Dimensions and tying of reduced sections of solid concrete and unit masonry foundation walls that are installed on soils having an allowable bearing pressure of 75 kPa or greater, where the tops of the walls are reduced in thickness to permit the installation of a masonry exterior facing, for buildings of wood-frame or masonry construction to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

Exceptions: 

To limit the probability of an inadequate thickness or inadequate lateral support for concrete or unit masonry foundation walls, which could lead to an inability to support vertical building loads or lateral earth loads, which could lead to damage to the foundation or the superstructure.

Where elements support or are part of an environmental separator, this is to limit the probability of cracking, which could lead to:

• condensation,
• rainwater ingress,
• the ingress of moisture from the ground, or
• compromised thermal performance of components intended to provide resistance to heat transfer.

This is to limit the probability of:

• an inadequate control of temperatures of interior spaces, relative humidity, or water accumulation,
• the generation of pollutants from biological growth or from materials that become unstable on wetting, or
• compromised integrity of elements supported by foundations, which could lead to the deterioration of building elements.

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.