Last edited by Albert Skye; 08-10-2010 at 15:02.
What exactly is your intended purpose for the expanded foam mesh?
To provide separation only? or added insulation?
The speed of execution is because I'm backpacking with a friend next week and I want to lend him a hammock. He's too tall for my hammocks, so I made a quickie Speer type, and I was just wondering what to do about bottom insulation when I saw your post. Thanks!
I tested the tear strength in both directions as Mac suggested, and he's right, it's definitely stronger in one direction. Fortunately for me that complements the slit pattern I chose - cutting the long direction of the diamond.
I think we agree that the separation layer should minimise conductive heat transfer. A separate separation layer has less thermal coupling. Mesh reduces convection.
The top and bottom pieces are flat 45" x 75" (3375 sq. in.). Of course, if I had cut the slits closer together, I could have started with a much smaller center piece, but I didn't want to cut that many slits. As it is, the "loft" may be as much as an inch, which will perhaps compress to 1/2". I'll see how that works.
What thickness of foam sheet are you thinking of expanding 1/8"?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.
1" O.D. leather punch will work. Affix it to a hammer handle and whack away.
I would think slits would just compress sideways
I just meant that individually pleated diamonds would be superior insulating separators to individually slit diamonds. The opening provided by the slit works against reducing heat transfer.
I'm sorry, Dave! Your approach is intriguing!