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Reviewed by Tom Reilly — Senior Editorial Reviewer — Roofing, Carpentry & General Contracting

Who to call · Roofer

Leaking roof vent or flashing: call a roofer — or fix it yourself

Leaks around roof vents, pipes, or flashing are one of the most common causes of roof leaks. Flashing — the thin metal strips that seal transitions between the roof and chimneys, vents, or walls — deteriorates over time from UV exposure, thermal cycling, and storms. Even a small gap lets water infiltrate into the attic and down through ceilings. A roofer can remove the old flashing, install new step or counter flashing, reseal vent boots, and verify there's no hidden water damage in the decking below.

Is this your problem?

Symptoms to look for

  1. 01

    Water stains on ceiling directly below a roof vent or chimney

  2. 02

    Dripping in the attic around pipe or vent penetrations after rain

  3. 03

    Cracked, rusted, or lifted flashing visible from the ground

  4. 04

    Damp or rotting wood around vent boots in the attic

  5. 05

    Daylight visible through gaps around roof penetrations from inside the attic

Who to call

Roofer

A roofer replaces the boot or the flashing, checks the neighbouring seals while up there, and replaces any rotted decking around the penetration.

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Fix it yourself

How to fix leaking roof vent or flashing

Leaking roof vent or flashing

hard 30–90 min

Tools: flashlight, binoculars, caulking gun, putty knife · Materials: roofing sealant, replacement rubber vent boot

Steps

  1. Confirm the source from the attic: a leaking vent stains the deck around the pipe; a leaking chimney stains along its uphill side.
  2. From the ground, check the rubber boot on plumbing vents — they crack after 10–15 years and are the most common roof leak.
  3. On a single-storey, low-pitch roof you can reach safely, clean around the boot and seal a small crack with roofing sealant as a stop-gap; a split boot needs replacing.
  4. Photograph the vent and the stain for the roofer if you are not going up.

Stop and call a pro if

  • the roof is above one storey, steep, wet, or icy — do not go up
  • the leak is at a chimney, skylight or valley — flashing work
  • the deck around the vent is soft

What a pro does that you can't

A roofer replaces the boot or the flashing, checks the neighbouring seals while up there, and replaces any rotted decking around the penetration.

DIY cost: $10–25 for sealant or a boot, only for a safely reachable roof

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FAQ

Frequently asked questions

Who should I call for: Leaking roof vent or flashing?

Call a licensed roofer. Roofers have the specialized training, tools, and insurance to diagnose leaking roof vent or flashing safely and stand behind the fix. Most offer free quotes and can visit the same day or the next.

Can I fix this myself?

Often, yes: the guide above has 4 steps (hard, 30–90 min, $10–25 for sealant or a boot, only for a safely reachable roof). Stop and call a roofer if the roof is above one storey, steep, wet, or icy — do not go up.

How fast can a pro come out?

Most roofers offer same-day or next-day visits for non-emergency issues. True emergencies (burst pipes, gas smell, no heat in winter) are typically handled within 1–4 hours.

How much does it cost to fix?

Costs vary by severity and your location. Submit a free quote request to get real pricing from local pros in your area.

What are the signs of: Leaking roof vent or flashing?

Water stains on ceiling directly below a roof vent or chimney. Dripping in the attic around pipe or vent penetrations after rain. Cracked, rusted, or lifted flashing visible from the ground. Damp or rotting wood around vent boots in the attic. Daylight visible through gaps around roof penetrations from inside the attic.

Who to call

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