Roof Flashing Inspection Checklist: The 6 Spots That Leak First
Flashing causes 90% of roof leaks — not shingles. The six critical flashing spots to inspect annually and the signs of failure.
When a roof leaks, shingles get blamed. But 90% of leaks originate at flashing — the metal that seals transitions and penetrations. Shingles outlast flashing by a decade.
The six critical inspection points
1. Chimney flashing — step + counter-flashing. Rusted or caulked-only is a red flag.
2. Pipe boots (plumbing vents) — cracked rubber collars leak in year 7–10.
3. Skylight flashing — head, sill, and step. Rusted screws or lifted step-flashing = imminent leak.
4. Roof-to-wall step flashing — must be woven with shingles, not surface-caulked.
5. Valleys — either metal (W-valley) or woven shingle. Debris or rust = leak path.
6. Drip edge — required by code on eaves and rakes. Missing drip edge rots fascia.
The single most-missed item
Pipe boots. A $25 replacement at year 8 prevents a $2,500 ceiling repair at year 10. Any homeowner can spot a cracked collar from a ladder.
Frequently Asked Questions
- Can I re-caulk failing flashing instead of replacing it?
- Short-term only (1–2 years). Caulk is a symptom, not a fix. Plan the real repair before the next storm.
- Should flashing be reused during a re-roof?
- No. Reputable roofers replace all flashing during a tear-off. If the bid says 'reuse existing flashing,' get another bid.
Add years to your roof — before you spend a dollar on replacement
Estimate how much life you have left, price small repairs, and see whether prevention beats replacement in your situation.