[at-l] bivy construction question

[sloetoe at yahoo.com (Sloetoe)]

Date: Sun, 27 Jul 2003 12:37:26 -0400
From: "Jim Bullard" <jbullar1@twcny.rr.com>
Anyway, it would seem to me that if I made a waterproof bivy
sack such as you propose my feet would end up wet by morning
because the condensation would be inside the bivy sack.
### *SOAKED*. Yucky. But...

> As an experiment you might want to try pulling a large plastic
bag over your sleeping bag to the height you propose making the
bivy sack waterproof and see what happens. If it turns out to be
a bad idea at least you won't have much invested in it.
### But the experimentation is dang cheap. Revealing, too, in
terms of just how breathable (or impermiable) various materials
are. Gives you some respect for properly used (ahem) GoreTex.


----- Original Message ----- 
From: "Jean-Paul Miller" <jeanpaul@comcast.net>


> I am looking at making a bivy sack. 
> is there some reason for using breathable material on bivy
sacks.  
> should I make the top section out of something breathable?
> what is the consensus? my thinking was it does not matter. 
> your breath is were most of this moisture comes from anyway..
### It will shock and amaze you at how little impermiable
barriers need lay over you, in order to produce a
condensation/sweat pool underneath.

> any one have any experience with this stuff?
Between Tyvec and the Campmor "Emergency Bivy" and of course
silnylon, modern science offers us a good ol' time...

Have fun!
'Toe

=====
Spatior! Nitor! Nitor! Tempero!
   Pro Pondera Et Meliora.

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