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I chose a rigid panel because they seem to last longer, run cooler and have an air space under them. I saw a post on another forum where the heat from a flexible panel had discolored the roof under it. Don’t know that it actually caused damage but figured that minimizing the heat load on my RV was a good thing. Also have a small concern that while panels certainly can be glued to the roof, the TPO itself is not bonded and a glued raised rigid panel could lift it. I have no reluctance drilling into my roof. I pre drill my screw holes, fill them with dicor, apply a puddle of dicor for the mounting foot and then dicor over the whole foot. I was able to drill into my aluminum rafters for all screws. There are, literally hundreds of holes in my roof anyway and a few more don’t worry me. But that’s just me. In any case my 80W Renogy panel is one of the best mods I’ve done. It keeps my coach and chassis batteries full charged while in storage. 100% solution to a long standing problem I’ve had.
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