[lederhos]

I’ve had good luck with 1” VHB tape between a 2’ piece of 1 1/4” angle aluminum on each side of 100 watt panels. When I went to remove them after 10 years, I had one heck of a time (fishing line will be used if I ever have to repeat). If I decide to go back to ridged panels I will use the same method even if much larger panels. I might use longer channel and will silicon around it not for sealing but to keep UV from degrading the VHB tape from the sides. If I was REALLY concerned I MIGHT pin each end of the channel with one sizable pop rivet through the top “skin” only and with appropriate sealant, just to prevent a possible lift from starting at the ends. I would avoid using fasteners that “sandwich” the roof.