Step 7: Installing the greenhouse roof
There are other roof materials but I have been very impressed with how easy Polygal is to work with and how well it functions. During kiln operation, you can feel the heat come through the insulated walls while the roof is cool to the touch. It also seems very durable as it got whacked by a significant hail storm this spring with quarter-sized hail with no apparent damage.
I also put self-adhesive weather stripping between the frame and roof to reduce air leaks although the stripping did make it a little more difficult to slide the roofing panels into the brackets. I beveled the edges very slightly with a utility knife and the panels slid into the brackets a little easier.