Question about solar panel screwing on rv roof

[NCmountainsOffgrid]

A typical rv roof is only ribbed every 12 inches or so, so no, you probably won't be hitting anything substantial for every hole for solar panel mounting, though as long as the screw goes into the roof you'll probably be fine.

[wanderer]

Hi everyone! i'm trying to install 2 Renogy solar panels on my rv roof and i used the screws and brackets that came with the panels. When i screw the panel to the roof, the screws didn't tight on the roof, not in every hole of the brackets. My doubt here is: Is it normal? Or if i need to do someting, what would it be?
i'll apreciate any advices or comments. Thanks