What characteristic do split face CMUs have on their faces?

Split face concrete masonry units (CMUs) are recognized for their distinctive surfaces, which reveal the aggregate within the block. This exposure creates a textured finish that adds character and aesthetic appeal to the masonry. The process of splitting the block before it fully cures results in a rugged, irregular surface, distinguishing it from other types of CMUs that might have smooth or uniformly finished faces.

The exposed aggregate not only enhances visual interest but also serves functional purposes, such as improving surface adhesion for finishes and providing increased texture for better grip. This characteristic makes split face CMUs popular in both commercial and residential construction, particularly in applications where a decorative element is desired while maintaining the durability and strength of traditional concrete blocks.