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Prior to the time around
1940, most standard chimneys were built with the thickness of a single layer
of brick and a coating of limestone mortar (parging) being used to coat the
inside walls of the chimney flue. With time, age and usage this
material wears away. Even in its best condition, this design
is not well suited to stand the high temperatures of a chimney flue fire
since heat can move through the brick chimney walls very quickly. It
is referred to as an 'unlined chimney' and does not comply with building
codes.
According to the
Chimney Safety Institute of
America, 'Never use a chimney that does not have a liner or has a damaged or
improper lining!'
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