Page 1 of 4 123 ... LastLast
Results 1 to 10 of 39
  1. #1
    Senior Member Albert Skye's Avatar
    Join Date
    Jun 2009
    Location
    coastal B.C.
    Hammock
    DIY (&c.)
    Posts
    378

    insulating with foam sheets

    This thread is for general discussion of the design and construction of insulation made from foam sheet (whether it be Insultex or one of the various polyethylene/polypropylene materials made for shipping/packaging/&c.).

    Foam sheet appears to work well for insulation, especially when two or more layers are used and those layers are separated to minimise heat conduction. MacEntyre has been using pleats (InsulTubes) but I think there is opportunity for improvement.

    Using a separate layer of expanded mesh made from foam sheet seems promising. It's labour-intensive (though easily tooled once the dimensions are optimised) but I think it would work well.

    Alternatively, the layers could be separated with a replaceable air bladder (plastic bag), a little down, found materials (dry leaves/grass), by direct inflation (assuming airtight material and construction), &c.
    Attached Images Attached Images

  2. #2
    Senior Member LostCause's Avatar
    Join Date
    Jul 2008
    Location
    Houston, Tx
    Hammock
    WBBB; Bridge in progress
    Tarp
    DIY Hex
    Insulation
    Short UQ/pad combo
    Suspension
    Whoopie Slings
    Posts
    692
    Images
    19
    I don't have anything to add other than I think your idea is interesting and would like to see how this develops.

  3. #3
    Senior Member Stovemandan's Avatar
    Join Date
    Oct 2009
    Location
    Rockford, IL
    Hammock
    GrizzBridge
    Posts
    664
    Great idea!!! This material should work between the sheets to create air gap:

    http://www.ruralking.com/6-in-x-20-f...30353830303436
    Last edited by Stovemandan; 08-10-2010 at 09:33. Reason: spelling error
    Coming soon: Fancee Feest teams up with "El Conquistador"

  4. #4
    Senior Member WV's Avatar
    Join Date
    Feb 2008
    Location
    southeast WV
    Hammock
    DIY
    Posts
    4,147
    Images
    207
    Yes, indeed! Very promising. What's the scale of your photo? How long are the slits in the expanded mesh? Do you think slits as long as 6" would work?

  5. #5
    Member Zac's Avatar
    Join Date
    Jan 2010
    Location
    Tulsa, OK
    Hammock
    DIY by Smokehouse
    Tarp
    DIY by Smokehouse
    Insulation
    Burrow/Incubator
    Suspension
    whoopie sling
    Posts
    50
    Maybe use a foam or pvc shelf liner. Kinda like a http://www.stacksandstacks.com/shelf-liner-grip-it

  6. #6
    Senior Member turnerminator's Avatar
    Join Date
    Sep 2009
    Location
    Peterborough,UK
    Hammock
    DIY Pertex
    Tarp
    DIY with doors on
    Insulation
    Down and synthetic
    Suspension
    Whoopies & hooks
    Posts
    1,339
    I have always been impressed with the added warmth that windscreen sun-shades give.

    At 70g each, they seem to punch well above their weight. 4 of them weigh about the same as a thick ccf pad, but seem to offer more warmth.

    A hammock sized thin foam layer with a layer of aluminised mylar glued to it, then a layer of foam mesh stuck to the mylar?

    I'm thinking that the solid foam at the back of the mylar would stop heat conducting from the aluminium to the bottom layer of the hammock and into the air. The foam mesh would allow the thin layer of air to be kept between the mylar that is needed to make this kind of insulation more effective.

  7. #7
    Senior Member Albert Skye's Avatar
    Join Date
    Jun 2009
    Location
    coastal B.C.
    Hammock
    DIY (&c.)
    Posts
    378
    Stovemandan, Zac: My aim is to minimise weight and volume, and increase flexibility; i.e., both of the suggested materials are far too heavy for me. In any case, it's very easy to make expanded mesh.

    Quote Originally Posted by WV View Post
    What's the scale of your photo? How long are the slits in the expanded mesh? Do you think slits as long as 6" would work?
    I've not made any experiments yet (perhaps better to leave that to others with proven testing skills ) but I have seen that if the pitch (spacing between slits) is too small, or the slit length is too long, the mesh tends to flatten. One solution is to use a slightly thicker foam, perhaps 2 mm. It need not be closed-cell.

    Quote Originally Posted by turnerminator View Post
    I have always been impressed with the added warmth that windscreen sun-shades give.

    [...]

    A hammock sized thin foam layer with a layer of aluminised mylar glued to it, then a layer of foam mesh stuck to the mylar?
    I'm not sure exactly what kind of product you have in mind; most of the sun shades around here are aluminised bubble sheet.

    As I understand it, most materials reflect IR, and I imagine the white PE/PP has high IR reflectance but it would be good to know for sure.

  8. #8
    MacEntyre's Avatar
    Join Date
    Sep 2007
    Location
    Jamestown, NC
    Hammock
    Molly Mac Gear
    Posts
    7,652
    Images
    6
    I used a nylon mesh on the inside of my Thermadrape KAQ that I sold to Rilmoigan. The mesh is same stuff that is used for athletic jerseys. It's a little heavy, but I believe it performed just as you suggested, Albert.

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

  9. #9
    Senior Member WV's Avatar
    Join Date
    Feb 2008
    Location
    southeast WV
    Hammock
    DIY
    Posts
    4,147
    Images
    207
    I took a 60" x 60" piece of Insultex and used the sewn diamond grids to locate slits (folded the IX and used scissors to cut a slit in each diamond). Here's a photo. I hung it on my grape arbor to see how much it would stretch. I'll use it as the middle layer of full length Ix UQ, 45" x 75". If I had cut the slits a bit longer it probably would have stretched even more, but I didn't want to weaken the Ix too much. I will probably use some of the adhesive transfer tape that I've been experimenting with to tack it to the top and bottom layers so the UQ will maintain a consistent thickness (bottom layer won't sag).
    Last edited by WV; 08-10-2010 at 13:23.

  10. #10
    MacEntyre's Avatar
    Join Date
    Sep 2007
    Location
    Jamestown, NC
    Hammock
    Molly Mac Gear
    Posts
    7,652
    Images
    6
    That's very clever, Dave!

    Did you notice that IX is stronger in one direction than the other? Stormcrow pointed that out to me...

    You should slit it in the direction of the strength.
    "We must, indeed, all hang together or, most assuredly, we shall all hang separately." - Ben Franklin
    www.MollyMacGear.com

Similar Threads

  1. PolyCro Sheets
    By tgbrowning in forum Do-It-Yourself (DIY)
    Replies: 5
    Last Post: 12-21-2012, 10:51
  2. SOLD: 2 wide sheets of 1/4" Minicell Foam
    By KP in forum [SOLD/WITHDRAWN] Items no longer available
    Replies: 4
    Last Post: 01-06-2012, 10:21
  3. Wait, what about my bed sheets?
    By Paladin03 in forum Warbonnet Hammocks
    Replies: 20
    Last Post: 02-20-2011, 13:49
  4. sleeping sheets
    By LyttleBryan in forum General Hammock Talk
    Replies: 11
    Last Post: 10-22-2009, 13:47
  5. Neat sheets
    By tnhillbilly in forum General Hammock Talk
    Replies: 5
    Last Post: 12-30-2007, 21:37

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
  •