Which drawing type illustrates structures behind walls or above ceilings?

A section drawing is specifically designed to illustrate internal structures that are not immediately visible in standard views, such as those behind walls or above ceilings. This type of drawing provides a cut-through view of a building or object, allowing one to see the arrangement of various elements such as beams, ducts, plumbing, and insulation within the walls and above the ceilings. By slicing through a section of the structure, it becomes easier to understand how these systems interact and support the overall design.

Detail drawings focus on specific parts of the construction and typically highlight joinery, materials, or intricate design elements, rather than providing a comprehensive view of the internal layout. Elevation drawings present exterior views of a building, showcasing façade details but not hidden structures within. Concept drawings, on the other hand, are often preliminary sketches that communicate ideas or intentions rather than precise structural information.