the jute insulation of the center section OEM pad and a bit of the inside cowl jute and a small part of the left pad in area of gas pedal. A question for those who have upgraded the insulation. Was it worth it? Does laying the rubberized material behind the gas tank add any benefit? Floor? The cab is gutted except tank. Now is the time to do the extra insulation if it is worth it. I need to watch my add-ons to this repair or a blown bank account could easily come about. Seems this stuff does add up so I am looking for input. Thanks for help

Yesterday, 04:02 PM	#2
PbFut Senior Member Join Date: Feb 2022 Location: Ca Posts: 562	Re: Upgraded cab insulation discussion No opinions?

Yesterday, 04:08 PM	#3
A1971Blazer Senior Member Join Date: Nov 2013 Location: East Tennessee Posts: 2,175	Re: Upgraded cab insulation discussion I did a build from scratch, so the inner firewall was bare metal. I used Lizard Skin heat coating as well as the sound deadener coating. I also glued on 3/8" thick jute insulation with the foil on both sides, as high as I could get it up under the dash. I don't have a comparison, but it's cool and quiet. In your case, if it was me, I would use the self adhesive (Dynamat, Fat Mat, etc) then perhaps add a layer of ¼" jute over that everywhere it was feasible. __________________ 1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............

Yesterday, 04:21 PM	#4
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 2,082	Re: Upgraded cab insulation discussion This is what my 68 Cab looked like before the carpet went down. First layer was Hush Mat. Second layer is double sided foil jute insulation. Then the stock carpet. I'm running headers with my LS swaps and I think it really helps. Also under the cab over the header area I use insulation from DEI. One side is kind of like a dimpled foil. Then in the middle kind of a fiberglass insulation and then super sticky glue to stick it to the sheet metal. Attached Images

Today, 07:13 AM	#5
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,582	Re: Upgraded cab insulation discussion I used Dynamat on my Blazer. It is quieter in the cabin than it ever was! __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

Today, 05:28 PM	#6
D.B Registered User Join Date: Jul 2021 Location: Keller, Texas Posts: 493	Re: Upgraded cab insulation discussion I sprayed the interior of my 72 C20 with lizard skin sound deadener and also the heat barrier. Then I applied a layer of the Flat Line Barrier. My carpet with jute backing over all of this. Best thing I ever did for the interior of the truck. It is now super quiet and virtually no floorboard or firewall heat from the exhaust or engine. I run headers with 3" exhaust and 40 series flow masters. No problem talking to anyone and I don't have to crank the radio up to listen to it. __________________ Darrell 1972 Cheyenne Super C20 (My Fun Drive) 2000 S10 Xtreme (My Drag Truck)

Today, 07:04 PM	#7
PbFut Senior Member Join Date: Feb 2022 Location: Ca Posts: 562	Re: Upgraded cab insulation discussion Really good input. The lizard skin product under the dynamat sounds like a really nice way to go. I would be looking at 500 plus for the lizard and gun and another 250 for the dynamat. Then the jute and carpet. I am not sure I want a Cadillac truck relative to noise isolation. Heat is more my issue. I prefer engine over music noise anyway.



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