17.25.070 Foundation system footings.
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Footings at the exterior perimeter shall be installed with the bottom of the footing 18 inches below grade for frost protection. Footings for the main frame longitudinal members must be 18 inches below grade only if frost heave is likely to occur. (Ord. M-3863 §27, 2008; Ord. M-2631 (part), 1986)