How many sq. ft. needed for sound proofing coupe?
 

getting ready to do some sound proofing this week came across a good product aircraft closed cell foam. very lightweight

: SOUNDPROOFING & More Soundproofing! Super Soundproofing Co.

so i have been reading it is like 50sq ft. to do the car can someone confirm that with me, it would be much appreciative....

I used something that is much easier than foam or asphalt and it works better than Dynamat. It is a water based non-toxic material that you brush on. It is called Quiet Car...
Noise Damping Technology for Cars, SUVs, Trucks, RVs, and Other Vehicles

Ive done three early 911"s with full dynamat. 72 square feet was perfect.

I was just getting ready to ask about Quiet Car. Can you share some details and impressions?

proofing
 

yeah i looked at that also but thats like bare metal application and you have to prep it before hand primer and all. came across this other sound proofing that they use in airplanes very lite weight

Soundproofing Foams

its a mixture of foam and and mass loaded vinyl combine already with the pca adhesive it acts as a sound deadener like dynomat so its all rulled up into 1. working with one of the guys over there. so ill post some info if i got that way..

if not dynomat

Sound Deadener Showdown - Your Source for Sound Deadening Products and Information

some very good info there and don is more than happy to discuss your wants and needs as well as help you buy the right amount of product.

Sound proofing a 911 coupe......
 

Just did my SC. It took 11 sheets of dynamat that were 18"x32" in size. Everything was measured and cut carefully so there was almost no waste. This included the rear window tray, back seat area, floor up to the pedals and inside rockers. I bought a pack of 9 sheets and had to buy two more to finish. Very pleased with the results.

kinein,

I used Super Soundproofing for some of my car. For the floor I used Mass Loaded Vinyl (1/8") with 1/4" closed cell foam backing. It does help to muffle out road/tire noise. Sorry, I can't remember how much I used. Mass Loaded Vinyl is not very light but if you add it behind some of the rear panels it will help reduce some noise back there as well - no it will never be a Lexus or even a 996. Don't rip out what you already have back there just lay the MLV on top of it (under the panels, cut to fit) - you will notice a difference.

Weight wise you'll probably add about 20 to 25 pounds. I know a lot of people are fanatic about weight but that's about four gallons of gas and I sure can't tell the difference in four gallons.

im not worryn about weight, so you have used there product out of san marcos, ca right? it would be nice to know how much you used i was thinkin about using there product but not sure about it yet....its that or dynomat or something similiar. i am not tryin to do the entire car but enough though let me know little bit more what you think of the super soundproofing

Kinein,

Yep, the place in San Marcos. For the floor I did not use any Dynamat for sound deadener, Porsche put sound deadener on the floor already. Mine was perfectly intact. If yours is crumbling or peeling up, then you should remove the rest of it and then put down Dynamat (or Damplifier Pro, a similar product). After that put down the MLV with 1/4" closed cell foam. It is sold by the foot (48" wide). Four feet should cover your floor, use the 48" as your length and about 19 or 20 inches in width (per side). Make a paper template first, you'll have four sections, two fronts and two rears. It was simple to do and I did notice a difference over rough pavement.

I found that most of the noise comes from the rear compartment, so you'll want to put something back there as well.

interior is bare, i think that it would be less money using the super soundproofing, so you sayin the floor of the car is 16sq ft thats from the peddles to the floor of the back seats?

Yes, purchase four feet of their 48" MLV with 1/4" closed cell foam. It will ship to you in a roll. You don't say what year your car is but at least on the SCs and Carreras ther is a little "hump" under the seats which does not get covered. You may have some electrics under there as well. *Does not include the tunnel area*.

12

Are you suggesting to lay MLV over the moulded asphalt-like panels in the rear, then glue the carpet back over the top of that?

In the rear compartment, you have the rear shelf, the seat bottoms and the rear quarters. I would leave the seat bottom insulation in place and as-is. This way you can leave the carpet alone as well.

Behind the quarter panels there is some sound insulation that Porsche put there, leave it. Over that you can cut and fit 1/8" MLV and then put the quarter panel back.

On the rear shelf leave the factory sound mat in place. I removed my rear speakers because they were shot (and heavy). Over the top shelf where the speakers were I put 1" closed cell foam and then over that and the factory sound mat (sandwiched at the top portion) I put down 1/8" MLV and then the interior trim back.

This did make a noticeable difference in the cabin along with insulation on the floor. Everybody likes to rip out the original sound mats but I found they actually did a pretty good job, a little extra can actually help.

It will never be a Lexus, and there is a small weight penalty. As I mention above perhaps 25 pounds, or about the weight of four gallons of gas.

you don't need 100% coverage with a cld like dynamat xtreme of second skin damplifier pro, only 25-40%. with the foam and mlv you need 100% coverage. a good mlv will be approx. 1lb/square foot. here is how i did the floor in damplifier pro in my sc:

http://i15.photobucket.com/albums/a3...r/100_5718.jpg
http://i15.photobucket.com/albums/a3...r/100_5717.jpg

even with this i went a bit overboard but i had lots of damp pro left over and since i had it all bare anyway....

yes, put dampening material in the center of each panel - cover 1/4 of the area - test before & after by rapping on it to see if it vibrates "much"

put a skin of material over that

you can use a ceramic micro-bead material to absorb sound

remove existing material to save wt. - note the wt. is in the rear so think about that..

well my car is gutted out, from the rebuild....so i got 36sq ft. of ballistic for $135. also gettting 1/8mass vinyl attached to 1/4 foam for the rest of the car. the guy doin my interior is puttin it all in for me. before i got the wires run for the stereo and then he is goin to install the rest of the interior after the stereo is in. pictures to follow in a few days.

somewhere buried deep in the Pelican gut is a great pic of a blue car showing where to put dampener

bet it would be hard to find but if you did find it you could just show it to your installer

headliner and my ballistic (dynamat) is laid down pictures soon to come.