What is referred to as a ledge on a footing for supporting masonry?

A ledge on a footing that supports masonry is specifically called a brick seat. A brick seat is designed to provide a stable and level surface for the masonry units to rest upon, ensuring proper alignment and structural integrity. It plays an important role in transferring loads from the masonry above to the footing below.

The other options, while related to different components in construction, do not specifically refer to the ledge supporting masonry. A cement seat and block seat refer to similar supports but are not the conventional terms used in this context. The column base is a distinct element that supports vertical loads from columns and is not directly associated with supporting masonry in the way a brick seat is. Understanding these distinctions is crucial for proper terminology and application in carpentry and masonry work.