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3.2.1.2.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Basements used primarily as storage garages, where the floor and roof assemblies above the basements and the exterior walls of the basements above the adjoining ground level are constructed as fire separations of masonry or concrete having a fire-resistance rating of not less than 2 h.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
Exceptions: 
except as exempted in Sentence 3.2.1.2.(2), which applies to openings in exterior walls of basements where certain conditions are met.
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Intent
Intent 1: 
To allow a basement storage garage to be considered as a separate building from the portion above if certain measures are taken.
These measures are to limit the probability of the spread of fire from the garage to the upper portions of the building during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to harm to persons in the upper portions of the building, including emergency responders.
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