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How do you repair chimney?

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Anonymous

13y ago
Updated: 9/22/2025

Repairing a chimney involves several steps, depending on the type and extent of damage. Here's a general guide on how to repair a chimney:

  • Inspect & Diagnose: Check for cracks, damaged bricks, deteriorated mortar, leaking flashing, cracked crown, damaged cap or liner.
  • Clean Up: Remove debris, old mortar, loose brick pieces and creosote. Sprinkle some water to dampen surfaces so new materials adhere well.
  • Repair Mortar / Repointing: Remove damaged mortar joints (“repoint”), mix new mortar and apply it in place.
  • Replace Bricks & Cap / Crown: Replace cracked or crumbling bricks. Fix or replace chimney cap or crown if they’re damaged, so water can’t enter.
  • Repair Flashing & Seal Leaks: Check metal flashing between chimney & roof. Fix gaps, seal flashing well to prevent leaks.
  • Ensure Flue / Liner is Safe: If flue liner is cracked or damaged, replace or repair to ensure safe ventilation. Clean away any blockages.
  • Waterproofing & Finishing: Apply sealants or waterproof coatings to protect exposed surfaces. Inspect again to make sure repairs are properly done.

If you notice severe structural damage, or if the chimney requires relining or complex repairs, it's best to call a certified chimney specialist or contractor. ALC Chimney Service is one such expert you can trust.

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