Lead sheets

[tekebird]

lots and lots of alternatives.....most from the marine or Aerospace industry

where light Weight is a key factor

[steamguy56]

someone I met at bussing 08, advised the bubble wrap foil rolls under ply sub flooring works well?

[edroelle]

I would be surprised if bubble wrap would do much.

For those designing their generator compartment -

To reduce sound, the theory is to reduce the low frequencies with mass (lead or other) and the high frequencies with a soft material.  The auto industry uses a hard dense rubber material and a felt material on the front of dash and some floor pans.

When I constructed my generator box in my MCI 8, I used the following materials from outside to inside - particle board (next time I would use wolmanized plywood for better moisture acceptance), 1/8" heavy black rubber product (like horse stall material), fiberglass ceiling sheets (or waffle rubber).  The other design element to incorporate is to duct the air so the sound waves are absorbed instead of going straight out or bounce on hard surfaces.

BTW, this installation in the MCI 8 was much quieter than my current coach with a professional installation.

Ed Roelle
Flint, MI

[TrevorH]

I have had very good results with a sound deadening product call DynaMat.  I always used it with subs for large stereo systems but it deadens noise and vibrations amazingly well.  They have multiple types ie with foil, thicknesses, etc.  Its pretty pricy but for a generator area or over and engine compartment I think it would work very well.

[JohnEd]

So,

If I have 1/8 th inch thick lead,  Polyisoc. foam insulation,  Plywood sheeting, 1/4 inch rubber mat from tires.   What would be the order of installation?  How thick for each/the plywood sheet?  How thick for the/each poly sheet.  Adhesives?  Fastening?  Rubber too much?


This would be the ultimate, right?

Thanks for taking the time,

John

[tekebird]

Trevor, although Dynamat is an OK product it pails in comparison to the marine stuff used for Generator and Engine room Apllications.

Can't think of the product name right now....if you do a search It will come up in the archives.

I have seen real life comparisons of this stuff......the online digital sound comparison is very representative of real life.

[tekebird]

http://www.glacierbay.com/insulation_ultradb.asp

[JackConrad]

Google 'Soundown"  They manufacture a veriety of sound reduction materials.  Jack