People start on this roof an a few other roofs every time the informal is at this map. This is because the rules do not state you are not allowed to do this.
ER. 1.18 --- It is forbidden to use places that cannot be accessed by foot or ladder when event already started and it is not allowed to use highground such as highways which are not accessible from inside the event once it has started. | Jail 120 min
As shown in the video below the roof is accessible by foot when the event has already started. You simply go into the circle then you climb up as shown in the video and that his how you access the roof when the event is already started. No where in the rules does it say the roof top has to be accessible with out stepping foot into the circle after the event has started. Families start right there every single time.. I have even seen your family start from this roof top since it is in fact accessible when the event already started. I have also seen people from other families put an armor on and run though the zone to climb up so they can start on edge of the roof after the event circle has started. Not sure why you chose our family to target with this post. It seems awfully devious.. but anyhow.. thanks for reading my reply.. have a wonderful day.