I fastened the roof to the top rail frame under the curved side cap. I used a 4" wide seam of 221 caulk, hex rubber sealed self drilling screws, and covered the top of the screws with sealant. The roof has been subjected to heavy rain and snow with no leaks to date (3 years). I did look at rolling the roof over the side however the attachment points on the side frame were spaced every 24".
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