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9.3.1.4.(1)
ApplicationIntent
OS2OP2OH1OS1OS3OH4
ObjectiveOS3 Safety in Use
Attribution
[F20,F80-OS3.1] Applies to floors and elements that support floors.
[F20,F80-OS3.4] Applies to concrete used in chimneys or fireplaces.
Application
Application 1: 
Aggregates, in 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 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].
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Intent
Intent 1: 
To limit the probability that the use of inappropriate aggregate materials or the presence of an excessive proportion of contaminants in aggregates will lead to the premature failure of concrete under expected environmental or structural loads.
This is to limit the probability of:
  • compromised structural integrity, or
  • where concrete supports or is used in an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements, which could lead to compromised structural integrity.
This is to limit the probability of:
  • uneven concrete floor surfaces, which could lead to tripping,
  • excessive deflection or vibration of supported wood-frame floors, which could lead to a loss of balance, tripping or falling, and
  • failure of fireplaces or chimneys, which could lead to the leakage of combustion products, including carbon monoxide gas, into living space, which could lead to the asphyxiation or acute poisoning of persons.
This is to limit the probability of harm to persons.
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