I'm fitting a solar panel shortly and need to know if I can put any weight (me - 65kgs) on the roof so I can clean up the Sikaflex from the panel mounting plates. It would also help with cleaning the roof. I just can't seem to reach the middle bit from a ladder. I have no idea how thick the roof is or how it is constructed. It does seem to have a non slip finish to it as if it was designed for someone to stand on. Tha tmay of course be a false assumtion.