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Tyvek - for just another thin layer over sleeping bag.

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Offline dprather

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Tyvek - for just another thin layer over sleeping bag.
« on: April 18, 2014, 07:41:57 PM »
Owning two quality backpacking sleeping bags (wife - "Do you HAVE to have two?), they are at opposite ends of the temp spectrum - 15-degrees and 45-degrees.

I'd like to add a light weight single additional layer over the top to make both a bit more more comfortable when temps fall below their range (I like to sleep warm).

I've wondered about Tyvek (tried a space blanket and came out too well done).

I'd take an 8' x 3' tapering to 4" sheet, fold 1.5' of the narrow end under at the bottom to make footbox.  The most patient woman in the world says she can sew the side seems of the footbox.

Tyvek is crinkly and LOUD!

Does anybody know a better material for this project than Tyvek?

Does anyone know how to quiet Tyvek down?

TIA amigos!

!!Livin' for November (or October if the temps get right)!!
« Last Edit: April 18, 2014, 07:47:17 PM by dprather »
Leave "quit" at the car.  Embrace the trail as your friend.  Expect to enjoy yourself, and to be amazed.

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #1 on: April 18, 2014, 08:48:40 PM »
Tyvek is meant to be a moisture barrier, so it is better beneath you, but not so much on top. I am thinking you need something that will breath above you.  :eusa_eh:

You could try a silk sleeping bag liner, something like this:
http://www.amazon.com/Cocoon-COCO-017-Silk-MummyLiner/dp/B001DX9Z7W/ref=pd_sim_sbs_sg_1?ie=UTF8&refRID=0R0SFNP6VJ8K99AN73H1
that will make your 45 degree bag about 5 to 10 degrees warmer.  :eusa_think:

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Offline dprather

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #2 on: April 18, 2014, 11:19:49 PM »
You are right!  Tyvek is a vapor barrier!  Tyvek is a no go.
Leave "quit" at the car.  Embrace the trail as your friend.  Expect to enjoy yourself, and to be amazed.

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Offline dprather

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #3 on: April 19, 2014, 09:25:59 PM »
Take a look here.

http://sectionhiker.com/tyvek-sleeping-bagquilt-cover-from-terra-rosa-gear/

A special kind of Tyvek that breathes!
Leave "quit" at the car.  Embrace the trail as your friend.  Expect to enjoy yourself, and to be amazed.

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Offline Homer Wilson

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #4 on: April 20, 2014, 12:04:44 AM »
My silk liner definitely adds a few degrees of warmth to my bag.  I've heard stories about people putting trash bags around their sleeping bags,  but I have no personal experience there.

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Offline Geezer

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #5 on: April 20, 2014, 12:41:50 AM »
Even breathable Tyvek might cause a condensation problem. Mule Ears has a great post on this issue on his site: http://40yearsofwalking.wordpress.com

It's under "Equipment" and is titled "The Bivy Condensation Conundrum."

Geezer

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Online mule ears

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #6 on: April 20, 2014, 06:32:05 AM »
Take a look here.

http://sectionhiker.com/tyvek-sleeping-bagquilt-cover-from-terra-rosa-gear/

A special kind of Tyvek that breathes!

I wonder if you can even get that cover here in the US?  The Tyvek in that cover is what kite makers use and you can usually find it at hobby shops. 
temperatures exceed 100 degrees F
minimum 1 gallon water per person/day
no shade, no water
http://40yearsofwalking.wordpress.com/

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Offline RichardM

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #7 on: April 20, 2014, 06:59:17 AM »
Take a look here.

http://sectionhiker.com/tyvek-sleeping-bagquilt-cover-from-terra-rosa-gear/

A special kind of Tyvek that breathes!

I wonder if you can even get that cover here in the US?  The Tyvek in that cover is what kite makers use and you can usually find it at hobby shops.
Or Amazon:
http://www.amazon.com/Tyvek-1443R-Kitemaking-Material/dp/B001TO4QVA

Or how about some pants?

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Offline Robert

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #8 on: April 20, 2014, 08:36:12 AM »
A couple of years ago I bought some of the 1443R tyvek from Amazon (probably the same link that Richard mentioned) and use it for a ground tarp. It does soften over time and works well. It does tend to pick up dirt a little more than plastic does. I've never had it out in much rain so can't speak to its water resistance capability.

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Offline dprather

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #9 on: April 20, 2014, 02:31:38 PM »
The model I'll follow is based on Therm-a-rest's (and other's) quilt/blanket designs.  This has a short footbox that will anchor the Light Weight Backpacking Throw (LWBT) on top of my pad/airmattress.

The most patient woman in the world has suggested  70 denier poly/cotton ripstop.  Hearing me prattle on about kinds of Tyvek, means of attaching Tyvek to itself, ordering Tyvek online, and etc., she suggested a fabric that she could easily sew (rather than watching me painfully struggle). 

These kinds of projects my be my warm-months backpacking substitute activity.
Leave "quit" at the car.  Embrace the trail as your friend.  Expect to enjoy yourself, and to be amazed.

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Offline dprather

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #10 on: April 20, 2014, 03:19:09 PM »
oops - 6 oz poly/cotton ripstop
Leave "quit" at the car.  Embrace the trail as your friend.  Expect to enjoy yourself, and to be amazed.

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Offline brave6

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #11 on: April 21, 2014, 07:26:23 AM »
A liner was mentioned upthreadů combined with wool socks, long johns, and a long sleeve top it adds quite a bit of warmth.

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Offline dprather

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #12 on: April 21, 2014, 09:53:23 AM »
Yes - it might be much more simple to go the long johns route.
Leave "quit" at the car.  Embrace the trail as your friend.  Expect to enjoy yourself, and to be amazed.

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Offline Homer67

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #13 on: April 22, 2014, 01:02:32 PM »
I used a 7X3 strip of tyvek under my z-lite on my last trip.  I have a 40 deg bag, and it got down into the low 30's on two nights.  Silk longjohns, a polar cap and two pair of socks worked well with my clothes.
Ah Big Bend, we will soon return to reacquaint ourselves in our ritual of blood, exhaustion and dehydration. How can we resist the temptation to strip ourselves of the maladies of civilization?

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Offline RichardM

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Re: Tyvek - for just another thin layer over sleeping bag.
« Reply #14 on: April 22, 2014, 01:16:53 PM »
A simple lightweight fleece blanket might also do the trick. Even a spare sheet (flannel or otherwise) is easy enough to toss in the backpack. Sometimes long johns tend to bind during the night (or maybe that's just me). It probably doesn't help that I'm usually in a bag that is flannel-lined, so the long johns tend to "grabbed" by the bag as I move around. I used to have a pair of Lycra tights that worked fairly well for cold-weather sleeping, as they were slippery enough to allow movement.

 


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