Which part of a block is referred to as the 'shell'?

The term "shell" in the context of masonry blocks refers specifically to the sides and ends of the blocks. This part is critical for providing structural integrity, as it comprises the exterior surfaces that support loads and define the block's geometry. The shell acts as the framework that surrounds the interior of the block, which could include hollow cores or other internal features designed for insulation or weight reduction.

Understanding the shell's role is essential for proper masonry practices, as it influences how blocks interlock and bear weight when laid together. The construction process often emphasizes ensuring that the shell is adequately formed to promote strength and durability in the overall masonry assembly. This distinction is foundational in masonry, impacting both aesthetic and functional aspects of the blockwork.