Need Advice on Sound Proofing a Wall

I'm trying to sound proof a bedroom wall. Next to this wall are two heaters and two hot water heaters. Only 5/8 drywall separates the bedroom from the mechanicals. The wall is framed with 2x6 and I have access to the bays from behind. There is no insulation of any kind in the bays. I'm aware of using soundboard drywall, doubling up on the drywall, staggering the studs etc. But it is too late to rebuild the wall. I'm looking for sound batting that goes inside the bays. I don't need the pink insulation that is used for warmth. I need sound deadening material. Does anyone have ideas where I could buy this type of insulation?

 

I know it's for cars, but just a thought:

Dynamat Xtreme Mega Pak
Contents: (9) 24"x 48" (609mm x 1219mm) pieces of Dynamat Xtreme
Total Coverage: 72 ft² (6.68 m²)

$600.00

http://www.dynamat.com/store/store-car.asp
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http://www.owenscorning.com/quietzone/products/products.asp

You are still going to have trouble as with an existing wall the studs will carry sound through to the drywall. The wall really needed to be built differently with sound properties in mind.

 

We know sound travels through the studs, is there room on the other side by the equipment to put some foam board that you could float away from the studs with a thick bead of calk? Just a thought. I'd still pack the wall loosely for deadening.

 

Thanks. I don't how I missed this on the owens site.

Yes, this is what I am hoping to do.

 

A few suggestions:

Build another wall in front of this one?

+1 on the drywall, then sound board, then drywall, then sound board, then drywall and if you can use liquid nails instead of regular nails on the first layer of drywall.

The sound will still transmit through the floor, maybe the ceiling, and the pipes will also carry the sound, so try to isolate them as much as possible, isolate the equipment by placing them on top of sound deadening material.

Put two layers of soundboard on the side where the equipment is, one running one way, one running the other (so the seams don't line up).

 

It depends on the frequency of the noise that you want to stop. Mass stops low frequency noise, which is what I am thinking that you have here since the drywall would stop most high frequency noise.

You can get some leaded vinyl that has foam surfaces on it on line. It isn't cheap but it is made for exactly what you want to do here and if you put a layer of drywall on the inside of the inside of your wall and put this on the machinery side that would likely do the trick.

Remember that reverberation inside the equipment room also hurts you so making the other walls soft with sound absorbtion foam will help too.

Finally, you can also fill the area between the studs with something heavy and that would help too, think gravel or sand, messy but mass is mass.

 

Notice that they also list a sound-deadening caulk on that site. Never used it so no opinion of its' value.

 

the pro's use tectum panels. you may want to check them out.

www.tectum.com


good luck