Roofing · Common problems · Updated November 2026
Damaged Roof Flashing: Signs and Repair Options
Flashing is the metal (or sometimes rubber) that seals the joints where the roof meets a chimney, wall, skylight, vent or valley. These joints are among the most common places for roof leaks.
Do not climb on the roof to inspect flashing. Use binoculars from the ground or let a roofer inspect it.
Signs of a flashing problem
- Ceiling or wall stains near a chimney, skylight or where a roof meets a wall.
- Rust, bent or lifted metal visible from the ground.
- Heavy caulk or roofing tar smeared over flashing (often a sign of past patching).
- Missing mortar where flashing tucks into a chimney.
- Cracked rubber boots around plumbing vent pipes.
Repair options
- Reseal or replace a vent boot: a small repair.
- Replace step flashing at a wall or chimney: shingles nearby are removed and reinstalled.
- Chimney counter-flashing: may need mortar work at the chimney.
- Replace all flashing during a re-roof: ask whether quotes include new flashing or reuse the old (what an estimate should include).
Caulk alone is a short-term fix for flashing. Ask what the repair includes.
When to call a pro
Call when you see stains near roof penetrations or visible flashing damage. A roofer can inspect from the roof and attic and tell you whether a repair will last.
Cost figures are national ranges from the sources listed in our roofing cost guide, not a quote from FixFinch or any contractor. This article is general information to help you decide on next steps. It is not an inspection or professional advice; a qualified pro who sees the problem in person can tell you what is actually going on. Calls connect you with an independent service provider in our network. FixFinch is not a contractor and does not perform the work.