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Cole_Robbie · October 31, 2017

I started with an inflated double layer when I first got the greenhouse, which will be seven years ago in the spring. I had to take a layer off, because I used diluted latex paint as shade paint, but then couldn't get it off. I do still have a spare piece of plastic from my high tunnel, so I could throw it on the greenhouse if I wanted to.

I never saw any difference in strength of the structure with the double layer, as it is an expensive Clearspan brand building, and quite sturdy. I believe the Amish have a design for an inflated double layer that uses the wind, and a swiveling wind vane cone to catch it. That design does add strength, because the inflation pressure is greatest during wind gusts, which is when that strength is most needed.

October 31, 2017	#57
Cole_Robbie Tomatovillian™ Join Date: Jun 2012 Location: Illinois, zone 6 Posts: 8,407	I started with an inflated double layer when I first got the greenhouse, which will be seven years ago in the spring. I had to take a layer off, because I used diluted latex paint as shade paint, but then couldn't get it off. I do still have a spare piece of plastic from my high tunnel, so I could throw it on the greenhouse if I wanted to. I never saw any difference in strength of the structure with the double layer, as it is an expensive Clearspan brand building, and quite sturdy. I believe the Amish have a design for an inflated double layer that uses the wind, and a swiveling wind vane cone to catch it. That design does add strength, because the inflation pressure is greatest during wind gusts, which is when that strength is most needed.