quick question for those that have sound deadend

Just getting round to ordering some sound deadening. Was wondering how many sq/ft is required?
My aim is to do one layer pretty much everywhere except for the roof.
thanks.

I used the Dynamat Extreme Bulk Pack. 36 sq ft and bought a few sheets more to finish up. But that was for a roadster.

ALSO: The first time I bought Dynamat I got what I thought was a reasonable discount from an "authorized dealer" something like 30% off.

Just recently bought some from Amazon online and saved 50% Shipping was free (and you know how heavy the stuff is) and it got here in 5 days.

I have a GT and I used about 80 but I went a little overboard and did everything including the doors, under the dash, inside the trany tunnel, and I tripled up where the driver and passenger feet will be. I also have some left over.

cheers. was thinking I could maybe get away with 28. but I can see i'm going to have to spend a little more.

This took 50... Could've used a couple more sq ft... Would've done the parcel shelf and rear bulkhead too.

Keep in mind this stuff does not provide much thermal protection.

Here's a journal entry on my install,

http://www.mgexperience.net/journal/jmoore/346

How do you install the carpeting over the Dynamat? With a spray adhesive?

I used just short of 40 sqft in a roadster. I did not do the doors. When installing the carpet I used Weldwood contact Gel cement. If you plan on redoing your interior panels also, I would buy a gallon . This stuff works great if you follow the direction on the can. Let it setup for at least 15 minutes. If you are only laying your carpet and not redoing interior panels or having someone else do them a quart will do. You will need a couple cheap 2" paint brushes also. When ordering your Dynamat, most websites advertise a knife to cut this with. Any good razor knife will do. However the roller is very handy. You may be able to get the roller at Lowes or Home Depot cheaper. I don't know I had one that came with a wallpaper kit I found in a used car I bought a long time ago.

A slightly contrarian view on heatproofing-soundproofing with Dynamat like products --

I used Second Skin Damplifier and found it as good as, or better, than Dynamat. There's a website called Sound Deadener Showdown (or something like that) which rated it the best.

You don't need any special tools. These products can easily be cut with any utility knife, though you will have to use some kind of tar remover to wipe the glue off the blade from time to time as it builds up. There is no need for any kind of special roller or other tool to adhere the product. I found the rounded smooth plastic handle of a normal screwdriver worked fine to push the material into corners, etc. You can easily find other tools lying around which will work well. They always want you to buy their special tools. You don't need them.

I recommend at least doubling the material up on the floorboards. It will help with the heat.

I did the battery shelf and the trunk and inside the doors (as much as I could reach).

Don't forget the firewall as high as you can reach. And the transmission tunnel, of course.

As to heatproofing and soundproofing qualities, I'd like to say it's a "miracle" but it's not. Don't get your hopes up too high. It does cut down on heat -- somewhat -- but I can still feel a good deal of heat through the floor from the muffler on the driver's side even with a couple layers or heatproofing -- plus a Moss heat shield attached beneath the car! The transmission tunnel is still moderately hot even though covered with one layer. It does not eliminate heat, by any means. That would take many layers, I'm afraid.

Soundproofing on a roadster just isn't going to work very well, and my car is still very noisy. It may cut down a little on some of the road and suspension noise, but I don't really notice a whole lot of difference, frankly, and I covered every square inch. Claims of dramatic differences may be in the eye and ear of the beholder or a result of the placebo effect. If Dynamat is dramatically better than Second Skin Damplifier, I'd be very suprised as I've used both and they appear very similar -- a rubbery substrate with glue on one side and aluminum foil on the other.

It's fun to do, easy in fact, and only takes a few hours or one leisurely day. I'd do it again, for sure, because it's not that expensive and there are some benefits. But, it's hardly the miracle cure some have suggested for these fairly noisy and hot cars. I may be adding some aluminumized shredded rag insulation on top of what I've got now to see if that helps.
Nevertheless, a small old-fashioned roadster is just going to be hot and noisy no matter what anyone does, I imagine. An MGB-GT may be more likely to benefit more than a roadster.

I also used second skin the stuff is very good.

The previous owner of my 79 roadster (which I recently sold) did the soundproofing in reverse of the pictures shown. He did it with the foil side down and felt side up? It was a foil and dense felt like material it came with no glue on either side but him glueing on the foil side. Seemed to work pretty good actually. The reasoning he claimed was the felt if got wet underneath would be difficult to dry but with it facing up it could dry if carpets removed and the foil would keep the moisture from seeping to the metal. Dont ask me .... but that seemd to make a little sence.

John, the PO did it the right way. You do what the reflective foil towards the head source (exhaust, engine). Having the foil pointed up into the car is ineffective; it provides no insulating value.

Aside from adding sound deading material next to the fire wall, what's the point in covering the entire interior of a roadster? There is no top holding the noise in like there is in a GT. All the noise is road noise coming from around you; outside of the car. Sound deadening material in a GT makes sense because the sound of the engine and exhaust, etc, will reflect off all the hard surfaces that are surrounding you. Riding around in my roadster is so quite compared to my GT, except when there is traffic zipping by.

Dynamat extreme. Bulk pack X2. Amazon has it at half the going price plus free shipping. You just glue your carpets down on it.
Good luck. David

I used something called Press and Seal I bought at Lowe's. It looked pretty darned close to the Dynamat I compared it with. It came in 6" or 8" rolls about 25' long. Took 4 1/4 rolls. For the carpet I found some super-stickey double faced carpet mesh tape at Menards.

Has anyone used this Thermo-tec cool-it? http://www.thermotec.com/cool-it-mat.html It's supposed to provide both thermal and acoustic insulation.

sound deadener-wise you US guys have got it so good. The dynmat bulk pack goes for round £140 over here. The other one i looked into rammat, you've got for $99, we've got for £120.
even the english makes which are'nt imported sell for that sort of price.
makes me sick :moody:

Anyone have experience with fatman advertised on e-bay?

Why do I not have sound and heat problems with my RBB? I never had a heat issue at all and I drive a couple hundred miles at a go.