Section 1607.1/Live Loads
IBC 1607 covers minimum live loads by occupancy type referencing ASCE 7 Table 4.3-1, including corridor and partition loads.
Buildings must be designed for the minimum live loads specified in ASCE 7 Table 4.3-1 as referenced by IBC Section 1607. Typical values include 50 psf for offices, 40 psf for residential, 100 psf for assembly areas with fixed seating, 60 psf for corridors above the first floor, and 100 psf for first-floor corridors in public assembly buildings. In addition to uniformly distributed loads, concentrated loads must be checked (2,000 pounds over a 2.5-foot square for office floors). The structural design must account for the most critical loading pattern: full load on all spans, or partial loading that produces the maximum effect.
Why this section exists
Live loads represent the weight of people, furniture, equipment, and movable contents in a building. These loads vary by use: an office has lighter loads than a library or a warehouse. The minimum live loads in the code represent the maximum loads reasonably expected for each occupancy type based on surveys and statistical analysis. Under- designing for live load can cause deflection, cracking, and in extreme cases structural failure. The values include a safety margin but are not arbitrary; they are calibrated to actual measured loads in buildings of each type.
What plan reviewers look for
Plan reviewers check the structural general notes for the design live loads used for each occupancy type. They verify the values match ASCE 7 Table 4.3-1 for the correct occupancy. They check that corridors, stairs, and assembly areas use the correct (often higher) live loads. They verify that roof live loads are included for maintenance access. They check that partition loads (15 psf minimum for offices) are added where applicable.