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9.10.16.1.(7)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Vertical fire stopping of concealed spaces in mansard or gambrel style roofs, exterior cornices, balconies and canopies of combustible construction in which the exposed construction materials within the space have a surface flame-spread rating exceeding 25, at locations where the concealed spaces extend across the ends of required vertical fire separations.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that certain concealed spaces [at the ends of required vertical fire separations] in mansard or gambrel style roofs, exterior cornices, balconies and canopies will not be fire stopped, which could lead to the spread of fire from one side of the fire separation through these spaces to the other side of the fire separation, which could lead to harm to persons on the other side of the fire separation.
Intent 2: 
To limit the probability that concealed spaces in mansard or gambrel style roofs, exterior cornices, balconies and canopies will not be separated, which could lead to the spread of fire within these spaces, which could lead to harm to persons.
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