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  1. #1
    New Member NomadicPsyche's Avatar
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    Tarp Loop attachment methods

    I hunted though this sight looking for different attachment methods. I also have a few of my own. I would like to collect all the possibilities into one thread. I am searching for the most elegant way to attach a grosgrain loop to a 1.1 sil-nylon tarp; specifically corners and side attach points. Ridge lines are pretty strong with flat felled seams attached to webbing, so they are sort of a no brainier.

    Here are the methods I have collected so far in no particular order. Comments are desired. If you have a different method send it my way and I’ll make a nice diagram.
    One of the tangential questions I am pondering is; how strong does a loop need to be?

    All testes were preformed with regular Gutterman 100% polyester thread

    Test #1
    ” double fold perimeter hem: attach the ”grosgrain loops to the hem only with bar stitches parallel to the hem.
    Result: Threads ripped lifting a 30 pound weight.

    Test #2
    “ double fold perimeter hem with 8” of ” webbing sandwiched inside, attach ” grosgrain to one side of hem with bar stitches parallel to the hem.
    Result: Thread ripped lifting a 50 pounds, The tarp had no visible damage except for the missing loop. Repairs would be a snap.

    Test #3
    4mm rolled hem with special presser foot. A layer of 1.1 sil-nylon patch, edges folded once and hemmed. ” Grosgrain attached to one side of patch with bar stitches parallel to the hem.
    Result: Threads ripped lifting a 30 pound weight. No damage to tarp.

    Test #3.1
    Same as test 3 but sandwich the tarp and patch between the ” gross grain loop.
    Result: Things are getting interesting, lifted up 50 pounds of static weight. When I started to bounce the material on the weight it finally failed with some very aggressive bouncing. Loop tore off, hole in the rip stop, but amazingly the hem is still there.

    Test # 4
    4mm rolled hem with special presser foot. A layer of 1,1 sil-nylon patch, not hemmed. 1” grosgrain sandwiching the tarp. 3mm wide and long zigzag stitch to attach patch to tarp body. 2mm wide and long zigzag stitch to attach grosgrain to tarp. The stitches were perpendicular to the hem.
    Result: I can lift 52.5 pounds (top range of barbell) of weight and can bounce the weight very aggressively and there is no failure. Since I did not hem the patch edges… they are fraying badly, I need to fix that on the next test. What I think I am observing it the transfer and dissipation of force to the tarp in gradual steps. It seems I stopped fighting things with brute force and rather just went with the stretch of the materials.
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    Last edited by NomadicPsyche; 03-11-2011 at 13:25. Reason: spelling error
    "It's all a vicious Mobius strip of stress" Jack Wallen

  2. #2
    New Member NomadicPsyche's Avatar
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    "It's all a vicious Mobius strip of stress" Jack Wallen

  3. #3
    Senior Member animalcontrol's Avatar
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    Cool!!
    thanks for the research and the very informative write-up!

    good to know!
    "Every day is a new day to a better future"
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  4. #4
    Senior Member PuckerFactor's Avatar
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    Very cool tests, Nomad! And well done compilation, too.
    I've always put my reinforcements on the opposite side as the tieout, kinda like this:
    test 3-2.jpg
    I wonder if that would have made any difference in test 3.

    PF
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  5. #5
    Syb's Avatar
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    Way to go fellow Jerseyan! You should check out the MAHHA hang thread and show off your skills. Great research. I have not attempted a tarp but I'll "go to school" on what you've done if I ever get there.
    Syb
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  6. #6
    New Member NomadicPsyche's Avatar
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    Test #5 (probably the last)

    1. Create a triangle patch from 1.1 sil-nylon. Hem exposed edges inch fold once. Use a string 2.5mm stitch to hem.
    2. Use a 4mm rolled hem with special presser foot. 2.5mm straight stitch. Feed raw edge of patch through.
    3. Sew patch to the tarp with a 1.5mm long & wide zigzag stitch
    4. Sew 1” grosgrain to the tarp top with a 1.5mm long & wide zigzag stitch parallel to the edge
    5. Sew 3, 1.5mm long & wide zigzag stitch from the base of the hem out. One left one center and one right.



    Result: I can lift 100 pounds (strap together two barbells) of weight. I tested this 5 times and observed no visible wear at all. This is the most elegant design I could come up with and it is amazingly simple to accomplish.
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    Last edited by NomadicPsyche; 03-12-2011 at 21:59. Reason: spelling errors
    "It's all a vicious Mobius strip of stress" Jack Wallen

  7. #7
    New Member NomadicPsyche's Avatar
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    Quote Originally Posted by PuckerFactor View Post
    Very cool tests, Nomad! And well done compilation, too.
    I've always put my reinforcements on the opposite side as the tieout, kinda like this:
    test 3-2.jpg
    I wonder if that would have made any difference in test 3.

    PF
    I think the attachment would only be as strong as the stitch. The stitch strength is apparently a wild card based on thread, length, ect...

    I don't think it's bad, and if it works then why fix it.

    I tried sandwiching for the first time because I suspect the "webbing to webbing" stitches can get really strong. Example: tree huger strap loops. I am hopping the sandwich effect adds strength. Then again I may be delusional

    In the past I have always just used a double fold hem and sewn loops under the tarp, very similar to your method.

    But for my next trip I am building gear for 6 guys and I need to streamline my normal time consuming procedures. Getting a 1/2" double folded hem nice and neat takes time, ironing and pinning. I wanted a speeder method but did not want to give up on strength.

    Thats why I tested all these methods. Hope others can benefit too!!
    Last edited by NomadicPsyche; 03-12-2011 at 23:07.
    "It's all a vicious Mobius strip of stress" Jack Wallen

  8. #8
    Redoleary's Avatar
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    Thats all really good info, thanks for sharing.
    Good luck,
    RED

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  9. #9
    Senior Member rjcress's Avatar
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    Outstanding post.
    Thanks so much for sharing!
    "I keep telling myself that if I make perfect seams, nobody will believe that I made it... " -JohnSawyer

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  10. #10
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    Strong enough; tho I would have done it differently.

    I don't like rough edges on tape that light so I would have folded over and stitched straight across the webbing with three runs of straight stitch, I would also have used the same 3 runs of stitching along your rolled seam joining both runs with the ubiquitous "X"

    First post on this forum and it's a critique LOL

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