I was hired to find a leak that several roofing companies could not find.
It originated where a flat roof over a breezeway joined a brick wall
on the second story. When the gutters backed up, the water would
build up on the flat roof and run down behind the bricks and show up
on the bottom floor (not the second story unit). The leak occurred at
various locations and at different times all over the apartment complex.
Some days it would leak at one place and on other days it would leak
in another place.
The mystery was that it always showed up on the bottom floor and
no one could figure out why it happened in some many places, but never
in a predictable pattern.
The back up in the gutter system was the trigger and that happened
in changing degrees, depending on how the tree droppings went
into the gutters.
When people would go up on the flat roof (after the rain was over),
they could never see the “water build up” issue because the water had
already drained off.
I’m not going to tell you how I fixed it.