We decided to insulate the ceiling of the greenhouse so it would retain the heat from the solar gain created during the day. We received the 19 R/ 5" fiberglass insulation for free from a building that was being torn down.
The rafters are 2 feet apart on center (meaning that it is 2 feet from the center of one 2X6 to the next 2X6 center) so the insulation should have just fit, but they kept falling. We put up nylon rope with roofing nails across the rafters to hold the insulation untill we could put up the plastic to hold it in place.
We found it easier to cut the plastic in short pieces , then we stapled them to the rafters.
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