I think what you are talking about is polyurethane foam,  not polyethylene
foam

Steven
82 Westy

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> From: Racer X <akimmons@PDQ.NET>
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: respect - Didn't your mama teach you any manners?
> Date: Tuesday, March 02, 1999 2:37 PM
>
> I insulated a van once in the past using these 1/2 sheets of foam covered
with
> foil.
> It's used as house insulation, comes in 4X8 sheets. Fairly cheap, easy to
cut
> and seemed to do a good job. Only drawback was the formaldihide smell
that
> stayed around for a couple of weeks...
> ---------------------
>