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  1. #31
    Senior Member HappyHiker's Avatar
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    Quote Originally Posted by mrmike65 View Post
    I wonder why a pad causes a condensation problem in a hammock when it doesn't when used on the ground.
    I think it's because you have a lot more contact area using it in a hammock- it wraps the back, shoulders/arms and legs. On the ground it touches only contact points on the back, arms and legs.

    Also, less movement while sleeping. I either find myself in the same position I fell asleep in, or at most wake once or twice to shift positions. When sleeping on the ground I move around quite a bit more allowing any condensation to dry that may have accumulated.
    Experience is the worst teacher - it presents the exam first and the lesson later. - Unknown

  2. #32

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    @ HappyHiker: sounds logical. Thanks for the input.

    I wonder if the fact that most hammock setups are near-enclosed environments doesn't have something to do with it as well. I've never used a bivy sack. Does anyone here have experience with sleeping on a pad in a bivy sack that they could speak on the issue of condensation in that environment?

  3. #33
    Senior Member HappyHiker's Avatar
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    Quote Originally Posted by mrmike65 View Post

    I wonder if the fact that most hammock setups are near-enclosed environments doesn't have something to do with it as well. I've never used a bivy sack. Does anyone here have experience with sleeping on a pad in a bivy sack that they could speak on the issue of condensation in that environment?
    Personally I find hammocks to be very open enviornments - lots of air movement through the tarp area (dependent on doors, materials, height of sidewalls from the ground etc.). Most of the condensation I see in a hammock is on the pad, bag/quilt where I breathed on it all night and occasionally on the tarp (but Colorado is generally a very dry area). The worst being on the pad, where it's trapped and has little/no air circulation.

    As for a bivy, IME they do increase condensation everywhere (especially when closed due to weather). Far worse than a hammock. Of course my bivy is a 15+ year old gore tex model. There are quite a few fabrics that are newer and more breathable that are able to reduce condensation in theory - but I haven't tried them.
    Experience is the worst teacher - it presents the exam first and the lesson later. - Unknown

  4. #34

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    Thanks for your response. Perhaps, I'm seeing a more closed environment because I may be setting my hammock too close to my tarp. That the difference in condensation between using a pad on the ground vs. in a hammock is that the pad in a hammock has more contact with your body doesn't seem to add up. The bottom of a hammock is subject to more airflow, is it not?

    Ahh... the missing factor could be because the bottom of the hammock is exposed to cooler air and there is a heat bank just on the other side of the pad. Condensation being the result of cooler air meeting warmer air.

    I wonder if there is a way to "break" the cool air/warm air condensation cycle by using thin layers of insulation alternated with layers of non-conductive or reflective layers. Say... three layers of Insultex, alternated with two layers of Mylar, in a shell of 1.1oz RSN. I would guess that a 3/4 pad would be < 1/2" thick and weigh about 8oz. Fashioned correctly, a pad 30" by 48" could be worn as a vest.

  5. #35
    Senior Member Randy's Avatar
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    There is absolutely nothing wrong with those Walmart ccf pads. The green GI pads are a little wider and about $15.00 more.
    "Proud Pound Hawg"
    Republic of Texas H.O.G. (Hennessy Owners Group)

  6. #36

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    Do you find there is no issue with condesation with your pad?

  7. #37
    Senior Member Randy's Avatar
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    I get some condensation sometimes.. but the cost of a pad versus an underquilt,I am just fine with using a ccf pad.
    I am sure that the underquilts are great, but so is a rolex........
    "Proud Pound Hawg"
    Republic of Texas H.O.G. (Hennessy Owners Group)

  8. #38
    Senior Member HappyHiker's Avatar
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    Quote Originally Posted by mrmike65 View Post
    Thanks for your response. Perhaps, I'm seeing a more closed environment because I may be setting my hammock too close to my tarp. That the difference in condensation between using a pad on the ground vs. in a hammock is that the pad in a hammock has more contact with your body doesn't seem to add up. The bottom of a hammock is subject to more airflow, is it not?

    Ahh... the missing factor could be because the bottom of the hammock is exposed to cooler air and there is a heat bank just on the other side of the pad. Condensation being the result of cooler air meeting warmer air.

    I wonder if there is a way to "break" the cool air/warm air condensation cycle by using thin layers of insulation alternated with layers of non-conductive or reflective layers. Say... three layers of Insultex, alternated with two layers of Mylar, in a shell of 1.1oz RSN. I would guess that a 3/4 pad would be < 1/2" thick and weigh about 8oz. Fashioned correctly, a pad 30" by 48" could be worn as a vest.
    Even with the tarp riding my RL, theres still much better airflow than in a tent (unless the tarp is so tight against the hammock it's creating an OC (over cover).

    Condensation can occur from several different sources - either from moisture in the atmosphere (cold glass of liquid on a hot day for example), or from you (warm hand on a cold window or mirror). In the situation of a pad, it's the latter. The pad is a VB which will not allow water through - the moisture is being generated by you and with no avenue to escape, it collects. The temp differential has some effect, but it's not the predominant factor. Wear a trashbag as a shirt on a warm day - guaranteed you'll generate moisture even with a lack of temp differential. That's one reason UQ's are so highly regarded - they breathe well.

    Insultex and space blankets are VB's as well. You may move the collection point further from you, but it will still collect.

    HTH
    Experience is the worst teacher - it presents the exam first and the lesson later. - Unknown

  9. #39
    hangNyak's Avatar
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    I cut my WW pad to 3/4 length and made an SPE. The cut off portion of the pad I used to make the "wings" for shoulder and hip areas. It works well. I have had no moisture issues, but I have only had it to 60*. Here is a pic.

    RON

    A tree's a tree. How many more do you need to look at? ~ Ronald Reagan

  10. #40

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    Thanks for the clarifcation, HappyHiker, and for sharing your pic, hangNyak. I have plenty to think about now. Much appreciated!

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