Firewall sealant/insulation? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tim Rich · 09-04-2002, 10:38 AM

Greetings,

I saw a mention on an A/C topic about adding insulation to the firewall to help the A/C keep the cab cool. My A/C has to work hard to cool my cab once the engine starts throwing off some heat.

For those of you who've added insulation to your firewall or sealed it, how'd you do it and what did you use?

Thanks.

Low69CST · 09-04-2002, 12:52 PM

I used Dynamat Xtreme to line my cab and firewall. It was very expensive, cost me about 500 bucks. But as far as sound protection it amazed me how much it cut down sound. I haven't had any heat tests yet, but i have seen tests down at shows and demonstrations. It looks like really good stuff, if you can afford it I think it do great in your truck.

JimKshortstep4x4 · 09-04-2002, 01:19 PM

In addition to sealing the outside before painting I installed 1/2" thick insulation on the inside using spray adhesive to hold it in place. The insulation that I used is made for newer GM vehicles and is used in the headliner area. It looks like thick felt, is fire
resistant, and has excellent insulating qualities.

Jim

Tim Rich · 09-05-2002, 12:36 PM

Jim,

Is the newer GM insulation a dealer item or were you able to get it from a parts house or mail order?

Thanks,

Tim

JimKshortstep4x4 · 09-06-2002, 09:09 AM

I will get you the information on the material.

Jim

johnnyp · 09-06-2002, 01:57 PM

I used RAAMmat. It's the same material as Dynamat but at a fraction of the cost. I got way more than enough to do the cab floor, firewall, and door panels for less than $80, including shipping.

JimKshortstep4x4 · 09-09-2002, 09:09 AM

I got my insulation from a specialty house that is no longer in business, (sorry, I just found out).

The material johhnyp used looks pretty good and it was cheaper
than what I had to pay.

Jim

09-04-2002, 10:38 AM	#1
Tim Rich Registered User Join Date: Apr 2002 Location: Kennesaw, GA Posts: 56	Firewall sealant/insulation? Greetings, I saw a mention on an A/C topic about adding insulation to the firewall to help the A/C keep the cab cool. My A/C has to work hard to cool my cab once the engine starts throwing off some heat. For those of you who've added insulation to your firewall or sealed it, how'd you do it and what did you use? Thanks. __________________ Tim Rich Kennesaw, GA 72 Stepside 65 Must@ng

09-04-2002, 12:52 PM	#2
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	I used Dynamat Xtreme to line my cab and firewall. It was very expensive, cost me about 500 bucks. But as far as sound protection it amazed me how much it cut down sound. I haven't had any heat tests yet, but i have seen tests down at shows and demonstrations. It looks like really good stuff, if you can afford it I think it do great in your truck. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

09-05-2002, 12:36 PM	#4
Tim Rich Registered User Join Date: Apr 2002 Location: Kennesaw, GA Posts: 56	Jim, Is the newer GM insulation a dealer item or were you able to get it from a parts house or mail order? Thanks, Tim __________________ Tim Rich Kennesaw, GA 72 Stepside 65 Must@ng

09-06-2002, 01:57 PM	#6
johnnyp Keepin' It Stock Join Date: Aug 2001 Location: Grand Island, Nebraska, USA Posts: 554	I used RAAMmat. It's the same material as Dynamat but at a fraction of the cost. I got way more than enough to do the cab floor, firewall, and door panels for less than $80, including shipping. Attached Images __________________ 72 Sierra Grande - Maych Forget about "do it right the first time". Do it wrong the first time to learn how, then do it right the second time.

09-04-2002, 01:19 PM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	In addition to sealing the outside before painting I installed 1/2" thick insulation on the inside using spray adhesive to hold it in place. The insulation that I used is made for newer GM vehicles and is used in the headliner area. It looks like thick felt, is fire resistant, and has excellent insulating qualities. Jim

09-06-2002, 09:09 AM	#5
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I will get you the information on the material. Jim

09-09-2002, 09:09 AM	#7
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I got my insulation from a specialty house that is no longer in business, (sorry, I just found out). The material johhnyp used looks pretty good and it was cheaper than what I had to pay. Jim



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