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9.10.11.2.(2)
OS1OP3
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Continuity of protection of walls described in Sentence 9.10.11.2.(1) [party walls on property lines between dwelling units, where the walls are constructed as fire separations having not less than a 1 h fire-resistance rating ].
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are of residential occupancy and in which there is no dwelling unit above another dwelling unit.
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Intent
Intent 1: 
To limit the probability that a party wall will not be continuous, which could lead to gaps or openings in the party wall during a fire, which could lead to the spread of fire from one building to another, which could lead to harm to persons in the building not originally involved in the fire.
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