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Dynamat in the doors

norvalwilhelm

Well-known member
Joined
Apr 20, 2004
Messages
396
Location
Waterloo, ontario
Corvette
75 blown bigblock
I broke down and got another 24 square feet. I already had used 36 square feet. I used a good part of it in the battery boxes. While I didn't intend to do the boxes/storage bins I could not do half the job.
I also pulled one door panel off, removed the inspection cover at the bottom of the door and covered the lower 1 foot of the door with dynamat. I also did part of the inside of the door.
I have a source for 12 inch wide duct insulation and have 45 square feet on order for Friday. I will put that over all the dynamat and then the new rugs. The doors will get a generous coating over the dynamat too and after the inspection cover is replace I will cover that too.

How does it work?? While only the lower 1 foot is covered, the inspection cover is off leaving a big hole but the difference is really noticable.
I rapped on the outer door skin with my knuckles and the door with the dynamat really sounds solid while the other one is really hollow.
No comparison at all and the door is only partly finished.
I think it is going to be well worth the effort doing the doors.
I was at the Cascar shop on Monday and looked under the race car and a good part is covered with the duct insulation. I asked Roger about it and he does it for heat. The headers pass under the tunnel out the passengers side and really heat the tunnel. This stuff really keeps it alot cooler and he claims will not burn no matter what.
It comes in 12 inch x 15 foot rolls for $22. CDN. I bought 3 rolls and will use most of it over the dynamat.

Also a good article I read claims that the doors are the major source of noise. Even closing a well insulated door sounds different, more solid, more expensive.

I have no pictures now because I am waiting for the duct insulation but will take pictures on the weekend and repost on how I did it and how it turned out.
 
It really does make a big difference. I am doing the entire inside of the door skin and again under the door panel on both doors. I have them off and completely gutted, so it's not a difficult job at all. I'm doing it in an attempt to lessen the noise from the sidepipes. I love the sound of them, but every now and then it would be nice to just roll up the window and escape the volumn. Plus it makes the stereo sound great!
 
Thumper what are you using. I started with dynamat and will cover that with Frost King a Duct insulator.
 
I'm using something I found on eBay called FatMat. It's just like Dynamat, but costs $100 for 100sf. It's not as thick as Dynamat, but the answer to that is to do two layers. Over that I have some foil backed insulation that I picked up at a swap meet that I'm using on the firewall and floors.



:bang :bang :bang :bang :bang
 

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