Sound Deadener

[85/345]

I am putting new carpet around the pilot, co-pilot and doghouse and was wondering if I should use sound deadener or just plain old carpet padding. Don't really know if the sound deadening insulation will make that much difference. I am looking at Dynamat and from what I've heard it works pretty well. Has anyone had experience with this stuff? Is it worth the extra money? If you have any other ideas let me know.

Thanks,
Brian

[87MH]

Brian:

You may want to visit this thread:

http://www.airforums.com/forum...ad.php?t=15091


When I pulled up my old carpet there was no padding under it in the pilot/copilot area - I installed the new carpet with a good quality commercial (heavy density) foam pad (except for the doghouse - left the original carpet on and covered it over).

[thenewkid64]

I also redid my carpet in my MH. I padded the floor in the cockpit with a high quality pad as well as the carpet. I added the heat and sound insulation under the lid of the doghouse, 2 layers thick. I also added additional padding between the steel of the doghouse cover and the wood underlayment of the cover with carpet on top.

It sounds like a lot of work, but I can tell you that you can have a normal voice conversation with your passenger like you would in your daily driver. That makes long drives easy and less stressful.

[IceKing02]

85/345,

I am, this very night, putting together my truck after taking apart the doors, floors and everything not nailed down. I put in two layers of B-Quiet Extreme and one layer of V-comp. I'll tell you in the next couple of days if it is the "bank vault" that it already appears to be. Conversation in a low voice has not been an option prior to this modification. The website for this product is www.b-quiet.com and it was quite easy to order, ship and install. I can only tell you right now that my doors close with an authoritative THUNK, as if they are solid steel. Kinda cool...

[mcneon]

I'd highly recommend checking out some of the high-tech insulating materials. These tend to be expensive, but they're very effective and thus worth the cost, IMHO.

The B-Quiet site has some good products. I chose one from J. C. Whitney, their P/N ZX158488B, and I've been very pleased with the results. It insulates against heat as well as noise. I used this same material to line my generator compartment, and it's very quiet.

It seems that now I actually get more engine noise through the floorboards and firewall than from the doghouse. I'm in the process of recarpeting the front compartment, and I intend to use the same material as a carpet pad, at least on the sheet metal parts of the floor.

Bob

[74Argosy24MH]

Originally Posted by mcneon

I'd highly recommend checking out some of the high-tech insulating materials. These tend to be expensive, but they're very effective and thus worth the cost, IMHO.

I used the same material and with the same results, more noise now from the floor and firewall than engine. The only time I really hear the engine is when the fan clutch kicks in.

For the floor and firewall I think the way to go is spray insulation because of the irregular shape. I used some spray ceramic heat insulation on my inner roof and the temperature reduction was amazing.

John

[driftwood]

Who can be more particular than expensive yacht owners?

In the U.S. Mega-Yacht industry the leader in sound reduction technology can be found here: http://www.soundown.com/

No doubt your 'Land-Yacht' is worth it!

[87MH]

Originally Posted by 74Argosy24MH

....... used some spray ceramic heat insulation on my inner roof and the temperature reduction was amazing.

John:

Do you have a make or website for the ceramic spray?

That's a new one on me.

THanks,

[74Argosy24MH]

You betcha. It ain't cheap, and has gone up since I got it even. It has to be something repackaged because I couldn't find it anywhere else under that name.

http://www.partsexpress.com/pe/showd...number=268-232

It really works. I made the inner roof above the cab and had it laying outside in the sun. It was so hot I could hardly touch it to bring it inside. Sprayed it, put it back outside and the bottom was barely warm.

John

[85/345]

I have been looking and I am leaning towards the b-quiet. Mainly because of price, 50 sq. ft. cost $130 where as 36 sq. ft. of Dynamat cost $250. And if I buy it on ebay I can get it even cheaper, around $100. I am just curious, for those of you that bought the b-quiet, which type did you get? I am looking at the bquiet ultimate. Another question what should the temperature rating be? For the bquiet ultimate the temp rating is 311 degrees.

I called the Soundowner, noise deadener used in yachts, and they are sending me some samples. They wouldn't quote me a price over the phone for some reason, but they are sending me a price sheet.

Thanks,
Brian

[ALANSD]

what about the neoprene sound deadener I saw on Ebay? Looked like a good product at a fair price. Supposedly used in Boeing aircraft.

[85/345]

Looked at the neoprene and was concerned about the ease of installing it. From what I read you have to use spray adhesive or something similar to install it. I have never really had any luck with the spray adhesives, could be I was just using the wrong kind. With the others they already have adhesive on them.

Was thinking and realized all I need on the floors is a pad that will help reduce the noise, I don't need any heat shield. The only thing I need a heat shield on is the doghouse cover. Am I right in thinking this way?

Brian

[IceKing02]

85/345,

I put in about two layers of the Ultimate (self-adherent) and then put down one layer of the V-comp. I used 3-M spray adhesive on the doors with excellent adhesion results at 24hours. I now drive around with more of a "bank-vault" feel and the stereo sounds "tighter" if that is the right way to say it.
There is no adhesive required for floors but is may help to keep it from bunching up under the floormats.

IceKing02

[Over59]

Ceramic spheres source. They have a range of products.

http://www.hytechsales.com/prod1000.html

[guy99]

That stuff sounds amazing, R-24 with 15 mil thickness! Maybe I should take off the inner skin and coat the inside of the outer skin? Seems like it would make it nice and cozy.

Kind of expensive, I guess.

[Over59]

I wouldn't get to excited about that R-24 number. Has to be "modified" test. Still I'll use it between the sheets in combination with the reflective foil with a foam cord.

[mcneon]

Originally Posted by 85/345

...I have never really had any luck with the spray adhesives, could be I was just using the wrong kind...

I've used 3M Super 77 spray adhesive in the past, but it's no good if you need resistance to high temperatures. It will soften and melt, leaving a gooey mess on everything it touches. This is especially true if you're gluing headliner material or convertible tops - ask me how I know!

The trick is to use a true contact cement, whether aerosol or liquid. J. C. Whitney offered a special spray adhesive for use with its soundproofing material, and it has proven very satisfactory. It stuck firmly and quickly to the underside of my doghouse and hasn't shown any signs of loosening over about 1-1/2 years.

Bob

[74Argosy24MH]

Originally Posted by 85/345

Was thinking and realized all I need on the floors is a pad that will help reduce the noise, I don't need any heat shield. The only thing I need a heat shield on is the doghouse cover. Am I right in thinking this way?

Brian

I would reconsider not thermally insulating the floor. The fan or airflow thru the radiator blows heat everywhere and you are sitting right over it.

John

[ALANSD]

I used some rubber underlayment left over from a flooring project to insulate around my dog house. Seems to make a nice difference in the sound level. I intend to double it and lay it under the front carpet. I also found a source for a stick on padding that could go up inside the firewall area...very reasonable. I bought a sample..it looks like it would do a great job. Check it out here---
http://www.sciplus.com/singleItem.cf...LogFrom=Search

[markdoane]

Originally Posted by ALANSD

what about the neoprene sound deadener I saw on Ebay? Looked like a good product at a fair price. Supposedly used in Boeing aircraft.

Uh-oh. I wouldn't try anything used by Boeing.

They need to re-insulate 1600 aircraft because of an insulation 'fire hazard'.