It says no two meter rule, and then says rooftops are OB. Can you clarify, if someone lands on the ground under a roof, are they OB?
OB zones extend vertically, so if the answer to the above question is no, it should be restated that rooftops are not OB, rather the two meter rule is in effect only for rooftops. If the answer is yes, then it may be useful to clarify to players that an OB roof means the ground under it is OB as well?
If you land on top of the roof you are OB. You are not allowed to play a lie on top of house, building, or a lift house. Those buildings are OB. Treat them like an island.