How far must footings for masonry fireplaces extend beyond the face of the fireplace?

Footings for masonry fireplaces are required to extend beyond the face of the fireplace by 6 inches. This is to ensure proper support and stability for the fireplace structure, as well as to accommodate any potential lateral forces or settlement that might occur over time. The extended footing helps distribute the weight of the masonry evenly and prevents cracking or damage to the surrounding structures. This standard is crucial in maintaining the safety and integrity of the fireplace installation and is consistent with building codes that emphasize the importance of proper footing dimensions for various structural elements.