One of the biggest choices in a steel building design is how the frame spans the width. You can choose a clear-span metal building with no interior columns, or a multi-span building with one or more rows of columns inside. Each option has real advantages.
What Is a Clear-Span Metal Building?
A clear-span frame reaches from one sidewall to the other without any interior supports. As a result, the entire floor stays open. You can move equipment, lay out racks or ride horses anywhere in the building.
Clear-span frames work well for riding arenas, aircraft hangars, gyms, equipment storage and shops. However, wider spans need deeper, heavier frames to carry the roof loads.
What Is a Multi-Span Building?
A multi-span building, also called a modular frame, uses interior columns to support the roof. Because the frames span shorter distances, they can use lighter steel. Therefore, multi-span designs often cost less for very wide buildings.
They suit warehouses, distribution centers and manufacturing spaces where a few columns don’t interfere with operations.
Clear-Span Metal Building Pros and Cons
Pros:
- Completely open floor space
- Flexible layout that is easy to change later
- No columns to work around with vehicles or equipment
Cons:
- Heavier frames as the width grows
- Higher cost for very wide buildings
- Taller frame members at the haunch, which can affect clearances
Multi-Span Pros and Cons
Pros: lighter frames, lower steel cost for wide buildings and efficient designs for large footprints.
Cons: interior columns limit layout, and you need to plan aisles, racks and doors around them.
How to Choose a Clear-Span Metal Building or Multi-Span
Start with how you will use the floor. If you need total flexibility, choose clear span. On the other hand, if you are building very wide and can place columns along aisles or walls, multi-span may save money.
Snow loads matter too. Heavy snow increases frame size, and that effect grows with width. Our guide to metal building snow loads explains why. For cost factors in general, see what affects metal building cost.
Plan for the Future
Finally, think about how your needs might change. A clear-span building leaves the most room to change the layout later. In addition, both types can often grow with added bays. Our article on whether to expand or build new covers that topic.
For more technical background, the American Institute of Steel Construction and the Metal Building Manufacturers Association are helpful resources.
Talk to Maine Metal Buildings
Not sure which frame fits your project? Tell us how you will use the space and we will help you compare options. Our team typically responds within 24 hours, and detailed quotes are usually ready within 7–10 business days. Contact us or call (207) 591-0196 to start your project.
