You know the roof is bad if shingles are missing or obviously damaged or when water stains the ceiling or walls.
Sources of roof leaks.
Roof vent pipes are common areas for roof leaks.
So if you encounter a patch of mold which thrives on moisture chances are you ve found the vulnerable point in your roof.
No matter how well your skylights were installed it is still possible for them to leak during heavy rains.
During installation each skylight essentially creates a big hole in an otherwise uniform roof surface.
Mold on the other hand has a tendency to linger.
Especially as your home ages a bit.
Once you have determined that the leak is caused by a roof related issue measure the location of the leak in the living space from two fixed points.
The goal is to find the leak before the entire roof goes bad.
Skylight leaks in heavy rain are a common source for roof leaks.
Roof vent pipes from plumbing or exhaust vents penetrate the roof and are usually sealed using a collar style flashing made out of a flexible material like epdm rubber or flexible pvc.
Finding the actual spot where the roof leaks is difficult because water can enter the roof in one place and run down to another before it starts soaking into the ceiling.
Other sources of potential leaks in the home include plumbing roof scuppers roof drains hvac and condensation.