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9.22.2.2.(3)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Offsetting of joints between firebrick liners and adjacent backing masonry, for masonry fireplaces constructed on-site, 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 fireplaces 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 6.2.1.5.(1).
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Intent
Intent 1: 
To limit the probability that corresponding cracks in firebrick liner units and backing masonry units will provide a path for the flow of flames or radiant heat, which could lead to the ignition of combustible building components, which could lead to harm to persons.
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