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  1. #1
    Member
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    Sep 2014
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    Any DIY Open-Cell Foam UQs Out There?

    Open cell foam is obviously a bad idea for ground sleeping because of the way it compresses and soaks up moisture, but it just hit me the other day that it might work well as an under quilt, so I started googling. I found the Supershelter, but I'm curious if anyone has done a DIY version. It seems the challenge would be to eliminate gaps between the pad and the hammock. If you could manage to do that, I think with a simple undercover (polycryo or e-blanket), and an e-blanket over the pad to keep out condensation, it could be a really good winter system for pennies on the dollar compared to down.

    I have built an undercover out of emergency blankets, but it hangs really loosely, so it wouldn't work for this without fixing the way it hangs. I'm thinking I could just get one of those half-inch thick mattress toppers in twin size and cut it into three pieces. Then I just stack in however many of them conditions call for. The undercover would have to be fitted enough to remove gaps but loose enough not to compress the foam.

  2. #2
    Senior Member
    Join Date
    Dec 2013
    Location
    Oregon
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    DIY camo 330D
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    Costco down throw
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    https://www.hammockforums.net/forum/...on-Taco-layout

    There's also a more comprehensive post somewhere; but I do not seem able to find it. The user put together a 3" thick open cell thing and made a hammock shaped thing and said it was good down to below freezing or 0s

    EDIT: It doesnt insulate as well past 50 degrees for me, so I've been using the Costco Down throw triple-layer one which insulates far better.

  3. #3
    Senior Member Country Roads's Avatar
    Join Date
    Mar 2011
    Location
    North Central West Virginia
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    WB Blackbird 1.1 single/MBM UL
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    I expect the drawback would be bulk and maybe weight, but if you are not backpacking, then that would not be an issue. If you make one, be sure and let us know how it works for you.

  4. #4

    Join Date
    Sep 2010
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    Rochester, NY
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    If you look at the foam Hennessy uses in the super shelter it is very light and very porous. Foam is nothing new as far as insulation goes. The first time I saw it was with the Boy Scouts in the 1950's. It supplies a thick layer of cells that restrict air movement thus limiting heat loss. It needs a shell like down. The foam itself needs to have loft power similar to down as in it will expand into the space around a body. Like down it needs a light windproof shell to keep out spray and block the wind. It needs to loft enough to be worth using as in several inches. You do not want anything too stiff as it opens air gaps. For a bottom quilt you might need to cut some wedges out like the darts MacIntyre ir reported to use in his Insultex pads. Look for lumpy spots when somebody is laying in the hammock and relieve them by removing as little as possible so the cuts self close when in use. You also want a differential cut between the top and bottom.
    YMMV

    HYOH

    Free advice worth what you paid for it. ;-)

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