[Archived]

Looks great Joe, congrats.

[Billy]

Did it have any impact on noise levels? It certainly looks like a much better long term option.

[DON]

Nice job Joe..

[Joe]

Thanks George, I didn’t know I had that much flexibility left. I did not pull the genny. I crawled behind it way too many times. I’m not known for my abs!

Jon,

I have not run it yet since I finished. I used the 1″ soundown replacing the 2″ egg crate foam. The foam was very heavy almost oily after 27 years of service. So I suspect the new should work better.

Interesting the roof had about 3/4 inch of dense foam covered with what looks like a sheet of lead then the 2 inches of foam. I left the dense foam and and the sheet metal in place. My guess is that contributes significantly to noise reduction inside the coach. The left side wall also had metal installed. I took the foam off the inside of the bay door several years ago because of the crumbling.

I may notice if it does not work as well but better performance may be hard to know. I’ll try to run it tomorrow.

[Dick]

Thanks Tom, its nice as long as it lasts a long time.

[Archived]

OMG how’s that flexibility tonight ?

[Joe]

I think this is accurate. I believe all my Liberty hush boxes had similar foam and I believe all had a layer of lead. The density of lead is very good for dealing with sound.

[John]

George, lets just say I’m glad I spread it out over two weekends. One to remove the old and prep the bay, and the second to install new. Since I went with a different thickness the old pieces were not good for patterns. Had to measure each one = more trips.

[Archived]

Jon, I ran it today and I would say the noise is about the same. So trading 2 inches of old for 1 inch of marine grade material must be about equal.

Inside the coach I attribute most of the sound to the squirrel cage fan and motor not the yanmar diesel. In my setup the radiator is mounted horizontally to the floor of the second bay, just ahead of the Aux fuel tank. The direct drive fan is mounted on a plywood box mating with the radiator. All of which is directly below the aisle in the living area.

I did pull the access panel to the fan and interesting there is not any insulation on the top of the bay, only the back side and the left side wall (the right side wall is the back of the generator box).

I have some material left and will add a layer to the roof one day. My primary objective was to get the old crumbling material away from the generator head. Two many stories of expensive repairs due to grit and dust in the head.