If you haven't got a pole to balance yourself on a roof top why not use a chainsaw

Jane Durney spotted this backwoodsman throwing caution to the wind in South London. "After the recent storms, I spotted this guy wielding a chainsaw sliding all over the place on a roof behind a pub in Carshalton near Sutton." Jane doesn't say whether he'd also had a drink in the pub, possibly needed to calm the nerves.

chainsaw roof blunder