Sentence 9.21.4.6.(1)

  1. OS2
  2. OS1
  3. OP1
  4. OH1
  5. OS3

Objective

OS1 Fire Safety

Attribution

Intent

Intent 1:

To limit the probability that cracks in the masonry or gaps between the masonry and the liner will lead to the ingress of precipitation or melting snow into the chimney, which could lead to damage to the masonry or to the liner due to freeze-thaw stresses, which could lead to the escape of heat or flames, which could lead to the ignition of combustible building components, which could lead to harm to persons.

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