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Date:         Sun, 31 Dec 2006 16:26:48 -0800
Reply-To:     Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Subject:      Re: Acoustic properties of common materials
Comments: To: Sudhir Desai <sudhir.desai@gmail.com>
In-Reply-To:  <5c80974c0612311538v721b850ag60d3f35179283991@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I smooshed roofing compound on the underside of all that single-thickness metal in the fenderwell/step area and it has made a HUGE difference in the noise level when driving in the rain.

I haven't tried touching it but I bet the quarter-inch layer of tar has added to the separation between interior and exterior temperatures.

On 12/31/06, Sudhir Desai <sudhir.desai@gmail.com> wrote: > > don't forget to think about condensation; another problem causer. ~ > sudhir > > On 12/31/06, Nathaniel Poole <npoole@telus.net> wrote: > > I thought about it, but what Iım going to do is make sure everything is > > sealed. Make sure there arenıt any sources of water ingress from the > > outside, get handy with a caulking gun. Finish up with sheet poly before > the > > finish panel. Course I wonıt be able to do the front doors. But the > other > > night while on the highway I noticed that the wheel hump beside the seat > was > > absolutely freezing. Iım sure if I spat on it it would have frozen. You > can > > have all the heat you want blowing but when that kind of cold metal > lines > > the van ­wow. Iıll have to think what I should put down around there. > Maybe > > carpet underlay or something, underneath the rubber mat. On top of the > > paint/cellulose. There is also a huge amount of noise coming from the > nose > > and and floor area. > > > > > > On 12/31/06 2:08 PM, "Jake de Villiers" <crescentbeachguitar@gmail.com> > > wrote: > > > > > You might want to reconsider Nathaniel. The fibreglass will retain > moisture in > > > there. > > > That's where the foil/bubble/bubble/foil material is best. More R > value and > > > no water retention! :) > > > > > > On 12/31/06, Nathaniel Poole <npoole@telus.net> wrote: > > >> See http://www.nrcratings.com/nrc.html. > > >> > > >> Aside from the acrylic/cellulose slop I'm putting on as a first > layer, I'm > > >> going to try to stuff the interior panels with fibreglas acoustic > ceiling > > >> tile. These aren't quite as good as what is listed above, but they > also > > >> provide thermal insulation. These have an NRC of 55% and Transmission > > >> coefficience of 35%. That will make a big difference. And that's > before I > > >> install the cloth-covered interior surface panels. If there's still > space in > > >> the "walls" I'll stuff it with more fibreglas. > > >> > > >> Nathaniel > > > > > > > > >

-- Jake 1984 Vanagon GL 1986 Westy Weekender "Dixie" www.crescentbeachguitar.com


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