A leaky chimney can cause serious problems, from water stains to structural damage. Understanding the root causes of chimney leaks can help you take action before the issue worsens. If a chimney is leaking, there is going to be more hidden damage under the damage you can see. A chimney leaking can quickly become your worst nightmare!
chimney chimney cap chimney inspection chimney leak chimney repair chimney sweep chimney swift creosote fire fireplace flashing full coverage cap insert leak nfpa 211 top down tutorial wood wood stove
Common Causes of Chimney Leaks
1. Damaged Chimney Cap
- A missing or broken chimney cap allows rain and snow to enter the flue.
- Solution: Install a properly fitted chimney cap to keep moisture out.
2. Cracked Chimney Crown
- The chimney crown protects the top of the chimney. Cracks allow water to seep in, leading to brick deterioration.
- Solution: Repair minor cracks with a waterproof sealant or replace the crown if severely damaged.
3. Deteriorating Mortar Joints
- Over time, mortar joints break down due to weather exposure, allowing water to penetrate the chimney structure.
- Solution: Repoint the mortar joints (tuckpointing) to restore the chimney’s integrity.
4. Faulty Flashing
- Flashing seals the gap between the chimney and roof. If it’s loose or damaged, water can leak into your home.
- Solution: Replace or reseal flashing with high-quality waterproof materials.
5. Porous or Spalling Brick
- Older chimneys may absorb water, causing bricks to crack or flake (spalling).
- Solution: Apply a breathable, water-repellent sealant to protect the brickwork.
What should you do if your chimney is leaking?
Regular chimney inspections and maintenance can help prevent costly water damage. If you’re dealing with a persistent leak, it’s best to call a professional chimney technician for a thorough assessment.
