Seyitnizam Mah. Demirciler Sit. 2.Cad. No:25 Zeytinburnu / İstanbul / Turkey
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- Seyitnizam Mah. Demirciler Sit. 2.Cad. No:25 Zeytinburnu / İstanbul / Turkey
- +90 532 775 90 71
- [email protected]
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Causes of Water Leaks Around the Chimney Base
Technical examination of why chimney flashings leak and professional remedies to achieve long-term watertight sealing.
The intersection between the chimney stack and roof pitch is one of the most vulnerable zones on any roof. Because chimneys and timber frames expand and contract at different rates, conventional caulking quickly fails.
Primary Reasons for Chimney Leaks
Corroded or Damaged Step Flashing: Metal step flashing tucked under shingles rusts or lifts over time.
Cracked Mortar Crown or Joints: Porous brickwork absorbs rain, letting water seep downward inside interior chimney breasts.
Defective Counter-Flashing: Flashing dislodged from mortar reglets allows runoff behind the metal apron.
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