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I ordered a bunch of silnylon from a supplier online. Its 1.1ounce supersil. I made a shelter and went to set it up yesterday. The problem I'm having is that the fabric just keeps stretching! I know it stretches when it gets wet. It wasn't wet. I had to keep retightening the guy-lines so much that the corners eventually formed a "v" shape, like a catenary curve. Do you think I got poor quality fabric?
No, I think that is just the way silnylon is. As it gets colder, it stretches. At least, that's been my experience.
Yes. A first quality silnylon isn't that bad. Try the material from Thru-Hiker, or Quest Outfitters (firsts).
Also try cutting the fabric pieces to put the most stress, for example along the ridge line, parallel with the grain of the weave, and not diagonal, or on a bias or slant, to the grain.
If you bought Rockywoods "Ultrasil," and cut the ridge line diagonal to the grain, it would perform as you describe. It also is quite porous-read leaky.
I believe coated nylon and to a lesser extent silnylon stretch with decreasing temperature and increasing humidity.
Polyester is much more dimensionally stable if it matters to you. On the downside it is less capable of absorbing wind gusts which may necessitate the use of bungee at guy points.
All other things being equal polyester is also reportedly much more UV resistant.
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