Date: Mon, 19 Feb 2001 10:18:15 -0500
Reply-To: Access Systems <accessys@SMART.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Access Systems <accessys@SMART.NET>
Subject: Re: [T2] Sound proofing - my version
In-Reply-To: <5.0.0.25.2.20010218223845.017094e0@gemini.tntech.edu>
Content-Type: TEXT/PLAIN; charset=US-ASCII
On Sun, 18 Feb 2001, Holly and Chris Mills wrote:
just had this stuff put on the roof of my house and had thought about
using some for my van, but it is referred to on my roof invoice as
"Modified Ruberoid"
let my know how it works,
Bob
> Date: Sun, 18 Feb 2001 23:24:45 -0800
> From: Holly and Chris Mills <scmills@tntech.edu>
> To: type2@type2.com
> Cc: vanagon@GERRY.VANAGON.COM, vintagvw@sjsuvm1.sjsu.edu,
> Virtualvairs@skiblack.com, old-chevy-truck@egroups.com,
> oletrucks@autox.team.net, 914@rennlist.org, hooligan_racing@topica.com
> Subject: [T2] Sound proofing - my version
>
> I hope this bit of info helps some of you and it applies to anything old
> and noisy.
>
> This vehicle in question is a '78 VW Westfalia camper. I'm finishing a
> general freshening up - that has taken 2 years this Easter - which includes
> trying to update a few things - the upholstery, interior lighting, noise
> level at 60 mph, and handling (with sway bars).
>
> I started a hunt for a way to quieten it down. VW's are pretty noisy
> sometimes of course.
>
> The search naturally led to Dynamat but the cost was way to high for my
> budget to support enough material to do this bus which has lots of floor.
>
> JC Whitney had their version of Dynamat as a reduced cost but still high.
>
> My objectives were to lower the noise inside the van:
> 1) cheaply
> 2) effectively
> 3) not create a rust problem (the VW can do that on it's own)
> 4) I wanted something that I could get locally (in our small town)
>
> Dynamat fails #1, the silvered faced sheets of jute that Lowe's sells
> locally fail #2 as their isn't enough material (thickness) there.
>
> Carpet underlayment fails #3 I guess and so may industrial neoprene (also a
> reasonable cost).
>
> The various OEM guys use a thick tar paper material much like Dynamat on
> the fire walls and some parts of the floors. All that LOWE's has to offer
> was thin tar paper - which would require may layers of glue and paper to
> build enough mass to be effective.
>
> A fellow once posted to one of the VW lists that there are two basic ways
> to dampen the noise a car makes - absorb it (upholstery, carpet, etc) so
> there isn't much to reflect, or dampen the vibration of the metal panels of
> the bodywork. The OEM guys use a combination of both obviously using the
> tar paper panels and jute. I'll do the same with my asphalt material on the
> floors and foam on the vertical surfaces all - and I mean all of the other
> surfaces upholstered - roof too (all except the cabinets).
>
> Finally I started talking to local roofers - specifically ones that worked
> on commercial flat roofs. One very helpful fellow here in middle TN took
> the time to show me the materials he uses which were mostly as you can
> imagine, the standard thin tar papers.
>
> However he showed me a roll of modified polymer+bitchum - that is 180 mls
> (maybe a lower number slightly) versus the thin regular tar paper stuff.
> Imagine comparing sliced American cheese to newspaper.
>
> He showed me how it had a face which when heated with a Propane torch would
> get sticky and could be layered to any thickness. It looks like three
> layers would gain you 1/2" or so. The heat required seems to far exceed the
> temps of a hot car in the summer.
>
> It will also require a torch to really get this stuff contoured to any
> curves your floor might have. I left the roll of material in the back of my
> CR-V for two days (other things to do) and noticed no smell despite the
> fact the car got 70 degrees one day (inside) and feel confident that any
> very hot days my bus might see would only create a small stink inside that
> would fade with time.
>
> My plan is to lay this material directly on the floor with glue and heat
> and then top it with any layers I might need and then top it (and glued)
> with the silvered jute material from LOWE'S to keep the black
> bitchum/polymer junk where it belongs. This will be topped with carpet and
> etc.
>
> A roll 3 feet by 45 feet cost me $42. The opposite side of the material is
> similar to regular tar paper but not prone to tearing - in fact you
> couldn't if you tried.
>
> It weighs about 50 lbs for the whole roll.
>
> He questioned me to the exact trade name of the stuff in the magazines
> (Dynamat) and told me he was sure that Dynamat was a 'John Mansfield Co'
> trademark and was generally used (as I understood it - our conversation was
> held during a hard rain under a tin roofed pavilion) for walk mats in
> roofing - sections of flat tar roofing with a thicker membrane suitable for
> foot traffic (maintenance people). It was also cheap and very similar to
> what I purchased - naturally he had my stuff in stock and didn't have the
> raw Dynamat though he said he could get it if I wanted to wait a few days.
>
> So looks like the magazine guys are making a fortune off of folks willing
> to pay retail price for Dynamat. My version won't have peel and stick glue,
> so I'll have to use spray can glue I think, but I am very excited about a
> successful hunt!
>
> Hope this helps some of you out there.
>
> Two successes this week - another fellow on the Type 2 (VW) list sent me
> the recipe for Waxoyl (another item sold in small quanities through the
> catalogs) - anyone know where I can buy candle wax or bee's wax in bulk?
>
>
>
> I'm getting a good education from you GOOD folks!
>
>
>
> CHRIS in Tennessee
> scmills@tntech.edu
> ICQ: 5944649
>
> '78 VW Westfalia (maybe some CIS injection,Corvair, turbos --- maybe I'm
> just dreaming.....)
> '65 Beetle (Type IV powered)
> '99 CR-V 5 speed
> '49 Chevy 3100 Pickup
> '81 Honda CB900C
>
>
>
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