Which adhesive caulk for solar panel mounts??
My CW has Sikaflex in 221, 505 and 715. Which one is best to mount solar mounts to thin fiberglass roof along with screws?
Forum Discussion
Without screws, gluing it to rubber-ish membranes - including TPO sheets - won't be smart. Even If it adheres well, you don't want it to fly off with pieces of membrane still attached. I vaguely recall some TPO membranes with plywood backing and aluminum joists underneath - not wooden joists. You better find out what you have there, before driving the screws in. Without anchoring it to joists, you need more screws per each bracket, to hold in 3/4" particle board.
