Why roof leaks happen (and why they get worse fast)
A roof leak is rarely “just a small drip.” Water can travel along decking and rafters, showing up far from the real entry point. That’s why professional leak diagnosis matters.
9 common causes of roof leaks
Flashing failure around chimneys
Skylight flashing or seal issues
Vent boot cracks
Missing or damaged shingles
Nail pops and exposed fasteners
Valley wear where water concentrates
Tile roof underlayment failure
Flat roof seam separation (TPO and similar systems)
Clogged gutters causing water backup
How pros repair roof leaks
Targeted removal of damaged materials
Replacement of flashing/boots/sealants where appropriate
Correct re-installation with proper overlap and water shedding
For flat roofs: seam repair, membrane patching, or section replacement
What to do during an emergency leak
Contain water and protect valuables
Avoid climbing on a wet roof
Call for emergency leak repair
Schedule roof leak repair in San Fransisco and the Bay Area
Roof by Tom provides roof leak repair in San Fransisco, San Jose, Oakland, and Daly City.
Book a free consultation: (925) 722-6494
FAQ
Can you find the exact source of the leak?Yes—most leaks can be traced to flashing, penetrations, valleys, or membrane seams.