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9.3.1.9.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F20,F80-OH1.1] Applies where concrete supports or is used in the walls of chimneys or fireplaces.
[F20,F80,F61,F55-OH1.1,OH1.2] [F20,F80,F61-OH1.3] Applies where concrete supports or is used in an environmental separator.
Application
Application 1: 
Minimum and maximum temperatures of 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,
  • crawl space ground cover, and
  • basement floors, including floors of basement garages, providing lateral resistance to foundation walls.
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 of:
  • an excessive loss of water due to evaporation,
  • the freezing of concrete before the initial set,
  • slowed hydration of the concrete, or
  • the freezing and expansion of the excess water not used in hydration.
This is to limit the probability of:
  • a failure to develop sufficient compressive strength before building loads are applied,
  • shrinkage and cracking, or
  • the failure of internal bonds.
This is to limit the probability of:
  • where concrete supports or is used in an environmental separator
    • the compromised integrity of the environmental separator, or
    • an inadequate resistance to air and moisture transfer through the concrete, and
  • where concrete supports or is used in the walls of chimneys or fireplaces, the failure of these walls.
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,
  • the leakage of combustion products, 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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