Step Footings

Stepped footings may be required on sloping sites or where there is an unstable soil pocket under a footing. They may also be required in split-level houses and walk-out basements. Unless placed on rock, the bottom of each run level of the footing should be placed on undisturbed soil or compacted granular fill. The vertical part of the step should be placed at the same time as the footing.

The vertical connection between footings at the step should be concrete at least 150 mm (6 in.) thick and the same width as the footings (Figure 35). On steep slopes, more than one step may be required. Except in rock, the vertical distance between steps should not exceed 600 mm (24 in.), and the horizontal distance between steps should not be less than 600 mm (24 in.).

Figure 35

Source : Canada Mortgage and Housing Corporation (CMHC)

(1)  Where step footings are used,

    (b)   the horizontal distance between risers shall be not less than 600 mm.

Article 9.15.3.9. Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.