A concrete masonry unit installed over openings to create bond beams is called what?

A concrete masonry unit installed over openings to create bond beams is referred to as a lintel. Lintels are structural elements that support the load above openings such as doors and windows. They are essential in maintaining the integrity of a wall by transferring the weight from above the opening to the surrounding wall structure.

In this context, the lintel is specifically designed to carry the load of the masonry and that of any structural elements above it, ensuring that the opening remains stable and functional without compromising the overall strength of the wall. The choice of material for a lintel can vary, but concrete masonry units are often used due to their durability and strength.

In contrast, the other options refer to different components or features in masonry construction. A stretcher refers to a unit laid with its long side facing out, typically used in the body of a wall rather than over an opening. A corbel is a projecting support from the wall, often used for decorative purposes or to support structures like a beam. A jamb refers to the vertical sides of an opening, such as a door or window, rather than an element itself that spans the opening. Each of these terms serves a unique purpose in masonry construction and is distinct from the role of a lintel.