Steel Joist

Definition

A steel joist is an open web, parallel chord, load-carrying member suitable for direct support of floors and roof decks, utilizing hot-rolled or cold-formed steel.

Purpose

The purpose of a steel joist is to provide a lightweight yet strong support structure for floors and roofs, enabling longer spans and reducing the need for intermediate supports.

Examples of Use

• Commercial buildings use steel joists to support wide-span floors and roofs, allowing for open interior spaces.
• Industrial facilities employ steel joists for their strength and ease of installation in supporting heavy machinery and equipment.
• Warehouses use steel joists to create large, unobstructed storage areas.

Related Terms

• Truss: A framework of beams forming a rigid structure, often used in roofs and floors.
• Roof Deck: The structural surface to which the roofing material is applied.
• Load-Bearing: Capable of supporting weight or stress.

Notes

Steel joists are favored in construction for their high strength-to-weight ratio, ease of installation, and ability to support large spans with minimal material use.