In areas not subjected to freezing, how deep must footings in masonry chimneys be below finished grade?

Footings for masonry chimneys in areas not subjected to freezing must be a minimum of 12 inches below finished grade to ensure adequate support and stability. This depth helps distribute the weight of the chimney evenly while also preventing issues that may arise from soil movement or settlement.

By being set at this specified depth, the footings can better resist potential lateral forces and any shifts in the surrounding soil. Additionally, allowing for a deeper footing can minimize the risk of moisture-related issues in the chimney structure itself, as it helps in keeping the chimney's base away from surface water and frost heave, even if freezing conditions are not expected.

Choosing a shallower depth would not provide the same level of security against these factors, potentially leading to structural problems in the chimney over time.