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4.1.7.4.(1)
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Due consideration to differences in air pressure on opposite sides of interior walls or partitions of buildings.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be designed in accordance with the requirements of Part 4.
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Intent
Intent 1: 
To limit the probability that the design of interior walls and partitions will not take into account the:
  • wind action on and within the building,
  • stack effect due to the difference between the outdoor and indoor temperature, and
  • mechanical air pressurization of the building.
This is to limit the probability that the difference in air pressure on opposite sides of a wall or partition will exceed the capacity of the wall or partition, which could lead to structural failure of interior walls and partitions, which could lead to harm to persons.
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