Hi! This was posted over on APN by Tom B so I'm sharing here since company's based in Canada. I can't personally vouch for them since never used, but fyi in case it helps. 🙂 itsa

per Tom B... This web site has a TON of ideas on how to build a greenhouse for all climates and budgets . Their catalog (download or mail for a hard copy) is painfully short on sales push (YAY) and overwhelmingly informative . The fella is a CA transplant now in Canada (burr) and sells a plastic that I would bet my life on . It's about .011 thick and seems to have fish line or something running through it . It's tough as nails . The catalogue has more info than the average person can digest in one sitting . Give it a look. http://www.northerngreenhouse.com/index.htm