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Old 09-05-2010, 06:51   #1
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Sound Insulation

Genset sits below the galley sink. Boat had some sort of insulation adhered to the underside of the SS galley sink. But the heat of the genset caused the insulation to peel off. So I need some new insulation. The main criteria needs to be the ability of the insulation to stay stuck to the sink. Great insulation doesn't do any good if it peels off.

Anyone with good results in similar situations? Have you mounted insulation above a genset or engine and had it stay in place? I really can't screw into the sink! The space is VERY tight so building a box isn't possible. Seems adhesive is the only solution.

There are many choices in adhesive backed insulation panels, just need to get one that will stay stuck to SS in high temp conditions.

Thanks
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Old 09-05-2010, 07:47   #2
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3M super weather trim adhesive doesn't soften from heat as readily as regular contact cement. Or you could build a full top (bottom ?) of plywood right under the bowl. That would also help seal the noise.

While you might not be able to build a separate box to fit under there, from what i understand about noise suppression, to be effective you will need to make a total enclosure of whatever cabinetry you have there, and line all of it with the foam (Sound Down comes to mind). duct in air indirectly, I think.
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Old 09-05-2010, 07:49   #3
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Soundown has adhesive compatible with their products as well as mounting instructions. Maybe you can epoxy a few mechanical fasteners to the bottom of the sink to help support the barrier material.

Soundown (Sound Down, sound down, sounddown) - The Woldwide Leader in Noise Control Engineering
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Old 09-05-2010, 08:15   #4
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Talking

I'm not an expert so I may have some of these terms wrong. But as I understand it - there are three parts to sound insulation:

Barrier (stop sound waves) - anything dense and heavy
Transmission (vibration) - flexible
Absorption (soaking up the sound) - usually foam

I've found on boats that barrier is the most important. Keep the sound at the genset! It turns out that very small openings pass almost as much sound as if there was no insulation at all. You can see this with any door. A door that's open a crack is a lot noisier than one that's shut all the way.

So I'd first see if you could build a tight plywood cover at the sink cabinet bottom that leaves no openings. Caulk the cracks. There's also an amazing relatively new product used in construction called Green Glue. This is an elastic goop (green no less ) that you can put between two sheets of plywood. It does an amazing job and is cheap.

Green Glue is your soundproofing and noise reduction material

Carl
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Old 09-05-2010, 11:28   #5
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Silent Running - high performance sound and vibration dampening coating for marine vessels

A sound dampening paint. Sounds too good to be true. Any experience with this?
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Old 10-05-2010, 12:55   #6
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Here's a post from my engine cover sound proofing project.

S/V Deep Playa - Pearson 424 : We're looking for the trash fence

We're very happy with the results.
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Old 10-05-2010, 14:40   #7
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Patrick, I see nothing!
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Old 10-05-2010, 14:46   #8
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I think something is up with my ISP. This is a good link though.

http://www.deepplaya.com/post/Engine...-proofing.aspx

I hate that CF replaces the text with the title of the web page though
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