How many inches must a masonry embedded rod be embedded into the masonry?

The correct requirement for embedding a masonry rod is indeed a minimum of 4 inches into the masonry. This depth is specified to ensure sufficient structural support and stability of the assembly. When a rod is embedded at this depth, it helps achieve the necessary bond with the masonry material, enhancing the overall strength and integrity of the construction.

Embedding a rod properly minimizes the risk of pullout or failure under load and is essential for maintaining structural resilience against environmental forces such as wind and seismic activity. The 4-inch requirement is a common standard that reflects a balance between practical construction methods and the need for strength.

In contrast, other embedment depths, such as 2 inches, 6 inches, or 7 inches, either do not provide enough anchorage to prevent movement or could be unnecessarily excessive without added benefits for most conventional masonry applications. Hence, the precise standard of 4 inches is set to ensure compliance with safety and structural performance guidelines in residential building construction.