A cross section, also simply called a section, represents a vertical plane cut through the object, in the same way as a floor plan is a horizontal section viewed from the top. In the section view, everything cut by the section plane is shown as a bold line, often with a solid fill to show objects that are cut through, and anything seen beyond generally shown in a thinner line. Sections are used to describe the relationship between different levels of a building. A sectional elevation is a combination of a cross section, with elevations of other parts of the building seen beyond the section plane. Geometrically, a cross section is a horizontal orthographic projection of a building on to a vertical plane, with the vertical plane cutting through the building. A section drawing is a vertical- cut through of a space or object . Typical section drawings can be drawn of an entire building, individual interior space, or object such as built-in cabinet. Sections of spaces in interior drawings are sometimes confused with interior elevations and details.
Section drawings for spaces may illustrate similar items as elevation drawings. But section drawings are different from elevation drawings in that they are primarily intended to show the construction of the wall, floor, ceiling, or the object being cut through. Sections aim to show relationships of how different parts are constructed together in a space rather than the items attached to walls. So, a section drawing also presents the construction elements that create the boundaries of spaces, while as an elevation drawing focuses on the characteristics of the surfaces of the boundaries represented as single lines on the drawing. When a cut-through line is very close to the objects, not inside objects, it usually gets to illustrate vertical shapes as shown on elevation drawings, causing confusion between a section and elevation.
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