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9.21.3.10.(1)
ApplicationIntent
OS2OH1OS3OS1OP1
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.3]
Application
Application 1: 
Extension of chimney liners for rectangular masonry or concrete chimneys that are not more than 12 m in height and that serve fireplaces or appliances having a combined total rated heat output of 120 kW or less, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Application 2: 
This also applies to rectangular masonry or concrete chimneys, in buildings to which Part 6 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 6], as stated in Sentence 6.3.1.2.(1).
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Intent
Intent 1: 
To limit the probability that:
  • heat from a flue pipe will be conducted into unprotected chimney masonry, which could lead to damage to the masonry in the vicinity of the flue pipe connection,
  • rainwater will flow across the chimney cap and into the flue, which could lead to damage to the liner due to freeze-thaw stresses, which could lead to the ingress of condensed water vapour into the cavity between the chimney liner and the surrounding masonry, which could lead to damage to the masonry due to freeze-thaw stresses, or
  • mechanical or freeze-thaw damage to the extended portion of the liner will lead to blockage of the flue or subsequent freeze-thaw damage to the upper courses of surrounding masonry.
This is to limit the probability of the collapse of the chimney, which could lead to harm to persons.
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