BoatBanter.com - View Single Post - Need help with noise insulation in aluminum hull

wrote:

Guys,

I ahve a 19 ft aluminum boat. It has an inboard jet with a Merc 200 HPO
powerhead. The motor is under a doghouse .. 1/8 aluminum with bubble
wrap insulation.

The motor is very loud. Some noise comes from, the entiure hull
vibrating but most comes from the doghouse which also isnt airtight...

I am planing to line it with soundown dampener and put decoupler foam
over it. ...

Unfortunately I cant get ahold of them by phone or email..

Can anybody please help?

I am wondering how heavy the dampener layer has to be for the 2 stroke
nopise? weight is an issue so I am hopeing .5 - 1 lb/ft2 will do ...

How heavy and think of a foam/decoupler layer will i need? will 0.5
lb/ft2 with 2-3" foam do?

Any advice appreciated
Matt

on an aluminum hull, you can get great dampening for conducted noise
with the cheap bedliner stuff you can get at Menards. You have to use a
self etching primer to get it to stick, but it will dampen a LOT of
vibration conducted through the thin hull.

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