What are Open Web Joists?
Open Web Joists are structural members with open spaces between their chords, used to support floors, roofs, and long spans.
Definition
Purpose
The main purpose of Open Web Joists is to support loads while keeping the framing lighter and more flexible for building systems.
Because of their open shape, Open Web Joists can make coordination easier for mechanical, electrical, and plumbing work. An open web steel joist can also help reduce the need for deeper beams in certain roof or floor framing designs.
Examples of Use
- A contractor installs Open Web Joists to support the roof of a warehouse.
- An engineer specifies an open web steel joist for a commercial building with long roof spans.
- A mechanical crew runs ductwork through the open spaces in Open Web Joists.
- A steel estimator measures Open Web Joists as part of the structural framing takeoff.
Related Terms
Notes
- Open Web Joists are commonly used in roof and floor framing.
- An open web steel joist is often used in commercial and industrial construction.
- The open web design can make it easier to route ducts, pipes, and electrical conduit.
- Open Web Joists can help reduce weight while still providing structural support.
- Joist size, spacing, span, and load requirements can affect material cost, labor, and estimating.
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