Quality Steel Joists Solution for Commercial & Industrial Construction
For over 30 years, Foremost Buildings has earned the trust of contractors and engineers throughout the United States as a reliable barjoist supplier known for quality craftsmanship and dependable service. Using high-quality steel, our K-Series and LH-Series steel joists deliver durable, adaptable framing solutions for warehouses, manufacturing facilities, commercial and industrial construction projects.
Our team works closely with contractors, engineers, and architects from planning through fabrication and delivery, to keep every project on schedule and on budget. Every steel joist is engineered up to Steel Joist Institute (SJI) standards and fabricated following AWS guidelines at our Wisconsin facility.
Understanding Steel Joists
Steel joists are lightweight steel trusses used as secondary framing to support roof and floor systems in commercial and industrial buildings. They serve as the medium that transfers loads from the roof or floor down to the main structural elements, such as beams and columns.
Steel joists are built from top and bottom chords connected by diagonal and vertical web members, rather than a solid web. This open-web design gives them a high strength-to-weight ratio while leaving space for mechanical, electrical, plumbing, and fire protection systems to run directly through the joist rather than around it, simplifying trade coordination and reducing overall construction time.
As a trusted steel joist manufacturer, Foremost engineers and fabricates these structural steel joists for warehouse, institutional, and agricultural buildings.
Why Choose Steel Joists
Steel joists are typically selected because they:
- Provide long, clear spans across wide building widths and lengths
- Reduce overall structural weight relative to traditional framing materials
- Lower total construction cost versus alternative framing systems
- Speed up installation timelines for steel roof and floor joist systems
- Create large, open interior spaces suited for a variety of layouts
- Offer flexibility for future building modifications and expansions
Our Steel Joist Products: K-Series & LH-Series
We manufacture two primary steel joist types, selected based on span length, load requirements, and building type. We can also design and deliver special steel joists based on your project needs, with our team working directly with you to determine the right fit.
K-Series Steel Joists
K-Series joists are the standard open-web steel joist, known for a shallower profile and straightforward web configuration compared to other series. This lightweight design makes them a cost-effective and efficient structural framing solution for short-to-medium-span applications, while still delivering reliable load-bearing performance.
Characteristics:
LH-Series Steel Joists (Longspan)
LH-Series longspan steel joists handle wider spans and heavier loads than standard K-Series joists. Their deeper profile and reinforced webs reduce the need for interior columns, opening up floor plans for warehouses and industrial facilities. Every Foremost LH-Series joist is shop-primed and built to SJI standards.
Characteristics:
Steel Joist Types: K-Series vs. LH-Series – Which One Do You Need?
|
Aspects |
K-Series |
LH-Series (Longspan) |
|---|---|---|
|
Joist type |
Standard-duty steel joist |
Heavy-duty longspan steel joist |
|
Profile |
Shallower profile |
Deeper profile |
|
Standard depth range |
2.5-30 |
18-48 |
|
Typical span range |
10-60 |
30-95 |
|
Web configuration |
Standard web configuration |
Additional web members |
|
Load capacity |
Standard loading capacity |
Higher load capacity |
|
Best for |
Short to medium spans, standard commercial framing |
Long spans, fewer interior columns, heavier roof/floor loads |
|
Relative cost |
Economical framing on typical commercial buildings |
Wide-open layouts with fewer interior columns |
Engineering & Design Support
Every Foremost steel joist project starts with listening – our team meets with contractors, engineers, and architects to understand your project’s vision, structural requirements, schedule, and budget before our in-house, PE-licensed engineers begin the technical review.
Engineering Services
Using advanced structural design software, our engineers perform load analysis and joist selection, coordinating with the structural engineer of record (EOR) to confirm span, load, and configuration requirements.
Shop Drawings
Once a design is approved, our in-house detailing team builds a full 3D model of the joist – chords, web members, and seats – and generates production-ready fabrication drawings and CNC files directly from it, keeping the submittal process on schedule.
Connection Detailing
Our engineers develop connection details for joist-to-beam, joist-to-wall, and bearing conditions, assisting in ensuring proper load transfer and code compliance at every joist connection.
Design Assistance
We provide guidance on joist selection, span optimization, and coordination with architects and contractors throughout the design phase, helping catch potential issues before they impact project cost or schedule.
Applicable Design Standards
All metal joists are engineered and fabricated in strict accordance with Steel Joist Institute (SJI) specifications and AWS welding standards, ensuring every product meets the highest levels of structural integrity and quality.
Fabrication Process
Inside our fabrication facility, skilled craftsmen transform steel into precision-built joists using plasma cutters, saws, and robotic positioning equipment, with connections welded by hand and by machine.
Quality Control
Inspectors carefully measure and verify weld quality and dimensional accuracy on every finished joist, checking alignment, camber, and overall structural integrity, and thoroughly documenting the results before each piece is cleared to leave the shop.
Welding Certifications
Our welders are certified in accordance with American Welding Society (AWS) standards, ensuring consistent, code-compliant weld quality on every joist.
Production Capacity
Our Wisconsin facility supports high-volume production, allowing us to take on projects ranging from single buildings to large multi-phase developments.
Typical Lead Times
Lead times vary by project size and complexity; our team provides a defined production schedule at the time of order to keep your project on track.
Agriculture
- Metal barns and livestock buildings
- Framing for farm storage structures
- Durable agricultural building solutions
Commercial
- Roof and floor support systems
- Framing for retail buildings
- Structural support for office buildings
Industrial
- Long-span manufacturing facilities
- Warehousing and storage buildings
- Distribution and logistics facilities
Municipal
- Structural framing for schools
- Fire stations and emergency facilities
- Community and civic buildings
Don’t see your project type listed? Contact us with your specific building needs.
Why Choose Foremost Buildings
1.
Experience
We have been designing and manufacturing pre-engineered steel building systems since 1995, giving us over 30 years of experience in steel fabrication and construction.
2.
Engineering Expertise
Our steel joists are engineered by PE-licensed structural engineers, with stamped drawings provided for every project.
3.
Fabrication Quality
Every joist is fabricated in-house at our 150,000-square-foot manufacturing facility, using 100% USA-made steel, giving us direct control over quality from raw steel to finished product.
4.
Built for Demanding Use
Our steel structures are engineered to handle heavy loads, cranes, and racking systems, and our joists are sized to meet the same standard for industrial and heavy-use facilities.
5.
Transparent Process
No hidden costs. From initial consultation through engineering, fabrication, and delivery, we provide clear communication and reliable timelines at every stage.
6.
Delivery Capabilities
Our shop supports rapid production, including 24/7 manufacturing capability when project timelines require it, to keep your schedule on track.
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Frequently Asked Questions
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Get Steel Joists Engineered for Your Project
Whether you’re framing a new warehouse, distribution center, or commercial building, Foremost’s engineering and manufacturing team is ready to help you select and produce the right steel joist solution. Share your project details, and we’ll follow up with the next steps.