They are generally the scale of the exterior elevations (but sometimes smaller) and aren’t meant to have a lot of specific information or notes. Building Sectionsīuilding sections are created by slicing through the entire building from exterior wall to exterior wall. Below, the types of sections are described from the smallest scale (showing the largest portion of a building) to the largest scale (showing the most detail). There is a sort of hierarchy to section drawings – each section serves as a key for the section with the next level of detail. Each serves a specific role and is meant to indicate specific information. There are a few different types of section drawings that are used in a construction drawing set. In some cases, building sections may jog so that one drawing can slice through several important spaces that a single plane would not have cut through. Section cuts are indicated on the plans and elevations with the following symbols below. The voids will show everything beyond with a lighter line weight. You can read a section drawing once you understand that any element that has been cut through is represented with a heavier line weight which helps to make that portion of the drawing “pop.” The elements that are cut are then hatched, either generally showing that it’s a solid element or with a specific hatch to indicate the type of material. Likewise, for interior spaces, the arrangement of acoustic panels in an auditorium or the construction of open stairs in a lobby can’t be easily communicated only in the plans and RCPs. Elements like the profiles of cornices and moldings, the depth of an overhang, or the construction that holds the façade in place can’t be seen in elevation. Sections are essential because when a building is only viewed in elevation, many of the elements seen cannot be fully understood. Slight variations can often be inferred from the typical details or other drawings. The drafter will need to draw as many sections as required to explain the construction of the building, but no more. The sections are generally cut through the entire building, through typical conditions (explained here), unique spaces, complex volumes, and a-typical conditions that need more explanation. Once these conditions are figured out, the final drawings communicate these conditions to the contractor. They could be used to illustrate a large volume within the building or describe how a rafter meets the top plate of a wall. It may or may not show the building elements in elevation beyond.Īrchitects use sections of different scales to explore how all the components fit together, but usually consist of three: building sections, wall sections, and section details (more on each below).
The slice is typically made perpendicular to the wall it is cutting through. On one side of the plane, the building is removed so that the construction of whatever is sliced can be seen.
Section Perspective What is a section drawing?Ī section is an orthographic 2D drawing that uses an imaginary vertical plane to “cut” the building.Types of architectural section drawings.
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