Just three days ago, we worked a house fire that appeared to have originated from HVAC wiring in the attic. Flat roof with about 16" of space between the interior ceiling and roof. The fire was still small, but making a run in the attic space. We HAD to pull lots of ceiling and cut the roof to gain access and spray water on the fire. Yes, the fire was small and isolated to the attic, but if we didn't do what we did, the entire house would've burned down. Guaranteed 100%.