What do cross-sections show in building drawings?

Cross-sections in building drawings are essential for illustrating vertical cutaway views of the interior. This type of drawing provides insights into the internal structure and spatial relationships within a building, allowing designers and builders to visualize how different elements interact on various levels. It reveals details about floor heights, ceiling structures, wall thicknesses, and the configuration of rooms, thus providing a comprehensive understanding of the interior layout.

While other options may focus on aspects of drawing representations, such as overall building size or specific systems like piping and electrical, they do not capture the primary function of cross-sections, which is to depict the internal elements of the building as it would appear after a vertical slice has been taken through it.