(1) In clay-type soils subject to significant movement with a change in soil moisture content, the foundation depth of carports or garages connected to a house or an individual dwelling unit directly or by a breezeway shall be approximately the same depth as the foundation of the main building.
(2) Where slab-on-ground construction is used, a construction joint shall be provided between the main building slab and the garage or breezeway or carport slab.
(3) Except as provided in Section 9.12., foundations for attached unheated garages or carports shall be below frost level.