soundproofing

[heinz wittenbecher]

> Heinz said...
> >I had some heavy foam/foil on one side left. It's about 1/2 to 3/4 inch
> >think. I'm putting it on top of the box inside.
>
> I'm gathering from what you said that you would prefer it under the top
> of the box, but there is no room or the heat is too great or something
> (please confirm).

I already have soundproofing inside the generator compartment.
This is just 'extra'. Just trying for the utmost quiet. It's already quieter
than my Onan was but I have to keep fiddling until it's the best I can get
to... or it breaks, which means it wasn't good in the first place

>
> I'm guessing that you may cover the foil/foam with some rigid material
> forming a foam sandwich. If you could break the continuity of the old
> top of the box with the rest of the box and eliminate the
> soundboarding... (don't have it all worked out, but just trying to
> help...)

Any and all suggestions always appreciated. Sometimes they get used and
sometimes they are the trigger for a great idea

Heinz

>
> --
> "I do whatever my Rice Krispies tell me to..." John said, from inside a
> 1974 Glacier.
>
>

 

[john dolan]

Heinz said...
>I had some heavy foam/foil on one side left. It's about 1/2 to 3/4 inch
>think. I'm putting it on top of the box inside.

I'm gathering from what you said that you would prefer it under the top
of the box, but there is no room or the heat is too great or something
(please confirm).

I'm guessing that you may cover the foil/foam with some rigid material
forming a foam sandwich. If you could break the continuity of the old
top of the box with the rest of the box and eliminate the
soundboarding... (don't have it all worked out, but just trying to
help...)

- --
"I do whatever my Rice Krispies tell me to..." John said, from inside a
1974 Glacier.

 

[hdavis]

>Heinz
>
>Check this out.
>
>http://www.rvamerica.com/rvnews/feb1997/new_product.htm
>
>Then if you want to get carried away 3M makes a product that
>comes in about 10 inch squares that dampens sound. The auto
>stereo boys put them on door panels ect to dampen vibration
>noises caused by big stereo systems. Sorry dont have a link
>for that. I did see them at my local NAPA dealer. Seems to
>be rubber and lead material.

Here's what I know about this type of material so far:

1. don't get it hot. The open cell foam will deteriorate in high temps.
There are batts available that will survive out engine compartments.
2. the lead is bonded to open cell foam which in turn is adhered to the
wall. So you have lead on the outside, foam in the middle and then your
structure.
3. wet environments require closed cel foam, which is much less effective
at damping sound than the open variety
4. it's pricey - about $15/ sq ft
5. it weighs about 1 lb/sq ft
6. the suspended lead is what dampens the noise. The foam is just a
convenient way of attaching the whole mess.
7. the engineering literature calls this a "suspended mass" acoustic dampener

See www.soundown.com for another vendor's information.

You can also reduce noise by using vinyl mats under your carpeting and
another plastic material under any wood floors that you might add.

FWIW, the insulation on the skins of our coaches also acts as a noise
dampener - the modern lightweight "bubble" insulation is nice, but don't
remove the old insulation if you ant to keep things quiet.

Henry

Henry Davis Consulting, Inc / new product consulting
PO Box 1270 / product readiness reviews
Soquel, Ca 95073 / IP reviews
ph: (831) 462-5199 / full service marketing
fax: (831) 462-5198
http://www.henry-davis.com/ http://www.henry-davis.com