What is the function of mortar in masonry?

Mortar plays a crucial role in masonry as it serves as the binding agent that holds the masonry units—such as bricks or blocks—together. Its primary function is to fill the joints between these units, ensuring that they are securely connected and providing structural integrity. Mortar not only supports the weight of the masonry above it but also acts as a cushion to accommodate slight movements caused by temperature changes or settling of the structure.

While insulation and color may be important attributes of a building's design and functionality, they are not primary functions of mortar. Insulation is typically achieved using materials specifically designed to reduce heat flow, while the aesthetic aspects, such as color, are often determined by the choice of masonry units themselves rather than the mortar. Furthermore, mortar is not a substitute for bricks; instead, it complements them by enhancing the overall strength and durability of the masonry assembly.