Dynamat Sound Deadening alternatives??
 

Often times we get requests to install a sound deadening material (Dynamat) and foil insulation behind the upholstery to help with combatting noise and heat. The costs to install Dynamat is beyond expensive these days. Can anyone recommend a product they have used that they feel is equal to or better than the 18"x32" sheets that Dynamat sells?

Re: Dynamat Sound Deadening alternatives??
 

What part is expensive, the materials or labor to install them? The sheets/material cost seems reasonable to me.

Re: Dynamat Sound Deadening alternatives??
 

I insolated my garage with a product just like this. It was a bubble wrap with foil meant to be used in chicken houses where the humidity is high. It was cheap and made in America. Sorry I don't remember a name. Maybe check with a pole barn installer?

Re: Dynamat Sound Deadening alternatives??
 

Brent,

I have been using "FatMat" on the last 3 cars I did. I buy it off of ebay & feel it is just as good as Dynamat without paying for the name.

God Bless & Merry Christmas
Bill
https://www.jalopyjournal.com/forum/...closed.614419/

Re: Dynamat Sound Deadening alternatives??
 

B-Quiet.com

They sell top quality sound deadening and heat reducing materials. Check them out. No, I have no affiliation to them other than I bought both material types to help with noise and heat in the cab of my John Deere mower.

Re: Dynamat Sound Deadening alternatives??
 

Looks like in comes in a couple of thickness, 50 mil and 80 mil, which do you use.?

Re: Dynamat Sound Deadening alternatives??
 

I've got this stuff in a few cars including my '31 truck. It is top shelf for sure:
https://www.designengineering.com/
Great for heat and sound.
If you want to call them, ask for Mike, you'll get personal service and a TON of knowledge.

Re: Dynamat Sound Deadening alternatives??
 

My car had that under the floor mat. Useless once all the bubbles popped. Maybe OK if glued into a door.
Try these - you can figure out the sq in cost since they are different sizes.


https://www.homedepot.com/pep/39-4-i...CABEgKFRvD_BwE


https://www.summitracing.com/parts/r...iABEgK6cPD_BwE

Re: Dynamat Sound Deadening alternatives??
 

What about 3M body Schultz or equivalent? I’ve used it before quick and reasonable.
Downside is if you want it gone. It’s basically a hardening undercoat

Re: Dynamat Sound Deadening alternatives??
 

I use the 50 mil, I figure because I always use Jute/Insulation before the carpet it would be plenty. It makes the interior quieter & more comfortable. I have done 3 cars with it & in the near future will be doing three more.

I have also used it around trans lines, fuel lines & starter harnesses that are close to exhaust manifolds/headers.

God Bless
Bill
https://www.jalopyjournal.com/forum/...closed.614419/

Re: Dynamat Sound Deadening alternatives??
 

I go to lowes and buy the roll of air duct insulation. It's self adhesive with a silver backing.
I've used it on about 10 Model As and my VW DC.
It's ez to work with and it works.

Re: Dynamat Sound Deadening alternatives??
 

Attachment 578619This is the sound damping and thermal insulation I put into my Victoria.

Re: Dynamat Sound Deadening alternatives??
 

Here is the article I wrote for the above Post 12.

Re: Dynamat Sound Deadening alternatives??
 

Great article Bob.

I have been investigating this for my '30 Tudor.

Courtesy of Google AI, sound deadening (soundproofing) effectiveness is primarily determined by four key factors: mass/density, decoupling, absorption, and sealing air gaps. I googled "What are the factors that affect sound deadening" and the answer seems consistent with my knowledge in this area.

Regarding the mass factor, I have found plenty of cheaper 80mil Butyl sound deadening products on Amazon that are probably good enough for a Model A. The heavier Butyl rubber products would work for the inside of the vehicle doors and panels and other products would probably work well for the floors (waterproof, closed cell foam with heat reflective backing).

Above my muffler I have already installed 1/8" Aluminum sheets underneath the floor boards to reflect that heat.

Re: Dynamat Sound Deadening alternatives??
 

