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9.3.1.1.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOS1 Fire Safety
Attribution
[F20,F21,F80-OS1.1] Applies where concrete supports or is used in chimneys or fireplaces.
Application
Application 1: 
Design, mixing, placing, curing and testing of cast-in-place concrete that is not required to be reinforced that is used in:
  • footings, foundation walls, walls, columns, grade beams and piers,
  • crawl space ground cover,
  • basement floors, including floors of basement garages, subject to hydrostatic pressure or providing lateral resistance to foundation walls,
  • garage and carport floors,
  • exterior steps, including steps providing structural support (to guards or handrails, for example), and
  • fireplaces and chimneys.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated is Sentence 9.3.1.1.(2), which applies to unreinforced site-batched concrete.
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Intent
Intent 1: 
To limit the probability of the inadequate performance or premature failure of concrete under expected environmental or structural loads.
Where concrete supports or is used in chimneys or fireplaces, this is to limit the probability of the compromised integrity of the chimney or fireplace, which could lead to the ignition of combustible building components.
This is to limit the probability of harm to persons.
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