Steel joist and joist girders from New Millennium

Standard Joists and Girders

The key components of your structural steel building system

Standard steel joists
Open-web steel joists and joist girders reduce costs and project timelines

Standard steel joists and joist girders are crucial, tried-and-true components of your roofing and flooring building system. Our joists and girders are engineered and manufactured in accordance with the specifications of the Steel Joist Institute. New Millennium specialists can provide early design and engineering assistance to help your project reach its most cost-effective and performance-optimized potential.

Joist girders serve as primary framing members with simple spans to support concentrated loads for a roof or floor system. These concentrated loads often include standard steel joists that are in turn supporting steel roof or floor deck. The open-web design of steel joists and joist girders introduce a range of cost and performance advantages: reducing project weight; allowing for seamless integration of mechanical, electrical, and plumbing (MEP) systems; and making erection easier and faster. Individually and combined, those benefits save time and money. Many of these same benefits can be realized in multi-story construction applications with composite joists and deck.

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SJI 45th edition

The latest load tables for steel joists and joist girders.

Parallel Chord Joist

Parallel Chord Joist

Single-Pitched Top Chord Joist

Single-Pitched Top Chord Joist

Double-Pitched Top Chord Joist

Double-Pitched Top Chord Joist

Single-Pitched Top Chord Joist

Joist Girder Point Configurations

  • K-, LH- and DLH-Series steel joists
  • Joist girders and LH- and DLH-Series joists available as single- or double-pitched
  • Single-piece steel joists can be produced up to 90 feet long
  • Joist girders: 20-inch to 120-inch depths; 20-foot to 120-foot spans
Load tables

Download our design and specification guides PDF, updated with current standards and load tables.

Credit hour: How BIM helps

Learn about the cost and performance advantages of BIM when applied to steel joist design.

Multi-story construction

Explore the advantages of composite joist and deck systems to optimize multi-story construction projects.

Load zone joist design

Load Zone Joists can be designed as either K- or LH-Series joists to support concentrated loads residing in specific areas defined as “load zones.” With boundaries of zones defined and the corresponding concentrated load specified, New Millennium can design a more efficient joist and substantially reduce steel material costs for your project.

The designer may specify as many loads and corresponding “load zones” as needed. The fewer zones specified, the more efficient the joist will be.

  • Reduces cost through more-efficient steel joist design
  • Design as either K- or LH-Series joist
  • Shear and moment envelopes are developed for all load cases within the zones, and the joists are designed accordingly, including any stress reversal which may occur
Load Zone Chart

Load Zone Joists can be designed to support concentrated loads residing in specific areas defined as “load zones.” With boundaries of zones defined and the corresponding concentrated load specified, New Millennium can design a more efficient joist.

Did You Know
Steel Joists and Deck
3 reasons steel joists excel

Here’s why standard steel joists have been used for almost a century as a key part of countless projects.

Cover of Steel Joist Brochure
Steel joists brochure

Get in-depth information about steel joists and joist girders, including load zone joist design and BIM design.

Building a better steel experience