Deteriorated clay chimney liner

Heating · Metal Chimneys or Vents · printed page 171 (PDF page 172)

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Text in the illustration

Deteriorated clay chimney liner crack and chips on the exterior can allow rain and combustion products into the space between the liner and the brick pieces of liner may fall out and block the chimney gaps or cracks in the liner allow moisture from the rain or products of combustion to damage the chimney brick
crack and chips on the exterior can allow rain and combustion products into the space between the liner and the brick
pieces of liner may fall out and block the chimney
gaps or cracks in the liner allow moisture from the rain or products of combustion to damage the chimney brick

Generated explanation

A cutaway of a brick chimney shows a deteriorated clay flue liner extending above the chimney crown. The liner has a long crack, chipped areas, and missing sections. Callouts explain that these openings allow rain and combustion products into the space between the liner and the brick, where moisture can damage the masonry. A loose liner fragment and downward arrow illustrate how pieces can fall and obstruct the chimney.

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