Sound deadener for genset compartment?

How much of the noise is transmitted via the air, and how much is vibration through the mount causing the rest of the RV to vibrate? If it's the latter, working out some better isolation mounts would probably be a whole lot more helpful. Increasing the mass of the RV bodywork in the area will help cut down on its vibrations; increasing its stiffness might also help some, as would layering materials of different acoustic impedance (i.e. squishy like foam and stiff like metal) as each change in impedance tends to prevent transmission.

Many foams do not hold up well to gasoline vapors or spray, and quite a few don't do well with heat. The stuff that's there already is possibly as much a heat shield material as it is there for acoustics.

I have the material like is linked to by Home Skillet but I see that many of the newer bus conversions are using this kind of material.
Sound barrier

maillemaker wrote:
I have seen "egg crate foam" like that before, in fact my RV came with it over the mattress (previous owner) as a mattress pad. But I would be leery of putting this in an area exposed to the elements and water spray like the genset compartment is. This is open-cell foam and will soak up and retain water easily.

Everybody and his uncle is producing so-called "acoustic foam" but if you're serious about doing this correctly keep in mind you only get what you pay for. ;) Surely you don't expect "egg crate foam" like that used as a mattress pad is going to have any meaningful impact at all when used as a noise barrier. :R

I have the material like is linked to by Home Skillet but I see that many of the newer bus conversions are using this kind of material.
Sound barrier

I have seen "egg crate foam" like that before, in fact my RV came with it over the mattress (previous owner) as a mattress pad. But I would be leery of putting this in an area exposed to the elements and water spray like the genset compartment is. This is open-cell foam and will soak up and retain water easily.

Steve

I have the material like is linked to by Home Skillet but I see that many of the newer bus conversions are using this kind of material.
Sound barrier

West Marine Noise Control Barrier ... purpose designed product that will actually work. ;)

DynaMat ?

i think is the one most often recommended, it costs more than other brands
but will do what you want?

often used under the hood trucks or 'dog house' in RV's to reduce engine noise

Weight (mass) is the only thing that actually reduces sound transport through a wall.

It's not a great thing to add to an rv, unfortunately.

That stuff won't work very well. It dampens harmonic vibrations, like a body panel in a car.

You would need this here.

LINK