What is the recommended projection on each side of a chimney footing?

The recommended projection on each side of a chimney footing is typically 8 inches. This measurement is crucial for ensuring stability and proper drainage around the chimney. An 8-inch projection allows for adequate support of the chimney structure and helps to prevent water from pooling at the base, which can lead to erosion or damage over time. This overhang also accommodates the chimney's potential movement and expansion due to temperature variations, ensuring that the footing remains effective in supporting the chimney.

In construction practice, an insufficient projection could compromise the chimney's structural integrity, making the 8-inch recommendation a vital standard in carpentry and masonry work. This consideration promotes longevity and safety in building designs.