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I about have all my Dynamat Xtreme down on the floor of the Firebird and would like to put the rubber underlayment down over top to help control the heat better.
When I looked up the parts, I notice the venders sell a rubber or tar paper underlayment for a 67-69 Firebird. Anyone know which would be better and what the difference is?
The paper back tar paper $15 more but I guess that don't always mean it better.
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The tar paper one is stock. Other than that, not much difference.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold  1980 T/A SE Bandit - Sold
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Do you think the rubber is thicker or better for heat? Maybe I should just use Dynaliner over it. It may better then either one.
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The Dynamat should be fine by itself, plus if you add another layer, you may have some issues with carpet fitment.
-Jeff
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IMO if you have the Dynamat down already then there is no need for the factory tar matts.
I used an equivalent product and still had heat coming through the floors with the big 455 and 2.5 X cross over exhaust.
So I would either throw a layer of Jute, a thermotech blanket or a sheet of foam over the top before carpet. I found a roll of 1/4 foam at Sears that is meant to go under a treadmill that I might try for one of my cars.
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The Dynamat is pretty thin so there should be plenty of room for the rubber underlayment or maybe a 1/8 or 1/4 Dynaliner.
The dynamat is more for vibration and sound and only helps a little with heat. They recommend adding the Dynaliner for heat issues. It comes in 1/8. 1/4 and 1/2.
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I think the Dynaliner is a good plan.
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I found a guy on performance years and he had put down Dynamat Xtreme and then 1/4 dynaliner with out any issues with the carpet fitting. This would have the thickness at about 5/16.
went ahead and ordered two rolls to try. I think I will dry fit the carpet and see how it is fitting.
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Let us know Harold how that works out and please take and post some pics of the install of both layers. I am very interested in this as I am also looking at doing the same.
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I got the Dynamat Xtreme, 1/4 dynaliner and carpet finished over the weekend. All of this was very time consuming. When I first thought about installing carpet my thoughts were it could not take that long to do it. Boy was I wrong.
The Dynamat Xtreme and the 1/4 dynaliner thickness was no issue under the carpet. Matter of fact it seems my carpet from trim parts was quite big especially over the tran tunnel.
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Some photos of the carpet install. The carpet is bulky around the trans tunnel and the passenger side. I hope it relaxes some but the backing attached to the carpet seems to be making it not lay perfect.
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Hey Harold, that looks good man! Thanks for sharing the pics. What did you use across the front of the firewall?
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I put up dynamat extreme and then used an original repro firewall mat.
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Nice to know, thanks Harold!
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Harold, did you buy the dynamat and dynaliner each as a kit or did you buy little by little? Looking for the best prices on this stuff.
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These are two different kits, but are they both different physically also, and one is for the trunk? So you used two different ones for the floors and firewall? Just wondering why?
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It's the same product just two different size kits. The extreme bulk had 9 sheets . I bought that fist and ran out. I needed about 4 more sheets to finish so I bought the trunk kit because it only had 5 sheets. It was cheaper and did not want to throw away about 30 dollars to buy the bulk kit.
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OK, I understand now. Thanks Harold!
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Excellent write up Harold. I am ordering the same today. Does anyone have any concerns about putting the dynomat in the doors?
Gordy
1968 Firebird 400 4 Speed
68FB400
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I put some in the door. I did not cover the hole inside but did do a big section with some I had left.
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Thank you so much for taking time to document and share your installation. I was thinking about doing the same thing and this really helps.
Dennis
Thanks,
Dennis
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Harold, did you reinstall the seats yourself? I was wondering if you had a hard time with the back seat. Mine went in but after installing the sound dampner it was a pretty tight fit.
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The upholster put mine back in. He did not say there was an issue.
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Ah, ok. I don't suppose he would.
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