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CHIMNEY INSPECTION DIAGNOSIS REPAIR
BACKDRAFTING HEATING EQUIPMENT
CARBON MONOXIDE - CO
CHIMNEY COMPONENT DEFINITIONS
CHIMNEY FIRE ACTION / PREVENTION
COMBUSTION GASES & PARTICLE HAZARDS
COMBUSTION PRODUCTS & IAQ
FLAME COLOR, BLUE vs YELLOW COMBUSTION
HEATING SYSTEM INSPECTION
HOME HEATING SAFETY
ODORS GASES SMELLS, DIAGNOSIS & CURE
SAFETY RECALLS CHIMNEYS VENTS HEATERS
STAIN DIAGNOSIS on BUILDING EXTERIORS
WOOD, COAL STOVES & FIREPLACES
WOOD STOVE SAFETY
Curved chimneys & sulphation: this article describes the cause, inspection, and evaluation of curved chimneys. Often a brick chimney is visibly curved or leaning above the building roof line.
If the cause is sulphation it is well understood, but further inspection of the chimney flue and the chimney stability are in order since a badly damaged brick chimney may have an unsafe flue or may collapse. Our page top photo shows a curved brick chimney above the rooftop of a home in Hudson, NY. Look closely at the left edge of the brick chimney to best see this deformation.
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These articles on chimneys and chimney safety provide detailed suggestions describing how to perform a thorough visual inspection of chimneys for safety and other defects. Chimney inspection methods and chimney repair methods are also discussed.
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Curves or bending in brick masonry chimneys are common on older homes and may not be evidence of actual chimney settlement or movement.
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A brick chimney may curve away from its most weather-exposed side due to sulphation: a term which describes expanding brick mortar joints caused by the combination of water and sulphur or other minerals.
As Carson Dunlop's sketch points out, curved chimneys seen above the roof line often are found in northern climates where:
A curved brick flue may might need repair or replacement but it's not certain. The flue interior needs to be inspected thoroughly for damage and stability.
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