soundproofing

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ginty

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soundproofing

Does anyone know the best way to go about soundproofing my boat ? She is a 22ft Swin Ranger fisherman with a 16 horse Yanmar diesel fitted under a self draining deck with access through the cabin. At present there is no soundproofing at all and I think the most effective way would be to build a ply box lined with acoustic panels, would this restrict ventilation and overheat the engine? Also would the noise travel through the bilge and defeat the whole purpose? /forums/images/graemlins/confused.gif
 
Re: soundproofing

Advances in sound proofing have gone well in the last few years, look for system that is both soundproofing and a board in one, can be cut and a simple box made up in no time.

The old ply box lined with a good quality soundproofing material still works, if this is your preferred method of construction, problem is the ply tends to act like a drum skin with any sound that manages to penetrate the proofing material, the new board absorbs this noise.

Ventilation can be supplied via flexible ducting, also suitably sound proofed, of though a ducted box with sound baffles installed; this type cab be fixed to the hull with a vent on deck or internally. These systems will provide enough air to keep the box cool enough because a high volume of air is sucked in by the engine when running.

Closing off the bilge can be achieved by building a retaining bed for the cover that fits neatly to the hull, limber holes may be required and should have a sleeve to ensure no water gets into any timbers or beams of other martial, you may like to fit a small baffle at the outlet end.

I assume your engine is diesel, if petrol you will need a bilge blower.

I hope this helps.

Avagoodweekend......
 
Re: soundproofing

Can't disagree with oldsaltoz, as usual. My soundproofing is by Halyard. I believe they make several grades. The best ones used to have a layer of lead but I see that that has been superseded by something denser (Depleted uranium? /forums/images/graemlins/wink.gif )
 
Re: soundproofing

I believe that most of the polyurethane foam sound prrofing material is liable to offgas with cyanide when it is heated near ignition point.

The sound attenuation provided by the foam is little better than thick denswe plywood or dense wood.

If a box can be made that can be sealed then in the event of fire CO2 can be relased into the box through a small resealable port or capped pipe.

I've seen polyuurethane foam buring in boats at sea, not pretty.
 
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