If your home has a chimney and you're seeing a roof leak, start your search at the chimney. Chimneys are a common failure point on Northeast Ohio roofs.
Here's why chimneys leak so reliably, what specifically fails, and how to figure out if you need a roofer or a mason.
Why Chimneys Leak More Than Anything Else on a Roof
Chimneys leak for three structural reasons:
- The chimney protrudes through the roof. Every penetration through a roof is a potential leak point. The chimney is the largest, most complex penetration on most homes. It needs flashing on four sides, two transition geometries (vertical brick to angled roof), and counter-flashing embedded in a brick mortar joint.
- Different materials expand at different rates. The chimney brick expands and contracts with temperature differently than the asphalt shingles around it. Over thousands of freeze-thaw cycles, that differential opens gaps at the flashing seams.
- Standing water and snow. Snow piles up on the upslope side of the chimney. A "cricket", a small peaked structure that diverts water around the chimney, is required by code on chimneys wider than 30 inches but is missing on many older homes.
The Five Chimney Leak Sources, Ranked
Chimney leaks usually start at one of five points:
- Failed step flashing. Step flashing is the set of L-shaped pieces that interleave with the shingles along the sides of the chimney. They pull away from the brick over time, caulk dries out, fasteners corrode, ice expands the gap. Water enters at the brick-to-flashing seam and runs down inside the roof.
- Failed counter-flashing. Counter-flashing is the metal embedded in a mortar joint of the chimney brick. When the joint cracks (freeze-thaw) or the flashing rusts, water enters here and travels down behind the step flashing.
- Cracked or missing chimney crown. The crown is the concrete or mortar cap on top of the chimney. When it cracks, rain falls directly into the chimney flue, runs down the brick, and emerges at the roof line.
- Cracked brick or failed mortar joints. Especially common on chimneys 50+ years old. Water absorbs into the brick, freezes, expands, and breaks the brick face. Over time, water finds a path through.
- Missing cricket on a wide chimney. Code-required on chimneys wider than 30 inches but missing on many older Ohio homes. Snow accumulates on the upslope side, melts during the day, refreezes at night, and forces water under the shingles.
Do You Need a Roofer or a Mason for a Chimney Leak?
Work in this order:
Call a roofer first. Most chimney leaks are roof-related, not chimney-related. Step flashing, counter-flashing, and cricket installation are all roofer's work. A roofer can also tell you whether you need masonry work.
Call a mason if the roofer identifies cracked brick, failed mortar joints, or a damaged crown. The mason rebuilds the masonry, and then the roofer reinstalls the flashing.
Call both for big jobs. A 50-year-old chimney with failed flashing, cracked brick, and a damaged crown needs both trades. We coordinate this work and bring in our preferred mason when needed.
We do all the flashing work and the cricket installation. We don't do brick repair or crown replacement. Those are specialty masonry skills that take a dedicated career to do well.
How Do You Find Where a Chimney Is Leaking?
Most homeowners assume the leak is wherever the water is dripping inside. That's almost never true. Water enters at one point on the roof, runs along framing or sheathing, and exits at the lowest point that allows it to drop. The actual entry can be 10+ feet away from the visible drip.
The reliable way to find the entry point is a water test:
- On a dry day, run a hose at the chimney from below and slowly upward
- Have someone inside the attic with a flashlight, watching the chimney area
- Note exactly where water first appears inside
- Move the hose progressively higher up the chimney until the leak appears
This identifies whether the leak is at the base flashing, the side flashing, the counter-flashing, or higher up at the crown. A 10-minute water test saves hours of guesswork.
What Does Chimney Leak Repair Cost?
In Northeast Ohio:
- Re-caulking deteriorated flashing seams (cosmetic): $200–$500 (buys 1–3 more years)
- Replacing step flashing on one side of chimney: $400–$900
- Full re-flashing (step + counter-flashing on all four sides): $800–$2,000
- Adding a cricket to a wide chimney: $600–$1,500
- Crown rebuild (mason): $400–$1,200
- Full chimney re-build (mason): $3,000–$15,000+
We generally recommend full re-flashing on chimneys that have been leaking, rather than spot-repairing. The cost difference between fixing one side and re-flashing all four is small, and once one side fails, the other three are usually within 2–3 years of failing.
When Re-Flashing Happens During a Roof Replacement
If you're replacing the whole roof with Rockstar Roofing LLC, based in Ashtabula, Ohio, full chimney re-flashing is part of our standard scope. New step flashing, new counter-flashing if accessible, sealants at brick joints, and a cricket on chimneys over 30 inches wide. During a replacement, that work adds maybe 1–2 hours per chimney. Coming back later to do it costs far more.
Signs Your Chimney Is About to Leak (Before It Does)
Watch for:
- Visible rust on metal flashing
- Cracked or missing caulk where flashing meets brick
- White efflorescence (salt deposits) on the brick, a sign the brick is absorbing moisture
- Spalling brick (pieces flaking off the face)
- Cracked mortar joints
- Damp patches on attic framing near the chimney, even if no interior staining yet
- Water staining on the wall directly below an interior chimney
A chimney inspection from us takes 30 minutes and identifies whether you have a few months or a few years before the next leak.
Inspections and Free Estimates
Call (440) 645-2003 or request a free estimate. We document with photos, identify the failure mode, and give you a written estimate for repair or full re-flashing. If you need masonry work, we tell you and refer you to a mason we trust.
Frequently Asked Questions
Do I need a roofer or a mason for a chimney leak?
Call a roofer first. Most chimney leaks come from step flashing, counter-flashing or a missing cricket, and all of that is roofer's work. If the roofer finds cracked brick, failed mortar joints or a damaged crown, a mason rebuilds the masonry and the roofer then reinstalls the flashing.
How much does it cost to re-flash a chimney in Northeast Ohio?
Full re-flashing, step and counter-flashing on all four sides, runs $800–$2,000. Replacing step flashing on one side runs $400–$900. Re-caulking the seams costs $200–$500 and buys only 1–3 more years.
What is a chimney cricket and do I need one?
A cricket is a small peaked structure on the upslope side that diverts water around the chimney. Code requires one on chimneys wider than 30 inches, but many older Ohio homes don't have one. Adding a cricket runs $600–$1,500.
How do you find exactly where a chimney leak starts?
Use a water test on a dry day. One person runs a hose at the chimney from below and moves it slowly upward while another person watches the chimney area from the attic. The point where water first appears inside shows whether the leak is at the base flashing, side flashing, counter-flashing or crown.
How long does chimney flashing last in Ohio?
Chimney flashing typically fails at the 15–20 year mark. Caulk dries out, step flashing pulls away from the brick, and counter-flashing rusts. Ohio's freeze-thaw cycles speed up each of those failures.
What are the warning signs before a chimney leaks?
Look for rust on the flashing, cracked or missing caulk where flashing meets brick, white salt deposits or flaking on the brick, and cracked mortar joints. Inside, check for damp patches on attic framing near the chimney.
About the Author
Mike Ende, Founder, Rockstar Roofing LLC
Mike Ende has 9+ years of Northeast Ohio roofing experience and founded Rockstar Roofing LLC in 2024. He is an Owens Corning Duration installer, BBB A-rated, fully insured, and personally answers the phone at (440) 645-2003. Based in Ashtabula, OH, Mike serves homeowners across Ashtabula, Lake, Geauga, Cuyahoga, Summit, Mahoning, and Stark counties.
Read Mike’s full story →This article was last reviewed and updated on November 7, 2026.