It should be at your builder's supply.
Google popped up a bunch of sources and these guys have a good price and 4'
wide rolls, too!

http://www.farmtek.com/farm/supplies/prod1;ft1_tekfoil_reflective_foil_insulation;956af1a4.html

Jake

On 2/28/07, Jason Willenbrock <pooncerelli@hotmail.com> wrote:
>
> Hey all,
> thanks to everyone who replied about the insulations.  seems the silver
> bubble wrap is very popular.  I checked both home depot and lowes, niether
> stock it.  where can I find this stuff.  Also,
> what if I used regular bubble wrap and used foil emergency camping blanket
> as my vapor barrier.  Would this carry any advantage???
> thanks
> jason
> 87 syncro westy
> so many roads to ease my soul...
>
>
> >From: Tom Buese <tombuese@COMCAST.NET>
> >Reply-To: Tom Buese <tombuese@COMCAST.NET>
> >To: vanagon@GERRY.VANAGON.COM
> >Subject: Re: alternatives to fiberglass insulation
> >Date: Mon, 26 Feb 2007 14:05:15 -0700
> >
> >On Feb 26, 2007, at 12:52 PM, Giasson, Pascal (DNR/MRN) wrote:
> >
> >>Just a few other points to consider also.  The silver bubble wrap
> >>reflect radiant heat to the inside and outside which increases it's
> >>effectiveness at keeping the heat in or out.  I doubt that with all
> >>the
> >>other sources of heat entrance or escapes that it will make much
> >>difference what is used, but the foam material is definitely cheaper
> >>that the bubble wrap.  Whatever you use do not use anything that can
> >>hold moisture like the OE fibreglass stuff.  I did not glue my
> >>insulation in place as I wanted to be able to easily remove to
> >>re-rustproof.  Also, I did not bother with vapour barrier, way too
> >>hard
> >>to do a good job in the westy...too many factory holes
> >>everywhere...and
> >>I like the holes and gaps to allow any moisture that does
> >>inevitably get
> >>in to get out fast in.
> >
> >The vapor barrier is a critical element.  Vapor migrates from warm to
> >cold, so if you stop it from traveling to where the dew point is,
> >somewhere in your insulation, w/ the vapor barrier, it does not form
> >at all in your insulation.  Now if it is warmer on the outside than
> >the inside, then the flow reverses direction & you trap it in the
> >insulation.  But generally, vapor barriers are always put on the warm
> >or inside of the insulation. The best way to do this is like the
> >current auto mfrs' do, glue a continuous vapor barrier over the
> >entire wall/ceiling/floor w/ as few holes as possible, & then place
> >your finish panels over it. A reflective foil works even better than
> >plastic sheathing, as it reflects radiant heat like mentioned above.
> >
> >>
> >>BTW, nothing beats a good sleeping bag and another warm body to keep
> >>warm while camping ;o)
> >
> >I use a 0-20 degree F bag all year, just opened or spread out
> >differently depending on air temp, SO next to moi or not.
> >
> >
> >
> >Tom B.-can you say low emissivity (low E) barrier?
>
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--
Jake
1984 Vanagon GL
1986 Westy Weekender "Dixie"
www.crescentbeachguitar.com