Roof Leak Diagnosis: Finding the Source (Not Just the Stain)
Water shows up feet away from its entry point. Here's how professional roofers trace a leak to its real source.
The ceiling stain almost never sits directly under the leak. Water travels along rafters, decking, and insulation before dripping — sometimes 10+ feet from entry.
Common entry points, in order of frequency
Flashing around chimneys, skylights, and wall intersections (60% of leaks).
Pipe boots — the rubber gasket cracks after 10–12 years.
Nail pops in shingles and lifted ridge caps.
Ice dams and clogged valleys.
The trace-back method
Locate the stain. Trace uphill along the rafter to the first roof penetration. Inspect flashing, boots, and nail heads within a 6-foot radius above the stain.
When to call a pro
Multiple stains, active drips in a rainstorm, or any leak near a chimney — these fail DIY fixes and grow expensive quickly.
Frequently Asked Questions
- Is a leaking roof covered by insurance?
- Only if caused by a covered peril (storm, fallen tree). Age-related and maintenance leaks are homeowner responsibility.
Storm damage on your roof?
Check live storm radar, then use our tools to document damage and estimate repair cost.