A section drawing shows a vertical slice through a building, as if it were cut open, revealing internal structure, floor-to-ceiling heights, and how assemblies stack together.
Structural engineers and contractors rely on sections for details a floor plan or elevation can’t show.
What Does a Section Drawing Reveal?
- Wall assembly layering, from siding to interior finish
- Floor-to-ceiling heights
- How structural elements stack vertically
- Insulation placement within an assembly
Why Are Section Drawings Important?
A section through an exterior wall might reveal the exact layering order of siding, house wrap, sheathing, insulation, and drywall, clarifying how the wall assembly is meant to go together. Sections are especially important on complex builds with varying floor levels or vaulted ceilings, where a simple plan view can’t convey the vertical relationships.
Section Drawing vs. Elevation Drawing
An elevation shows a building’s exterior surface from the outside; a section cuts through the building to reveal what’s inside the walls and floors. Both are vertical-view drawings, but a section shows internal assembly detail that an elevation never touches.