What Is Factory Span? Interesting Facts About Span in Construction

In construction, the span is a critical technical factor that directly affects the design, structure, and cost of a building.
This is especially true in industrial facilities—such as factories or warehouses—where large, column-free spaces are required. Choosing the appropriate span can help businesses optimize costs and improve operational efficiency.

So, what is a factory span? How do you determine and apply it effectively in real-world projects? The following article will help you gain a better understanding of this important topic.

1. What is a Factory Span?

The factory span (in English: span) is the distance between two load-bearing columns or two main supporting structures in a workshop or warehouse.

The span is measured horizontally, perpendicular to the length of the building. It is a key factor in structural design and affects:

• Construction costs (as the amount of steel and materials used varies with the span)

• The layout of production equipment and storage

• The potential for future expansion or changes in building function

For example, a factory with a 20-meter span means the distance between two rows of columns is 20 meters.
In pre-engineered steel buildings, spans typically range from 12m to 20m. In larger factories, spans of 40m or even 60m (without center columns) are used to maximize usable space.

2. How Span Affects Factory Design and Cost

Choosing the right span not only ensures structural stability but also impacts economic efficiency. Specifically:

• Larger spans → stronger structures required, leading to increased steel and material costs

• Smaller spans → more columns, which may limit machinery layout and workflow

Therefore, design engineers must strike a balance: wide enough to serve the function efficiently, but still cost-effective and structurally sound.

3. Other Types of Span in Construction

Beyond factory buildings, the construction industry includes various types of spans depending on the project and structural components:

• Beam span: the distance between two beam supports

• Roof span: the spacing between roof truss or purlin supports

• Bridge span: the length between two main supports of a bridge

Each span type affects technical calculations, load-bearing capacity, material choices, and construction methods.

4. Related Concepts in Factory Building Design

In addition to span, several other terms are important when designing a factory:

• Column spacing: the distance between columns along the building’s length

• Building height: measured from floor level to the lowest or highest point of the roof

• Design load: includes dead load, wind load, crane load, and snow load (if applicable)

These factors are considered alongside span to ensure the most appropriate and efficient structural design.

5. How to Determine Span in Factory Construction

To determine the optimal span for a factory, engineers and investors typically consider:

• The intended use of the factory (production, storage, logistics, etc.)

• The need for column-free spaces (to allow equipment operation and movement)

• The financial capacity of the investor

• Site conditions, including wind, soil, and geography (which affect the structure and materials)

Typically, factory spans range from 12m to 14m. In specialized buildings or those using heavy-duty cranes, the span may reach 40m or more, though this comes with increased costs.

6. Diverse Applications of Span in Practice

Factory spans are not limited to industrial plants—they are widely used in various types of construction, such as:

Logistics centers: large spans create open, uninterrupted spaces

Learn more: Industial Buildings 

Exhibition halls and showrooms: large spans enhance visibility and usability

Learn more: Commercial Buildings 

Sports stadiums, auditoriums, gymnasiums: large, column-free spans provide unobstructed views

Advanced steel structure solutions like trusses, Zamil frames, and space frames have made large-span construction more feasible, modern, and flexible.

7. Conclusion

Understanding factory span is a crucial first step in planning and designing a cost-effective, sustainable, and efficient project.
Choosing the right span not only affects the structure but also the building’s functionality, cost, and overall feasibility.

Therefore, when starting a factory construction project, it’s important to consult with reputable design and construction experts to select the most suitable span solution.

Need in-depth consultation on factory span design?
Don’t hesitate to reach out to industry professionals for expert advice and tailored recommendations.

Learn more: Latest Cost Estimates for Pre-Engineered Buildings

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