What does thermal mass in masonry construction refer to?

Thermal mass in masonry construction specifically refers to the ability of materials to absorb and store heat energy. When masonry materials, like bricks or concrete, are exposed to sunlight or higher temperatures, they can absorb this heat during the day. Later, during cooler periods, they release that stored heat slowly. This characteristic helps regulate indoor temperatures, provides thermal comfort, and enhances energy efficiency by reducing the need for heating and cooling systems.

The other options do not capture this concept effectively. For instance, while the weight of masonry materials may contribute to their thermal properties, it does not directly define thermal mass. Similarly, the thickness of walls can influence insulation but is not synonymous with thermal mass itself. Lastly, the type of materials used may impact their thermal properties but does not specifically address the capacity to store heat energy, which is the defining feature of thermal mass.