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Roof Leak Diagnosis

A roof leak rarely starts where the stain appears. The timing, location, and weather conditions at the time of leaking tell you more about the source than the water mark itself. Here's how to read each pattern.

📄 6 guides👤 T.A. — Certified Facility Manager & NFPA CFI-1
Exterior Repairs Interior Repairs Repair Diagnostics Roof Leaks Home Maintenance

The Complete Guide to Roof Leak Diagnosis & Repair

A roof leak rarely starts where the stain appears. Learn the timing, location, and behavior filters that point to the actual source.

Read the Master Guide →

Roof Leak Guides

The conditions under which a roof leaks tell you where to look. Start with the guide that matches when and how your leak appears.

🔴 Urgent
Why Your Roof Leaks Only During Heavy Rain
A roof that only leaks in heavy rain has a volume-threshold problem — water is overwhelming a flashing, seam, or penetration that handles normal rain just fine.
🔴 Urgent
Why Your Roof Is Leaking Around Flashing
Flashing failures are the most common cause of roof leaks. Lifted, corroded, or poorly sealed step flashing, chimney flashing, and valley flashing all fail predictably.
🔴 Urgent
Why Ice Dams Cause Roof Leaks
Ice dams form when heat escapes through the roof deck and melts snow that refreezes at the eave. The pooled meltwater backs up under shingles — here's how to stop both.
🔴 Urgent
Why Your Roof Is Leaking Around a Vent Pipe
Vent pipe boots crack, shrink, and separate from the pipe over time. This is one of the most common and most overlooked roof leak sources — and one of the easiest to fix.
⚠ Wind Exposure
Why Your Roof Leaks in Wind-Driven Rain
Leaks that only appear in wind-driven rain often enter through the rake edge, ridge cap, or sidewall — not through the field of the roof where you'd expect the problem.
Diagnostic
How to Tell if a Roof Leak Is Actually Attic Condensation
Condensation in an under-ventilated attic mimics a roof leak almost exactly. Before you replace shingles, confirm the water is coming from outside — not from inside.
T.A.
T.A. — Certified Facility Manager & NFPA CFI-1CHFM · CLSS-HC · OSHA 30. Experienced in building envelope management, roof systems, and moisture intrusion. All roof leak guidance written and reviewed by T.A.