New Millennium Building Systems

Steel Joist & Deck

Standard Steel Joist

Steel Joists and Joist Girders

New Millennium engineers and manufactures a full range of standard steel joists, also called “bar joists”, including composite joists (CJ-Series) and Joist Girders. We can provide early design assistance for total-project cost optimization. We also offer load zone joist design − all locally available through our six nationwide plant locations in accordance with the specifications of the Steel Joist Institute.

Standard Steel Joists

Steel joist products include K, LH and DLH Series joists, designed and manufactured in accordance with the specifications of the Steel Joist Institute. Single piece joists can be produced up to 120 feet long, with field splices used to increase lengths and depths. Available with either under-slung or square ends. Contact your local New Millennium facility.

  • LH-Series and DLH-Series available with single-pitched or double-pitched top chords
  • Furnished with standard SJI camber per SJI Table 103.6-1, unless specified otherwise
  • Depth indicated in joist designation is determined by the depth of single-pitched joists at the center of span and at the ridge centerline of double-pitched joists
  • When top chord slope exceeds 1/2”:12”, total and live top chord uniform loads must be provided
Standard Steel Joists
Composite Joists

A composite joist (CJ-Series) is a steel joist designed for shear connection to the overlying concrete slab using field applied shear studs, such that when the decking is filled with concrete, the shear studs become embedded in the hardened concrete and a unified load bearing system is created that deflects as a single unit. Advantages can include a stronger, stiffer, lighter and less cost steel structure compared to other structural steel frame approaches. These advantages need to be evaluated based on offsetting costs for field installation of the shear studs. The specifying engineer may also consider composite decking. For more information, see the SJI CJ-Series catalog.

  • Reductions in steel material and related costs
  • Open web joists allow routing of MEP for lower floor-to-floor height
  • Wider spaced and fewer columns for more open bays
  • Stiffer floors for reduced live load deflections and reduced vibration
  • Shortened construction timeline
Composite Joist (CJ)
Steel Joist Girders

Joist Girders are open web steel trusses that serve as primary framing members. They are designed as simple spans to support concentrated loads for a floor or roof system. These concentrated loads are normally considered to act at the top chord panel points of the Joist Girders. For more information, see our Steel Joists and Joist Girders catalog.

  • Often more cost effective than wide flange steel beams
  • Comparably easier and faster erection
  • Open web design allows for MEPs integration
  • Standard depths from 20 inches to 120 inches
  • Spans from 20 feet to 120 feet
  • Available with single-pitched or double-pitched top chords up to 1/2":12"
Steel Joist Girders Configuration
Load Zone Joist Design

An alternative to specifying KCS series joists is to specify joists designated as KZ to support the concentrated loads residing in specific areas defined as “load zones”. With the boundaries of the zones defined and the corresponding concentrated loads specified, New Millennium can substantially engineer steel material costs out of a 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 costs through more efficient steel joist design
  • Designed as either K or LH series
  • 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 Joist Design 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