Jay Angler wrote:I've seen pictures of thick straw covers on Chinese greenhouses, but I got the impression that they didn't roll them up every morning - it was an infuriatingly vague reference.
That said, #2 Son explained to me that due to the way heat moves through glass, if I wanted to insulate a small greenhouse, I would be much better to have insulation on the *inside* to stop the heat from getting through the glass. The danger of this would be the humidity freezing on the glass and then melting the next day which could result in water where one doesn't want it. So much depends on climate - when we lived in Ottawa, this would be a serious issue, but here on the Wet Coast, I can probably design things so the water drained to a suitable location. My sister has some outside metal roller blinds that she puts up and down with the turn of a handle. She can use them to stop sun in the summer as well, and she feels that even though they are by no means perfect, they were worth the cost.