Firewall insulation question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**FL71C10** · 02-08-2015, 02:12 PM

What are you guys doing for firewall insulation? If you do the dynamat or Fatmat, do you go all of the way up the firewall and skip the factory style jute padding?

Thanks.

John

5567Cruiser · 02-08-2015, 02:23 PM

I put Dynamat and the foil insulation from menards all the way under the dash and then removed the Jute backing from the stock firewall padding as it is way to thick with Jute attached. I used the 3M super adhesive and applied the stock cardboard backing with glue last. I have a Vintage Air system but it was just installed and haven't had time to test yet, but I think I will have sound deadening as well as insulation. Just an idea- good luck!

**Tom Vogel** · 02-08-2015, 06:22 PM

Quote:

Originally Posted by 5567Cruiser

I put Dynamat and the foil insulation from menards all the way under the dash and then removed the Jute backing from the stock firewall padding as it is way to thick with Jute attached. I used the 3M super adhesive and applied the stock cardboard backing with glue last. I have a Vintage Air system but it was just installed and haven't had time to test yet, but I think I will have sound deadening as well as insulation. Just an idea- good luck!

^^^^ This

Lee H · 02-08-2015, 02:27 PM

I used dynamat and a repop of the cardboard/jute padding.

**FL71C10** · 02-08-2015, 02:45 PM

So the dynamat by itself probably isn't enough?

5567Cruiser · 02-08-2015, 03:38 PM

My understanding is that Dynamat is just a sound deadener and not a good insulator. I live in Minnesota with extremes of temperature so need insulation also. If you have A/C or will install in the future than they are a lot more efficient with lots of insulation although a cab is not a large area.Maybe some other members will have some good ideas.

02-08-2015, 02:12 PM	#1
FL71C10 Senior Member Join Date: Jun 2010 Location: Orlando, Florida Posts: 2,508	Firewall insulation question What are you guys doing for firewall insulation? If you do the dynamat or Fatmat, do you go all of the way up the firewall and skip the factory style jute padding? Thanks. John __________________ 71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now.

02-08-2015, 02:23 PM	#2
5567Cruiser Registered User Join Date: Jun 2011 Location: Cannon Falls,Minnesota Posts: 99	Re: Firewall insulation question I put Dynamat and the foil insulation from menards all the way under the dash and then removed the Jute backing from the stock firewall padding as it is way to thick with Jute attached. I used the 3M super adhesive and applied the stock cardboard backing with glue last. I have a Vintage Air system but it was just installed and haven't had time to test yet, but I think I will have sound deadening as well as insulation. Just an idea- good luck!

02-08-2015, 02:27 PM	#4
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,144	Re: Firewall insulation question I used dynamat and a repop of the cardboard/jute padding. __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

02-08-2015, 02:45 PM	#5
FL71C10 Senior Member Join Date: Jun 2010 Location: Orlando, Florida Posts: 2,508	Re: Firewall insulation question So the dynamat by itself probably isn't enough? __________________ 71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now.

02-08-2015, 03:38 PM	#6
5567Cruiser Registered User Join Date: Jun 2011 Location: Cannon Falls,Minnesota Posts: 99	Re: Firewall insulation question My understanding is that Dynamat is just a sound deadener and not a good insulator. I live in Minnesota with extremes of temperature so need insulation also. If you have A/C or will install in the future than they are a lot more efficient with lots of insulation although a cab is not a large area.Maybe some other members will have some good ideas.



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