I am in the process of fitting my extension roof. Its a half gable affair (lean too) 22 degrees. There is a run out of about 35mm over a 6m length between the house wall and the extension wall measured horizontally. I have started to put my roof joists up (6x2) bird mouth on the wall plates etc. My question is that this runout will affect the tile laying to some extent. Should I A) Take up the runout by spacing the tile battens wonkily, like a fan effect. I'll be fitting about 6 battens. This may affect the lay of the tiles on each other. b) Keep the battens parallel to the facia/gutter and have the runout at the house wall which will be desguised by the lead flashing. c) use a much better method that I don't know about but soon will Your advice will be welcome. While I'm here somebody mentioned on a earlier post that the cloaking is nailed to the barge board. Surely it is nailed to the underside of the tile batten, allowing the barge board to be changed once its rotted.