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9.10.11.2.(3)
OS1OP3
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Fire stopping of any spaces between the top of the wall described in Sentence 9.10.11.2.(1) [a party walls on a property line between dwelling units, where the wall is constructed as a fire separation having not less than a 1 h fire-resistance rating ] and the roof deck.
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 fire will spread through spaces between the top of a party wall and a roof deck, which could lead to the spread of fire into the roof deck 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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