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thoms tyvek GCB (ground cover bivy)
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Thom Darrah
(thomdarrah) - MLife

Locale: Southern Oregon
thoms tyvek GCB (ground cover bivy) on 03/17/2008 11:44:55 MDT Print View

Attached are a few pictures of the latest prototype of my tyvek GCB project.

view from hood

view of GCB with bag inside

sleeping bag on top of GCB

Edited by thomdarrah on 03/20/2010 07:31:27 MDT.

Nicholas Seeley
(seel1214) - F
Thoms tyvek GCB ( ground cover bivy) on 06/08/2009 09:30:09 MDT Print View

Hi, I was wondering if you could post some directions on how you made this. I am new to this so I apologize in advance if there are already directions up that I can not find. Thanks

Eric Beaudry
(EricBeaudry) - F
GCB on 06/09/2009 06:24:45 MDT Print View


Nice stuff. Curious if this is made with your bonded seams?

Also, any idea what the weight ended up being? Looking to build a bivy here soon. This tyvek version looks promissing.


Edited by EricBeaudry on 06/09/2009 06:25:25 MDT.

Thom Darrah
(thomdarrah) - MLife

Locale: Southern Oregon
GCB on 06/09/2009 06:44:54 MDT Print View

All GCB's have been made using bonded seams. Early versions were made using a 2" overlap seam but on more recent models I've switched to a 1" bonded seam. Strength and durability have not been effected by this change. The weight has been noted in prior postings but that was before the seam change. I will weigh and post pictures of a newer version soon.

If interested please PM with email information.

Edited by thomdarrah on 06/09/2009 06:46:25 MDT.

Guy Bouchard
(gbouchar) - M
Any news? on 03/15/2010 19:50:05 MDT Print View

Any news on this project? I am thinking about making a bivy either sewing silnylon or bonding Tyvek. Any pattern online?

Tom Holbrook
(Zandar) - MLife

Locale: Central Coast of California
Status of your drawings? on 03/19/2010 11:49:54 MDT Print View


Did you get your computer issues ironed out? Would love to see your plans/drawings.


Thomas Trebisky

Locale: Southern Arizona
Isn't Tyvek noisy as heck? on 03/19/2010 23:24:26 MDT Print View

I have carried Tyvek that looks like this for a groundsheet and found it almost drove me nuts when a wind came up. I have since switched to 4 mil polyethylene, which is really cheap, available, and not nearly so noisy. I read somewhere that you can launder Tyvek and "soften" it so it is more civilized, but with some loss of protective properties.

Not that I am trying to be a wet blanket, your work looks really great, but I got ugly flashbacks looking at that Tyvek logo.

Edited by trebisky on 03/19/2010 23:25:36 MDT.

Doug I.
(idester) - MLife

Locale: MidAtlantic
Re: Isn't Tyvek noisy as heck? on 03/19/2010 23:31:57 MDT Print View

When I buy Tyvek, first thing I do is throw it in my top loading washer. I let it run through a complete wash/rinse/spin cycle. Nice and quiet after that. Soft, too.

Franco Darioli
(Franco) - M

Locale: Melbourne
thoms tyvek GCB (ground cover bivy) on 03/20/2010 01:37:54 MDT Print View

For this kind of application I would think that soft/clothing Tyvek would work much better than Housewrap.

Mark McLauchlin
(markmclauchlin) - MLife

Locale: Western Australia
Re: thoms tyvek GCB (ground cover bivy) on 03/20/2010 06:56:55 MDT Print View

Agree with Doug, I throw mine straight in the machine, incidentally I have had the same piece for over 2 years now which I use as a ground sheet.

Oh and Thom, looks great

Edited by markmclauchlin on 03/20/2010 06:57:42 MDT.

Thom Darrah
(thomdarrah) - MLife

Locale: Southern Oregon
tyvek GCB on 03/20/2010 07:30:25 MDT Print View

I was not able to recover concept records and drawings following a home computer system meltdown. I will be redoing the concept drawings and hopefully have these available soon.

Tom Kirchner
(ouzel) - MLife

Locale: Pacific Northwest/Sierra
Re: thoms tyvek GCB (ground cover bivy) on 03/20/2010 17:11:04 MDT Print View


Edited by ouzel on 03/20/2010 17:12:06 MDT.

Norman Stoddard
(vacuity) - F

Locale: Northern California
Re: thoms tyvek GCB (ground cover bivy) on 04/03/2010 13:23:09 MDT Print View

I just found this thread with this latest! Nice changes on the top opening and the taper from GCB1 and GCB2 on the original thread where I saw it.

I can't wait to start mine. It will be a great addition to my siltarp style of handling inclement weather conditions. Although in my summer Sierra Nevada backpacking, the GCB will probably be used most often as GC for bedding under the stars.

Thom Darrah
(thomdarrah) - MLife

Locale: Southern Oregon
Thom's tyvek GCB (ground cover bivy) on 04/03/2010 14:20:30 MDT Print View

I have recreated my GCB drawings and will convert to a PDF file. I will,hopefully, have this available soon to email if there is an interest.

FWIW: This is a great project for a Boy Scout group. I volunteered my time and all the required materials for a troop and we made ten of these for an upcoming summer trip. We cut the patterns on one Saturday and bonded on a following Saturday. The boys had a great time, as did I, and they were excited to make something that they would each have the opportunity to use in the field.

If there are BPL members interested in doing this as a scout project I will try to offer support in the form of donated tyvek and fabrication tips.

Edited by thomdarrah on 04/03/2010 14:23:00 MDT.

todd harper
(funnymoney) - MLife

Locale: Sunshine State
Re: Thom's tyvek GCB (ground cover bivy) on 04/03/2010 14:39:02 MDT Print View


That is very generous! Kudos to you for helping the Scouts.

What a great example you set!


Joe Clement
(skinewmexico) - MLife

Locale: Southwest
thoms tyvek GCB (ground cover bivy) on 04/03/2010 14:41:09 MDT Print View

I can see our Troop doing this project. Anxiously awaiting....

Ryan Luke
(rluke) - F

Locale: Atlanta (missing CA)
Thoms tyvek GCB (ground cover bivy) on 04/03/2010 14:58:00 MDT Print View

Wow! A great project and a great idea for a scout group! I am anxiously awaiting the results as well!

Norman Stoddard
(vacuity) - F

Locale: Northern California
Re: Thom's tyvek GCB (ground cover bivy) on 04/03/2010 15:03:38 MDT Print View

I wait with bated breath for PDF.............

Thom Darrah
(thomdarrah) - MLife

Locale: Southern Oregon
Thom's tyvek GCB (ground cover bivy) on 04/03/2010 15:19:59 MDT Print View

I will have the PDF plan available on Monday, PM if interested.

Backpack Jack
(jumpbackjack) - F - M

Locale: Armpit of California
RE GCB on 04/03/2010 17:07:22 MDT Print View

I've been wanting to make one of these, since I have half a role of tyvek just sitting in my garage doing nothing. Nice job Thom sent you a pm. Jack