On sloped sites, footings must be kept level, so the footings will have to be stepped. Step lengths must be at least 2 ft., step heights must be no greater than three-quarters of step length, and vertical footing sections must be at least 6 in. thick.

The rise of a stepped footing should not exceed 2 ft., and the footing should run at least 2 ft. horizontally between steps (at top). Typically, the corners of a stepped excavation are unstable. The footing should be sloped and reinforced, so the effective horizontal length of the footing is supported on well-compacted soil (at bottom). 
The rise of a stepped footing should not exceed 2 ft., and the footing should run at least 2 ft. horizontally between steps (at top). Typically, the corners of a stepped excavation are unstable. The footing should be sloped and reinforced, so the effective horizontal length of the footing is supported on well-compacted soil (at bottom).