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  1. #1
    Senior Member gRaFFiX's Avatar
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    Silnylon Underquilt

    Hey guys, I need to make an underquilt for my BB but I only need it for summer temps here in Cali. So my question is whether or not silnylon would work as an underquilts outer layer? I realize that the concensus is that sil is not breathable, but I would think that would be optimal considering I want to block wind.

    Humidity in Northern California isn't much of a problem, especially at altitude during the night, and since the underquilt is under the hammock, wouldn't there be minimal condensation anyways?

    I have an Idea to use the sil as an outer layer and sew it to a material that will not only provide warmth, but is extremely lightweight. I won't mention what it is because I am not yet sure if the material can be sewn; making my idea moot.

    Has anybody tried this in similar conditions with either success or failure? I really could use your feedback on the best material to use as you all have vastly more knowledge than myself, and I want a better understanding of my materials before I invest in them.

    Thank you in advance for any insight.
    Those who expect disappointment are never disappointed.

  2. #2
    Senior Member fin's Avatar
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    I would recommend a landscape fabric UQ. I made one in spring, and it has worked great as a warm weather UQ. Sew a layer of breathable ripstop on the outside, and use the landscape fabric as an inner liner. Very inexpensive and it is just the ticket down to ~60*. I never got around to the trip report with it, but I use it almost every night in my backyard, and I did use it on the NCT trip.

  3. #3
    Senior Member gRaFFiX's Avatar
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    That landscape fabric was a good idea (i read your thread when you posted it) but as for the ripstop, I still want to know if silnylon would be a viable option? Hasn't anybody tried it in an underquilt?
    Those who expect disappointment are never disappointed.

  4. #4
    Senior Member fin's Avatar
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    I've tried a variety of non-breathable materials as a UQ, but not sil. For the most part, all non-breathable materials I have tried have caused back sweating or condensation. Sewn to some kind of insulation, it would probably act similar to a non-breathable pad, just a lot more comfortable in the hammock. If you don't sweat on a pad, you would probably be ok with a sil UQ. I can't use a non-breathable material for a UQ or even a pad most of the time. I just get a clammy back.

  5. #5
    Senior Member gRaFFiX's Avatar
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    well that is helpfull. What is the humidity and temp at night like where you normally hike? I would presume pretty cold.
    Those who expect disappointment are never disappointed.

  6. #6
    Senior Member fin's Avatar
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    Summer time, humidity is normally between 50-80%. Temps this week have been in the 50's and 60's at night. That's pretty normal for this neck of the woods.

  7. #7
    Senior Member gRaFFiX's Avatar
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    that's about what it is at alti in cali. I like your landscape fabric, and thanks for the help, I think I'm gonna try the sil as I got a line right now on .07oz per sq yard for less than $10. I'll post my findings.
    Those who expect disappointment are never disappointed.

  8. #8
    the problem is water vapor coming off of you goes into the quilt and can't evaporate to the outside because of the sil. is there insulation in this thing by the way? if not you might be ok, but i think any insulation could get wet from body vapor because the moisture couldn't pass through.

    i have done some synthetic insulation quilts with sil shells, but both shells (inside and outside) were both sil, so body vapor couldn't get to the insulation in the first place. those worked well and did seem to cut wind better than dwr.

    check the fabric you got. if it's really 0.7 oz/yd i doubt it's sil, never seen sil less than 1.3, that's about half the weight. you're talking cuben fiber weight at 0.7 so i'd say you've got something else.

  9. #9
    Senior Member fin's Avatar
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    Quote Originally Posted by warbonnetguy View Post
    i have done some synthetic insulation quilts with sil shells, but both shells (inside and outside) were both sil, so body vapor couldn't get to the insulation in the first place. those worked well and did seem to cut wind better than dwr.
    I've heard that those quilts were excellent, btw.

    Yeah, that's what I was implying/trying to say as well. Both sides would need to be sil, and then it would act similar to a non-breathable pad, just conforming to the hammock body instead of the hammock body conforming to it. And the fact that it is outside the hammock.

  10. #10
    Dutch's Avatar
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    I made an UQ with the top layer (the one against the hammock) out of sil and the bottom layer made out of 1.1 w/ DWR. It works just as I hoped. I have heard that the sil would feel clammy, but I haven't noticed it at all. I do think it works well as a wind break. My only fear with both shells being sil is if it got wet i wouldn't be able to dry it in the field. I also imagine that if it was all sil it may prevent some loft since air will struggle to get in. How warm is summer in Cali anyhow and what are you using for insulation?
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