4.1.7.4.(1)

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 the excessive deformation of, or excessive stress in, interior walls and partitions, which could lead to damage to the building.