Mar 17, 2008 at 10:44 am #1227864
Attached are a few pictures of the latest prototype of my tyvek GCB project.Jun 8, 2009 at 8:30 am #1506633
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. ThanksJun 9, 2009 at 5:24 am #1506892
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.
Thanks.Jun 9, 2009 at 5:44 am #1506897
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.Mar 15, 2010 at 6:50 pm #1586850
Any news on this project? I am thinking about making a bivy either sewing silnylon or bonding Tyvek. Any pattern online?Mar 19, 2010 at 10:49 am #1588301
@zandarLocale: Central Coast of California
Did you get your computer issues ironed out? Would love to see your plans/drawings.
ZMar 19, 2010 at 10:24 pm #1588642
@trebiskyLocale: Southern Arizona
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.Mar 19, 2010 at 10:31 pm #1588643
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.Mar 20, 2010 at 12:37 am #1588658
For this kind of application I would think that soft/clothing Tyvek would work much better than Housewrap.
FrancoMar 20, 2010 at 5:56 am #1588680
@markmclauchlinLocale: Western Australia
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 greatMar 20, 2010 at 6:30 am #1588682
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.Mar 20, 2010 at 4:11 pm #1588845
@ouzelLocale: Pacific Northwest/Sierra
nmApr 3, 2010 at 12:23 pm #1593868
I just found this thread with this latest prototype…wow! 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.Apr 3, 2010 at 1:20 pm #1593879
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.Apr 3, 2010 at 1:39 pm #1593880
@funnymoLocale: Sunshine State
That is very generous! Kudos to you for helping the Scouts.
What a great example you set!
ToddApr 3, 2010 at 1:41 pm #1593884
I can see our Troop doing this project. Anxiously awaiting….Apr 3, 2010 at 1:58 pm #1593891
@rlukeLocale: Atlanta (missing CA)
Wow! A great project and a great idea for a scout group! I am anxiously awaiting the results as well!Apr 3, 2010 at 2:03 pm #1593892
I wait with bated breath for PDF………….Apr 3, 2010 at 2:19 pm #1593899
I will have the PDF plan available on Monday, PM if interested.Apr 3, 2010 at 4:07 pm #1593926
@jumpbackjackLocale: Armpit of California
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. JackApr 3, 2010 at 9:22 pm #1594010
Thom, I am a neophyte with respect to bivy or tent/tarp construction. Can you explain the difference between overlap seams and bonded seams?Apr 5, 2010 at 11:50 am #1594462
I emailed out today a pdf drawing for my tyvek GCB to all who contacted me requesting this information. Please PM or email with any specific questions.
I sent out 12 pdf drawings just today. Have fun.Apr 6, 2010 at 11:28 am #1594833
To all I emailed out my pdf drawing to. I noticed a mistake on the pdf drawing that needs correction. Step 1 ends with "Cut". This is not correct, a person should "Cut" at the end of Step 2 (along the outer 2" seam allowance line).
I have corrected the pdf and can resend or you can note the change/correction on your copy. I apologize for any inconvenience this error may have caused.
You try to be helpfull and this happens. :(Apr 6, 2010 at 6:47 pm #1595025
@jumpbackjackLocale: Armpit of California
Thom what are you using to bond the tyvek together? Thanks JackApr 6, 2010 at 8:07 pm #1595051
I have had very good results using 3M Super 77 spray adhesive. In non scientific destructive testing the bonded seam is stronger then the material itself.
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