1967 Sound Deadening / Insulation Mats

[Kenny H.]

During an upcoming restoration I intend to add some sound deadening and thermal insulation to my 1967 Coupe. I'm still in the process of determining what products to consider, so I'm looking for some recommendations. I'm considering a spray-onproduct (like Lizardskin), installing one of the many mat type products (Dynamat, HushMat, etc.), or maybe even using both a spray product then installing a mat product over that.

Any recommendations? Anything to completely avoid? Thanks.

[Donald H.]

Re: 1967 Sound Deadening / Insulation Mats

There was a Restorer article sometime in 2009 by Gary Chestnut. If the do a search on Hushmat you will find references to the article. He compared a few of the products and recommended Hushmat

[Patrick H.]

Re: 1967 Sound Deadening / Insulation Mats

https://www.sounddeadenershowdown.com/

http://www.diymobileaudio.com/forum/member-reviews-product-comparisons/146403-sound-deadening-cld-testing.html

I've been researching for a while what I will want to use on the non-Corvette I own.

The first link above shows how to install the various materials, and the key here is that the typical sound deadening mat (Dynamat, Hushmat, etc) doesn't have to be installed over everything, only helps with low frequency sounds, and doesn't do much for heat.

The second link is a long, extensive test of materials. Go to the last page for a recap, if you wish.
Here it is:

http://www.diymobileaudio.com/forum/3522882-post1725.html

I've learned a LOT about sound materials from these two sites.

[Bruce B.]

Re: 1967 Sound Deadening / Insulation Mats

Dynamat Extreme is the only way to go as far as I am concerned.
Put in in my 62, 57 and Dynamic Control (manufacturer of Dynamat) installed it in my 65 for test fit purposes.
Best price is on line, Amazon, etc.

[Gene M.]

Re: 1967 Sound Deadening / Insulation Mats

Sound and heat mat sold by Amazon seems same as expensive name brands. Goes on just as easy too.

https://www.amazon.com/Noico-deadeni...JD6378SYA3Q045

[Gary J.]

Re: 1967 Sound Deadening / Insulation Mats

Go to www.Fatmat.com I am thinking about using Rattletrap insulation on this '67 I am doing. I have a friend that used it in a '67 Chevelle and he was very well pleased with it.

[Kenny H.]

Re: 1967 Sound Deadening / Insulation Mats

Thanks for all the replies. I'll take a look at the suggested sites and documents; lots of great information here.

[Mark E.]

Re: 1967 Sound Deadening / Insulation Mats

I installed Dynamat products in my '70, which made a huge difference with heat.

Two layers were installed. First a thin foil-backed tar like material was stuck to the inside of the floorpan. This is primarily for sound. Then a thicker closed cell product was stuck down as a heat insulator. This product comes in three thicknesses (as I recall; it's been over a year); I chose the thickest which is 1/2". Each product has a peel off self-stick backing. Dynamat's documentation explains that these two products are designed to work together for maximum heat and sound reduction.

In my case, results were dramatic. Before, radiant heat through the floorpan was unbearable. During road trips, passengers would place bags of ice near their feet for some level of comfort. As the driver, I would just suffer. With Dynamat installed, heat insulation is as good, if not better, than a normal, modern car. I can feel some warmth if I reach down and place my hand firmly on the carpet.

Understand that there are two primary sources of heat in a cockpit: Radiant and convected (hot air). Products like Dynamat will reduce radiant heat, but reducing convected heat requires hunting down all the sources of air leaks in the cowl and ducting. I achieved good result by tackling both.

[Mark E.]

http://www.dynamat.com/automotive-an...e-restoration/

[Bob W.]

Re: 1967 Sound Deadening / Insulation Mats

Ken Paragon sell koolmat and I think it's pre cut to fit.

Bob