Roof Leaking Around Chimney
Address within 1–2 weeks to prevent further damage
Chimney leak? Learn the causes, DIY diagnosis steps, repair costs ($300–$1,500), and when a full roof replacement is needed instead of patching. Estimated repair cost: $300–$1,500. For a precise estimate based on your actual roof, get a free satellite quote at RoofVista.
Likely Causes
Deteriorated chimney flashing — the metal seal between chimney and roof cracks or pulls away over time
Cracked chimney crown — the concrete cap on top allows water to seep behind flashing
Missing or damaged chimney cricket — without this diverter, water pools behind the chimney
Failed mortar joints in chimney masonry let water penetrate into the roof structure
Improper original flashing installation — step and counter flashing not correctly layered
How to Diagnose This Problem
- 1
Inspect the chimney flashing from ground level with binoculars — look for gaps, rust, or lifted metal
- 2
Check attic space around chimney penetration for water stains, mold, or daylight
- 3
During rain, observe where water appears first — this narrows the entry point
- 4
Look at the chimney crown for visible cracks (inspect from a safe position, not the roof)
- 5
Check if a chimney cricket exists on the uphill side — homes built before 1990 often lack one
Estimated Repair Cost
$300 – $1,500
Typical repair range (varies by location and severity)
When to Replace Instead of Repair
If flashing replacement reveals rotted decking beneath, or if the roof is 20+ years old with multiple leak points, a full replacement is more cost-effective than repeated flashing repairs.
Materials Affected
Not Sure If You Need Repair or Replacement?
Get a free instant estimate based on satellite measurements of your actual roof.
Get Free Instant Estimate →