Which of the following best describes the core purpose of CMUs in construction?

The core purpose of concrete masonry units (CMUs) in construction primarily revolves around support and insulation. CMUs are widely used as structural elements that provide strength and stability to buildings and load-bearing walls. They are engineered to bear heavy loads, making them essential for constructing foundations, walls, and various structural components.

In addition to their structural capabilities, CMUs offer some insulating properties. The thermal mass of concrete can help regulate temperature in a structure, contributing to energy efficiency and comfort within buildings. This dual functionality of providing both support for the building and some insulation makes CMUs a versatile and essential material in modern construction.

While options such as decoration and design, finishing and surfacing, and soundproofing are relevant in specific contexts, they do not encompass the primary functions of CMUs as robust building blocks that ensure structural integrity and offer limited insulation benefits.