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CHIMNEY INSPECTION DIAGNOSIS REPAIR
BACKDRAFTING HEATING EQUIPMENT
CARBON MONOXIDE - CO
CHIMNEY CAP & CROWN
CHIMNEY CLEANING PROCEDURES
CHIMNEY COMPONENT DEFINITIONS
CHIMNEY CRACK DETECTION & DIAGNOSIS
CHIMNEY DRAFT & PERFORMANCE
CHIMNEY FIRE ACTION / PREVENTION
CHIMNEY HEIGHT & CLEARANCE CODE
CHIMNEY INSPECTION, FLUE INTERIOR
CHIMNEY LEANING, SEPARATION, MOVEMENT
CHIMNEY REPAIR METHODS
CHIMNEY STAINS & LEAKS
CHIMNEY TYPES & MATERIALS
DIRECT VENTS / SIDE WALL VENTS
DRAFT REGULATOR, DAMPER, BOOSTER
FIRE CLEARANCES INDOORS
FIREPLACES & HEARTHS
FLUE VENT CONNECTORS
MASONRY CHIMNEY GUIDE
METAL CHIMNEYS & FLUES
SAFETY RECALLS CHIMNEYS VENTS HEATERS
SOOT AT CHIMNEY TOP
STAIN DIAGNOSIS on BUILDING EXTERIORS
WOOD, COAL STOVES & FIREPLACES
This article describes a collapsing brick chimney and gives simple advice for immediate life-safety measures to be taken in the building. Readers should also see CHIMNEY COLLAPSE Risks, Repairs.
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Watch out: Chimneys with splitting or movement such as that shown in our photographs below should not be patched, repaired, or re-lined. Nor can this chimney be used safely, not even for a moment. The chimney structure, material, and probably its footings are or were inadequate and unsafe. A chimney tear-down and replacement are in order. In some cases by converting a heating system to a direct-vent flue it may be possible to cut the costs of this repair in half.
Inspect chimneys carefully throughout the building for evidence of holes, cracks, or damage, but pay special attention to brick chimneys that may split and actually break apart in their lowest sections.
We suspect that the combination of the heavy weight of a very tall brick masonry flue combined with the use of soft bricks and construction that used only a single brick width to form the thickness of the chimney caused the severe splitting of the brick masonry flue shown in these two basement photos.
This damage pattern is more likely to be found on single-wythe thick brick chimneys than on chimneys built with multiple thickness of bricks forming the chimney wall.
This chimney was in use and was very dangerous. The hazards of a split brick chimney include at least these:
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