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9.4.4.4.(1)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
[F21-OS3.1] Applies to footings that support floors and other elements that support floors.
[F21-OS3.7] Applies to footings that support walls that contain doors or windows required for emergency egress.
Application
Application 1: 
Foundations located in areas where soil movement caused by changes in soil moisture content, freezing, or chemical-microbiological oxidation is known to occur to the extent that it will damage a building 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 moisture-content-related soil movement, frost heave, pressure due to the formation of ice lenses, adfreeze, and weathering of pyritic material will lead to the cracking of foundations or building superstructures.
This is to limit the probability of:
  • compromised structural integrity, or
  • for environmental separators or elements supporting environmental separators, 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:
  • the excessive deflection or vibration of directly or indirectly supported floors, which could lead to persons losing their balance, tripping or falling, which could lead to harm to persons, or
  • the excessive movement or deformation of directly or indirectly supported walls with windows or doors, which could lead to compromised operation of doors or windows required for egress in an emergency.
This is to limit the probability of harm to persons.
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