I can't find that type on the Lowe's website. Can you post the SKU number or more info?

Re: Dynamat Sound Deadening alternatives??
 

I've used a combination of Dynamat and Roadkill. Roadkill seems to work just as well and is less expensive than Dynamat.

Re: Dynamat Sound Deadening alternatives??
 

This thread actually reminded me that I needed to reorder some! This is what I use.

https://www.ebay.com/itm/225832559507

Will be doing the 67 Marlin probably next week & then the 67 Toro as time permits.

God Bless
Bill
https://www.jalopyjournal.com/forum/...closed.614419/

Re: Dynamat Sound Deadening alternatives??
 

Thank you for the link 👍

Re: Dynamat Sound Deadening alternatives??
 

You can get rolls of this at Lowe's or Home Depot. I glued it in the side panels of my Tudor without a lot of fuss. I also insulated the interior of a 51 DeSoto with it. Black car with a huge top. It definitely made it cooler inside afterwards!

Re: Dynamat Sound Deadening alternatives??
 

Lowe's stk 28929 made by Frost King
Duct insulation $27.00

Re: Dynamat Sound Deadening alternatives??
 

Thanks everyone!! I am going to explore some of these recommendations.



Your point is valid about it being labor intensive to install it. Especially when you factor in the amount of time it takes to accurately measure, cut that gummy stuff, and then install it neatly ...especially beside & behind the upper portions of the Body where it is needed the most.

Re: Dynamat Sound Deadening alternatives??
 

I bought a kit of the black gummy stuff that was pre-cut and installed following their map, the different shapes and sizes didn’t completely cover the panel, just the right amount to deaden the panels. That was 30 years ago and I don’t recall the company, I probably purchased from one of the model A suppliers.

Re: Dynamat Sound Deadening alternatives??
 

Thanks!

Re: Dynamat Sound Deadening alternatives??
 

This is a common misunderstanding of how to use the sound deadening materials.

You do not need to cover 100% of the metal surface to get a good improvement. Anything around 75% coverage gets you the benefit. Above that you reach the point of diminishing returns.

So you can save on materials, but even more on labor, by just cutting pieces that cover the larger areas and stop there.

The dense tar/metal mat is designed to reduce "drumming" of the metal. Think of a large sheet of metal that you hold up by the corners and vibrate to make a "thunderstorm" sound. That drumming is what you are reducing by adding this sticky metal mass. The full sheet does not need to be covered to stop the drumming.

But to reduce sound and heat in your car, you can't stop with the sticky metal stuff, because that only reduces drumming. You have to put a layer of sound and thermal insulation on top of that.

The people that make DynaMat (the sticky stuff with a metal layer) also sell a self-adhesive insulation called DynaLiner to go on top of the Mat. The Liner comes in 3 thicknesses, up to 1/2" thick. This stuff, on top of the Mat, really deadens sound and reduces heat transfer. It sticks to the Mat and stays there. Here you DO want to shoot for close to 100% coverage.

There are probably other suppliers of equivalent stuff. Use the thickest Liner that will fit in the space you have on top of the Mat (behind interior trim panels, etc., out of sight). The two combined really kick it.

Under my front and rear floor mats, I use a non-adhesive sheet called DynaPad. It is only 3/8" thick and it is super sound and heat deadening. No sticky metal layer, no self adhesive anything. The DynaPad is dense and lays down flat under the car's front and rear mat or carpet. Easy to remove to work on the car. No one knows it's there, but it is super effective at reducing noise and heat.

It is not cheap, but you get what you pay for.

Re: Dynamat Sound Deadening alternatives??
 

That’s why I asked, the various alternatives are relatively the same cost wise. I see the labor being the differential factor. All of the do it yourself people don’t take their time into the cost of things. Commercial, for profit entities have to!

Re: Dynamat Sound Deadening alternatives??
 

I just finished up laying the "FatMat" on the floor of the 67 Marlin & figured I would show it before I lay the padding & new carpet down.

God Bless
Bill
https://www.jalopyjournal.com/forum/...closed.614419/