Fw: [pct-l] Tyvek bivi-sack

[goforth@cio.net (Joanne Lennox)]

----------
> From: Joanne Lennox <goforth@cio.net>
> To: Montedodge@aol.com
> Subject: Re: [pct-l] Tyvek bivi-sack
> Date: Thursday, October 17, 2002 2:48 PM
>
> there are at least two kinds of Tyvek: a strong omnidirectional fiber
kind
> and a more breathable and less waterproff kind that has a grid like
ripstop
> and more and larger pores between the directional fibers.  The latter
kind
> is the only stuff that I have seen at building sites for the last 5
> years.(and also at the builders Supply).  You need the omnidirectioal
> fibers stuff in my experience.
>
> I made water buckets(to haul water for horse friend and to soak up beet
> pulp feed) out of both types and found only the older omnidirection stuff
> held water for any length of time.
>
> I tried a lot of different things to mate the pieces or ends.  The thing
I
> found that worked the best was contact cement   Use at least a 2 inch
> overlap on the seams.  For a bivy sack this should be easy(if you can
find
> the right stuff) because you can just put the seam on the bottom.  Try to
> shape things by folding instead of cutting.  Also it is easy to make a
bivy
> two tight.  You need lots of space in the middle where you bring your
> kneees up and bend your body to turn.
>
> My Tyvek ground cloth has now been used on  three 5 month trips.  It will
> still hold water that is spilled on it and is looking very fuzzy.
>
> Joanne
>
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