soundproofing

[aztec]

hi, reading an article the other day about soundproofing. using a sandwich foam type panel. i'm using a similar material to insulate my new extension. what if any is the diference between the horendously expensive stuff, and the less costly stuff im using. and before anyone says it might catch fire... to be used in buildings it must be class 0, fire resisting... and naturally i tried to light it with my blow torch.. it didn't! i will almost certainly try it on my boat.

by the way its called kingspan and it is available in 6'X4@ sheets.

oh dear ive done it again.

interested in stuff that needs mendin'

http://homepage.ntlworld.com/s.amos/index.html

 

[ccscott49]

Probably no difference, apart from maybe waterproofing, but I doubt that, not only is it rip off Britain, (BY the latest survey) its rip off Britain+marine!

 

[bryantee]

How much and where from Please.
Have a good holiday weekend

 

[aztec]

bought from sydenhams buiders merchants but any merchants could order it, sold as celotex insulation/cavity sheets in 1200x450x17mm, also available in thicker sizes 1.38 each aluminium faced both sides. my bricklayer/builder has a degree in acoustic engineering (now he tells me!) and suggests that in the right area this stuff would work, just how well it does that comppared to the dear stuff remains to be seen.

nite nite.

interested in stuff that needs mendin'

http://homepage.ntlworld.com/s.amos/index.html

 

[Strathglass]

The foam type building insulation sheets are designed to have good themal properties but are not as good acoustically as the heavier marine type soundproofing.
I have used domestic building insulation sheets 1" thick to line the hull from the waterline to 12" up in the area of the forward bunks in a GRP hull to limit condensation.
It would have a slight effect but not much as a sound barrier.
It would have been nice to find another way to bypass Rip Off Marine Britain.
On that subject I now use Screwfix waterproof polyurethene adhesive for most of my glueing tasks on boats and find it very cost and time effective.
Iain

 

[Guest]

As I understand it there are two aspects to soundproofing, although I'm not sure I can remember the proper words. Firstly there is attenuation, meaning that you line the space where the noise is with something sift and undulating, i.e. something that will not bounce the sound waves off vigorously and keep them echoing around. I have seen egg boxes used for this purpose, and of course when you lay carpet in an empty room that stops the sounds echoing around.

Second principal is to stop what is left of the sound getting out of the compartment. This requires a dense layer with absolutely no gaps. A steel engine room is perfect. Even tiny gaps, if not properly baffled, will let out disproportionately large amounts of sound.

Marine sound insulation incorporates a soft (usually foam) attenuating layer, and a dense layer, nowadays usually plastic but twenty years ago it was lead. If your engine room is steel then the dense layer is unnecessary. If, as I saw the other week, you take your expensive foam faced insulation and clad it in perforated alloy sheet (to keep it clean, I was told), then you defeat the object entirely.

Incidentally I tried insulating as many of the surfaces of the engine room in my little GRP yacht with some good quality sound insulation that was lying about and I could not tell the difference, so I took it all off again!

You might be able to draw some clues from what has preceded.

 

[Frankklose]

just fitted out my boat a Jeanneau Rush 31 foot with the Halyard sound proofing material. used before some of the cheaper stuff ( pyramide ). I am now happy that I used the expensive material. It was a lot work to fit it and the result was very good. I made the engine room smaller and use an electric fan to get the air out.
It was worth it to use the expensive material.