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9.21.3.9.(2)
OP1OH1OS2OS3OS1
ObjectiveOP1 Fire Protection of the Building
Attribution
Application
Application 1: 
Mortar bed for chimney liners for rectangular masonry or concrete chimneys that are not more than 12 m in height, for oil- or gas-burning 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:
  • contact with flue gases will lead to corrosive damage to mortar, or
  • flue gas condensate will leak from joints in chimney liners, which could lead to corrosion or freeze-thaw damage to surrounding masonry.
This is to limit the probability of the escape of heat or flames, which could lead to the ignition of combustible building components, which could lead to damage to the building.
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