Published by Metal Building Resources as general planning guidance, not a project-specific engineering design, code determination, or binding price quote. No individual expert review is claimed. Confirm requirements with your local building department and qualified design professionals.
The foundation must be designed for the actual building reactions, soil conditions, and intended use. A floor slab is not automatically an adequate structural foundation. IBC Chapter 18 sets out soil investigation and foundation design provisions [1]; confirm the code adopted at your site.
Concrete Slab
A slab provides a floor surface. Depending on the engineered design, column loads may be supported by separate footings, thickened areas, or another foundation system. Do not select slab thickness or reinforcement from a generic range: have the design professional account for building and floor loads, soil, and construction details [1].
Pier Foundation
Individual supports at column locations may be considered where a continuous floor is unnecessary. Ask your engineer about uplift, lateral resistance, bearing, settlement, and connections. Cost depends on the designed system and local construction conditions; piers are not always cheaper.
Perimeter Footing
A continuous perimeter footing may be part of a designed foundation system. Discuss interior column supports, floor plans, drainage, and future work with the engineer rather than assuming a perimeter footing supports every configuration.
Soil Considerations
IBC Section 1803 addresses conditions such as questionable bearing soils, expansive soils, groundwater, and certain seismic hazards [1]. A registered design professional determines the investigation scope. Building width alone is not a universal test requirement, and any permitted waiver must be confirmed with the building official.
Coordinate With Your Building Manufacturer
Provide the foundation engineer with the manufacturer's column reactions and anchor layout. Confirm compatibility before concrete placement, and follow the approved drawings and inspection requirements. This overview is not a foundation design or construction specification.
Sources
- 1 — International Code Council: 2024 IBC, Chapter 18, Soils and Foundations — Sections 1803 (investigations), 1808 (design), and 1809–1810 (foundation provisions). Local adoption and amendments control.