What material is most commonly used for CMUs?

The most commonly used material for Concrete Masonry Units (CMUs) is concrete. CMUs are essentially precast concrete blocks that are widely utilized in construction because of their strength, durability, and thermal efficiency. Concrete, as the primary material, provides the necessary structural integrity and resilience that buildings require.

Additionally, CMUs are designed to be versatile and can be used for a variety of applications, including load-bearing walls, foundations, and partitions. Their relatively low cost and ease of installation further enhance their popularity in the masonry industry. While wood, steel, and brick are valuable materials in their own contexts, they do not serve the same purpose or offer the specific advantages that concrete provides in the construction of CMUs.