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For Group R-3 occupancies and buildings of other occupancies less than two stories above grade plane of light-frame construction, the required thickness of plain concrete footings is permitted to be 6 inches (152 mm), provided that the footing does not extend more than 4 inches (102 mm) on either side of the supported wall.

Related Code Sections

1809.8 Soils and Foundations, Plain Concrete Footings
The edge thickness of plain concrete footings supporting walls of other than light-frame construction shall be not less than 8 inches (203 mm) where ...
1809.8 Soils and Foundations, Plain Concrete Footings
The edge thickness of plain concrete footings supporting walls of other than light-frame construction shall be not less than 8 inches (203 mm) where ...
1906.1 Concrete, Plain Concrete Footings
 thickness of plain concrete footings is permitted to be 6 inches (152 mm), provided that the footing does not extend more than 4 inches ...
14.1.4.1 Plain Concrete,
feet (1219 mm) of unbalanced fill. Walls shall have reinforcement in accordance with 14.6.1. •  Isolated footings of plain concrete ...