Nangrasby

Provided you can see flashing from a floor and it's pulling on the other roof materials, most time to inspect the roof.

If you are working on the sloped asphalt shingle roofs then customs make note of how insects layers are placed.

Although stagnant puddles do not generally generate mold, the water might ultimately seep into the surface, helping mold to grow.
The most essential thing you can do, no matter how little or how enormous the water damage, is to react instantly.