Page 1 of 2 12 LastLast
Results 1 to 10 of 17
  1. #1
    New Member Yetee's Avatar
    Join Date
    Nov 2011
    Location
    Salt lake, utah
    Hammock
    Grand trunk ultra light
    Tarp
    Tbd
    Insulation
    Underquilt: ppef
    Suspension
    Webbing
    Posts
    10

    question regarding IX vs. straight plastic sheeting

    Ok, I am fairly new to hammocks and have been lurking here for a while just trying to learn. I have a question regarding underquilts made with IX vs one made of thin polyethylene sheeting. Since IX is basically a vapor barrier with perforations couldn't one use plastic sheeting that was perforated in its place? (this stemmed from a thread where IX was replaced with perforated PEF).

    IX has an R value of 1.76 and a thickness of .02 inches while 2 layers of 5 mil PE have an R value of 1.5 and a thickness of .01 inches.

    Has anyone tried this? or am I missing something important as to why no one has tried it? I may just be over thinking this and it wont work at all.....

    I think I may try it out sometime as I have a plethora of PE sheeting, just a matter of finding the time to put it all together.

  2. #2
    Senior Member dejoha's Avatar
    Join Date
    Jun 2009
    Location
    Flagstaff, AZ
    Hammock
    Most
    Tarp
    GoLite Poncho Tarp
    Insulation
    Phoenix, Burrow
    Suspension
    Whoopie Hook
    Posts
    2,245
    Images
    207
    I think Mac would be the one to answer here -- I think he has the most experience working with IX and variants. You might ping him with a PM too.

  3. #3
    MacEntyre's Avatar
    Join Date
    Sep 2007
    Location
    Jamestown, NC
    Hammock
    Molly Mac Gear
    Posts
    7,627
    Images
    6
    Quote Originally Posted by Yetee View Post
    Since IX is basically a vapor barrier with perforations couldn't one use plastic sheeting that was perforated in its place?
    Insultex is PE foam quilted with a polypropylene scrim on both sides. PE sheeting doesn't insulate as well as PE foam.

    Quote Originally Posted by Yetee View Post
    (this stemmed from a thread where IX was replaced with perforated PEF).
    PEF = PE Foam. The perfs help you pack it, by letting air esape... otherwise the perfs had no effect. PPEF is difficult to distinguish from Insultex, once it is encased in nylon.

    Quote Originally Posted by Yetee View Post
    IX has an R value of 1.76 and a thickness of .02 inches while 2 layers of 5 mil PE have an R value of 1.5 and a thickness of .01 inches.
    IIRC, 0.03" (1/32") Insultex and PEF both have an R value of 3.

    Quote Originally Posted by Yetee View Post
    Has anyone tried this?
    Ed Speer did some testing using PE sheet as an outer cover for his winter rig. He is a very cold sleeper... not certain if he came to any conclusions.

    I would be reluctant to use a vapor barrier outside my insulation in real cold, for fear of condensation getting the insulation wet. However, for mild weather, it should do pretty well.
    "We must, indeed, all hang together or, most assuredly, we shall all hang separately." - Ben Franklin
    www.MollyMacGear.com

  4. #4
    New Member Yetee's Avatar
    Join Date
    Nov 2011
    Location
    Salt lake, utah
    Hammock
    Grand trunk ultra light
    Tarp
    Tbd
    Insulation
    Underquilt: ppef
    Suspension
    Webbing
    Posts
    10
    yeah I was unsure if the perorations aided in reducing condensation at all, if they just make it pack better and PEF is not a true vapor barrier than my idea wont work I suppose.

    the R value of 1.76 came from insultex's web site. they list it as .02" and a Clo value of 2.0, which when converted gives R1.76 for a single layer.

    Thank you for helping me understand a little better how IX works.

  5. #5
    MacEntyre's Avatar
    Join Date
    Sep 2007
    Location
    Jamestown, NC
    Hammock
    Molly Mac Gear
    Posts
    7,627
    Images
    6
    Quote Originally Posted by Yetee View Post
    ... if ... PEF is not a true vapor barrier than my idea wont work I suppose.
    PEF is a vapor barrier.

    Insultex, being perforated, is vapor permeable to a very small extent. However, for all practical purposes, it is a vapor barrier!

    - MacEntyre
    "We must, indeed, all hang together or, most assuredly, we shall all hang separately." - Ben Franklin
    www.MollyMacGear.com

  6. #6
    Senior Member greggg3's Avatar
    Join Date
    May 2007
    Location
    ohio
    Hammock
    HH Deep Jungle Zip XL
    Tarp
    MacCat deluxe
    Insulation
    down
    Suspension
    whoopie sling
    Posts
    239
    Wow, I didn't realize the R value of this stuff was so high. From cascadedesigns website, a z-rest has an R value of 2.2 and its 3/4" thick while the IX has an R value of 1.75 at 0.02" thick? Am I confusing the ratings? 2 layers of IX is warmer than a z-rest?

  7. #7
    Senior Member greggg3's Avatar
    Join Date
    May 2007
    Location
    ohio
    Hammock
    HH Deep Jungle Zip XL
    Tarp
    MacCat deluxe
    Insulation
    down
    Suspension
    whoopie sling
    Posts
    239
    Oh yeah, where do you buy this stuff at?

  8. #8
    Member The Wolf in a Hammock's Avatar
    Join Date
    Nov 2011
    Location
    Flint, Mi
    Hammock
    Travel Hammock
    Tarp
    ExpeditionExplorer
    Insulation
    DIY IX TQ and UQ
    Suspension
    SLS
    Posts
    60
    You can get insultex here http://diygearsupply.com/
    I made an under quilt and top quilt and they work pretty well so far

  9. #9
    Senior Member greggg3's Avatar
    Join Date
    May 2007
    Location
    ohio
    Hammock
    HH Deep Jungle Zip XL
    Tarp
    MacCat deluxe
    Insulation
    down
    Suspension
    whoopie sling
    Posts
    239
    Thanks Wolf - is the R value right? It seems incredibly high - maybe I don't understand how the rating works, do you have to multiply by the thickness to get the total insulative value?

  10. #10
    Senior Member
    Join Date
    Oct 2011
    Location
    Benbrook, Texas
    Hammock
    WBBB 1.7 double
    Tarp
    Hennessy Hex
    Insulation
    KAQ UQ
    Suspension
    Whoopee Slings
    Posts
    172
    Quote Originally Posted by MacEntyre View Post
    PEF is a vapor barrier.

    Insultex, being perforated, is vapor permeable to a very small extent. However, for all practical purposes, it is a vapor barrier!

    - MacEntyre
    Is this a vapor barrier? If not will the UQ create condensation if you use a UQP made by 2QZQ that is breathable?

Similar Threads

  1. Burrow question, half taper or straight taper?
    By Pakman in forum Hammock Gear
    Replies: 20
    Last Post: 01-01-2014, 10:20
  2. Let's talk plastic (sheeting)
    By DemostiX in forum Do-It-Yourself (DIY)
    Replies: 5
    Last Post: 03-18-2012, 18:17
  3. Cat Cut vs. Straight Cut
    By grich9860 in forum Weather Protection
    Replies: 11
    Last Post: 06-09-2011, 19:38

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •