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  1. #1
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    How much does bottom insulation compensate for top insulation?

    Hi,

    I have kind of a silly question:

    I have a HG 0°F Incubator full UQ (awesome btw…) that served me very well all winter long and allowed me to discover the joys of hammocking in the cold.

    Let say the temperature planned for my tomorrow trip in the woods are way above that but still cold(~0°C = ~32°F ) and I am reluctant to pack my heavy winter sleeping bag plus the UQ.
    Would I be fine with a +5°C sleeping bag (40°F), hoping the over-insulation in the bottom will compensate for the under-insulation at the top or is this kind of reasoning completely hazardous?

    What do you think?

  2. #2
    Senior Member MAD777's Avatar
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    Since its a sleeping bag, you could practically double it over you with all the excess material. Plus, you can wear a warm jacket to sleep in. Extra clothing boost top quilt performance but don't do anything for the underquilt.
    Mike
    "Life is a Project!"

  3. #3
    Senior Member JasonJones's Avatar
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    I've found that to be true with my hanging. But I am a really hot sleeper, so your milege may vary... @25f a 10deg underquilt or so + 40deg bag kept me very warm, I had to vent multiple times during the night.

    Maybe bring a long a liner "just in case" to drop that bag 10deg... I bet you wont need it.

  4. #4
    Senior Member nimbus37's Avatar
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    Similar question

    I have a 40 degree uq, if I use that during a night that will drop into the 60's, do I need any tq? I don't think I will.
    Nimbus37

  5. #5
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    Thank you all for your replies.

    The weather forecast just worsened a tiny bit, it might drop to -2°C (~ 28°C), so a 5°C SB might be stretching it a bit…
    I'll drop a coin tomorrow just before leaving: weight vs warmth? ^__^

    On a side but similar note: how low do you think it is possible to sleep well with a good wool blanket AND an amazing 0° Incubator UQ?

    – sorry for my approximate english… –

  6. #6
    Senior Member Bubba's Avatar
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    I think the UQ can compensate for a thinner topquilt. Its like wearing a jacket opened. I feel warm if my back is warm. As mentioned, clothes can compensate for the TQ.
    Don't let life get in the way of living.

  7. #7
    Senior Member TinaLouise's Avatar
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    Quote Originally Posted by Pendule View Post
    Hi,

    Would I be fine with a +5°C sleeping bag (40°F), hoping the over-insulation in the bottom will compensate for the under-insulation at the top or is this kind of reasoning completely hazardous?

    What do you think?
    For me, I've found this to be true... over insulation on the bottom and I can use less insulation on the top. I did have to test in different temps to find out the lowest temps I could use the light weight summer top quilt with my heavy bottom quilt and still be warm at. Something else I always carry is a length of silk material. If the temps dip at night and my light weight summer top quilt isn't enough, then adding the silk sheet has kept me warm. Plus adding any extra clothes that I'm carrying.

  8. #8
    Senior Member dant8ro's Avatar
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    I did a personal record winter hang with my 3 season top quilt. (-26 C). You can always toss some down clothing on top to keep you warmer.

  9. #9
    Senior Member USMCStang's Avatar
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    I have a DIY winter UQ that I would estimate to be a 0F for most people, it would probably take me to at least -15F.

    I use a 40F Down sleeping bag as a top quilt almost year round, and have used it in combination with my winter quilt to a low of 10F thus far and I was warm, so I would say that yes, a 40 degree F sleeping bag will keep ME warm in combination with a heavy UQ. In your case, I would say you are fine to take the 5C/ 40F bag, but ultimately, I can only base that on how I sleep.
    Mike, Backcountry Mentor
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  10. #10
    Senior Member DemostiX's Avatar
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    30F below SB rating and comfy?

    Must be a Marine or something.

    At OP's original hypothetical, no problem. I'm good 12C below a 40F /4C rating. All of that with a 20F / -6C rated HG UQ. In a not-too-big hammock, so the sides were well covered by the UQ.

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