What is a unit with nominal dimensions based on 4" called?

A unit with nominal dimensions based on 4 inches is referred to as a modular unit. This designation comes from the practice of using specific, standardized measurements to facilitate construction and design. In masonry, a modular unit typically includes concrete blocks that are designed to be easily laid out and combined with other building materials, allowing for seamless integration into various construction projects.

Modular units are advantageous in ensuring that walls and structures are easy to plan and construct since they relate to the modular planning system used in architecture. This system often incorporates multiples of a base dimension, like 4 inches, leading to a cohesive and manageable building process. By using modular units, builders can accurately calculate material needs, minimize waste, and ensure consistent spacing and alignment during construction.

While other types of units like standard blocks and dimensioned stones exist, they do not have the specific nominal dimension basis that defines modular units. Standard blocks can vary in size and do not specifically adhere to the 4-inch nominal dimension for all applications. Metric blocks, on the other hand, follow the metric measurement system rather than the imperial system that typically uses inches, and dimensioned stones are cut and finished natural stones rather than standard modular units.