I'm about to do an upgrade on my hoophouse.
I have been noodling on making laminated plywood bows with Gorilla Glue.
With wooden bows at both ends and the middle, I can
1) use a separate piece of plastic for the ends, rather than one large sheet
2) frame in vent windows.
I'm thinking of using that same laminated bow technique to make window vent frames that match the curvature of the PVC bows.
First I'll make large vent windows and hinge them to open up like gull wings on the lower sides. Then I can get to the other side of the plants and weed and plant from the outside.
Later I'd like to add an upper pair of gull wing windows so that open, the outside air flows straight through the hoophouse without restriction.
The final goody would be framing the windows with two layers of plastic, inside and outside for better insulation.
But I don't want to lose the sunlight I have. The year-old plastic I have is sort of milky already. Two layers of that would be too dark.
So, is there a grade of greenhouse plastic that's really clear ? I could buy 12 mil clear vinyl but it's somewhat expensive and I'd have to sew together over a dozen yards of it.