I bought about 10 rolls of white-back aluminum that was not cheep then (7 yrs ago) tough as nails as long as you take care of it. You want the quality of stuff suitable radiant-floor heating. When we are away for the winter I cover all our windows here in Montana with the stuff. I also used it for the "nail up" radiant heating. Works great. Look on the internet for the stuff in radiant floor heating supplies. I think mine came in at 48"X20'.
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