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9.3.1.7.(2)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F20,F21,F61,F55-OH1.1] Applies where concrete supports or is used in the walls of chimneys or fireplaces.
[F20,F21-OH1.2,OH1.3] Applies where concrete supports or is used in an environmental separator.
Application
Application 1: 
Maximum size of aggregate for site-batched, cast-in-place concrete that is not required to be reinforced that is used in:
  • footings, foundation walls, walls, columns, grade beams and piers,
  • 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].
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Intent
Intent 1: 
To limit the probability that the concrete will not flow around the aggregate in the typically thin wall and slab sections used in Part 9 buildings, which could lead to aggregate segregation, which could lead to:
  • reduced compressive strength,
  • increased shrinkage and cracking, or
  • low resistance to air and moisture transfer.
This is to limit the probability of:
  • spalling,
  • inadequate performance, or
  • premature failure of concrete under expected environmental or structural loads.
Where concrete supports or is used in the walls of chimneys or fireplaces, to limit the probability of the inadequate performance or premature failure of concrete under expected environmental or structural loads, which could lead to the failure of these walls.
This is to limit the probability of the leakage of combustion products, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
Intent 2: 
To limit the probability that the concrete will not flow around the aggregate in the typically thin wall and slab sections used in Part 9 buildings, which could lead to aggregate segregation, which could lead to:
  • reduced compressive strength,
  • increased shrinkage and cracking, or
  • low resistance to air and moisture transfer.
This is to limit the probability of:
  • spalling,
  • inadequate performance, or
  • premature failure of concrete under expected environmental or structural loads.
Where concrete supports or is used in an environmental separator, to limit the probability of the inadequate performance or premature failure of concrete under expected environmental or structural loads.
This is to limit the probability of:
  • the compromised integrity of the environmental separator, or
  • an inadequate resistance to air and moisture transfer through the concrete.
This is to limit the probability of:
  • pollutant ingress (from the exterior or from adjacent interior space, including soil gas, combustion products from parking garages, and particulates),
  • precipitation ingress,
  • condensation,
  • the ingress of moisture from the ground, or
  • the compromised thermal performance of components intended to provide resistance to heat transfer.
This is to limit the probability of:
  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • deterioration, which could lead to further compromised integrity of environmental separators, or
  • an inadequate control of indoor air and surface temperatures, drafts, relative humidity, or water accumulation.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of harm to persons.
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