ICC Commercial Building Inspector Practice Test

What is the minimum uniformly distributed live load for an office building's lobby floor?

1. 50 psf

2. 75 psf

3. 100 psf

4. 150 psf

The correct answer is: 100 psf

The minimum uniformly distributed live load for an office building's lobby floor is typically set at 100 pounds per square foot (psf). This requirement stems from building codes and standards that account for the intended use of the space, anticipating higher concentrations of foot traffic and transient loads in areas such as lobbies. Lobbies often serve various functions, such as waiting areas, social interaction spaces, or access points to other parts of the building, which can create an environment with fluctuating occupancy levels. Consequently, designing for 100 psf ensures that the floor can safely accommodate both people and potential movable furniture or equipment without risking structural integrity. Other values listed, such as 50 psf, 75 psf, or 150 psf, do not align with the established requirements for lobby spaces in office buildings. The lower values do not provide sufficient capacity for the anticipated loads, while a value of 150 psf could be excessive for typical lobby use and may lead to unnecessary costs in material and design specifications. Thus, the selected value reflects a balance between safety and practicality in lobby floor design.