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thoms tyvek GCB (ground cover bivy)
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Home › Forums › Gear Forums › Make Your Own Gear › thoms tyvek GCB (ground cover bivy)
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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 #1506633Hi, 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
Jun 9, 2009 at 5:24 am #1506892Thom,
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 #1506897All 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 #1586850Any 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 #1588301Thom,
Did you get your computer issues ironed out? Would love to see your plans/drawings.
Z
Mar 19, 2010 at 10:24 pm #1588642I 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 #1588643When 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 #1588658For this kind of application I would think that soft/clothing Tyvek would work much better than Housewrap.
FrancoMar 20, 2010 at 5:56 am #1588680Agree 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
Mar 20, 2010 at 6:30 am #1588682I 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 #1588845AnonymousInactivenm
Apr 3, 2010 at 12:23 pm #1593868I 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 #1593879I 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 #1593880Thom,
That is very generous! Kudos to you for helping the Scouts.
What a great example you set!
Todd
Apr 3, 2010 at 1:41 pm #1593884I can see our Troop doing this project. Anxiously awaiting….
Apr 3, 2010 at 1:58 pm #1593891Wow! 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 #1593892I wait with bated breath for PDF………….
Apr 3, 2010 at 2:19 pm #1593899I will have the PDF plan available on Monday, PM if interested.
Apr 3, 2010 at 4:07 pm #1593926I'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
Apr 3, 2010 at 9:22 pm #1594010Thom, 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 #1594462I 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 #1594833WARNING !!!!!!!!!!!!!!!
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 #1595025Thom what are you using to bond the tyvek together? Thanks Jack
Apr 6, 2010 at 8:07 pm #1595051I 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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