National baseline
NBC Part 4 Table provides minimum floor live loads by use category. Part 9 references simplified values for housing and small buildings.
Canadian building code question
What are the building code requirements for floor live loads in Canada?
The NBC specifies minimum uniformly distributed live loads and concentrated loads for floors based on the intended use or occupancy of the space. Values range from residential floor loads to assembly, storage, and industrial loads. Part 4 covers engineered requirements; Part 9 provides simplified values for housing.
Floor live loads are a fundamental structural design input that depends entirely on the intended use of each space. Using the wrong live load value can result in under-designed floors or unnecessarily expensive construction. The code provides tables of minimum values by use category, and these values are mandatory minimums — not suggestions.
What to check first
- Minimum live load values are specified by use or occupancy type, not by building classification alone.
- Both uniformly distributed loads and concentrated point loads must be considered for each floor area.
- Corridors, lobbies, and exit paths often have higher live load requirements than the adjacent occupied spaces.
Jurisdiction notes
Province and edition check
Live load tables are generally consistent across provinces, but confirm the adopted NBC edition as values may have been updated.
Special loading conditions
Storage, mechanical rooms, parking, and assembly occupancies may require higher live loads than the general table values.
Work through it in this order
- Identify the intended use for each floor area and match it to the NBC live load table category.
- Look up both the uniformly distributed load and the concentrated load for each use category.
- Verify corridor, lobby, and exit path live load requirements separately from adjacent spaces.
- Check whether any special loading conditions apply (storage, mechanical equipment, assembly seating).
Common questions
What is the minimum floor live load for an office?
The NBC specifies minimum live loads for office use in the floor load table. The exact value depends on the code edition. Verify the cited provision for your project.
Do residential floors have a lower live load requirement?
Yes. Residential living areas generally have a lower minimum live load than commercial, assembly, or storage uses. However, specific areas like balconies may have higher requirements.
What live load applies to a roof used as a terrace?
Roofs used as terraces, assembly areas, or occupiable spaces must be designed for the live load corresponding to the intended use, not the standard roof load.