Been to a few close calls with improperly installed flues from stoves, one being a minute or two from being through the roof. The sarking boards as we call them we're actually tight against the flue!3rd major roof fire this winter last night.
Heat transfer from from woodburner flue. Again
Timber framed construction with lots of voids allowing rapid fire spread. Again
Supposedly fire retardant paper insulation which isn't. Again
There's a pattern developing here.
Occupants tried to fight it for half an hour before calling us. But it came in as a chimney fire so only 1 pump (us) initial attendance. I made up on arrival but next nearest pump was 15 minutes away.
Ended up with 5 pumps and an ALP there.