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    iwanna's Avatar
    iwanna Posts: 9, Reputation: 1
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    #1

    Oct 16, 2013, 02:36 PM
    Will two layers of 4mil plastic sheeting keep my greenhouse warmer?
    What is the most economical material to cover a hoop greenhouse? Would 2 layers of 4 mill plastic sheeting ehlop more than one?
    joypulv's Avatar
    joypulv Posts: 21,591, Reputation: 2941
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    #2

    Oct 16, 2013, 03:04 PM
    An air space between the two, yes, otherwise all it would do is help a little if something made a hole in the other one.
    Air is actually a pretty good insulator. If you could figure out some way to make an inch in between, that would save some of the sun's heat - for a while. Not at night, if you are in the north. I'm not sure it's worth it, because you want the sun to get through, and the plastic is a bit cloudy and will cloud up more.

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