Commercial Building Inspector B2Floor ConstructionEasy
A commercial building inspector is reviewing plans for a new three-story office building of Type IIA construction. The plans show a floor assembly with a 1-hour fire-resistance rating. What is the minimum fire-resistance rating required for the floor construction (including beams, girders, and trusses) in this building type, according to the IBC?
- A1.5 hours
- B2 hours
- C0 hours
- D1 hour
Show answer & explanationAnswer & explanation
Correct answer: D. 1 hour
According to IBC Table 601, for Type IIA construction, floor construction (including beams, girders, and trusses) is required to have a minimum 1-hour fire-resistance rating.
Why the other options are wrong
- A. 1.5 hours is not a standard fire-resistance rating specified in IBC Table 601 for floor construction.
- B. 2 hours is typically required for Type IB construction floors or higher-rated elements in Type IIA.
- C. 0 hours is for Type IIB construction, which has no fire-resistance rating requirement for structural elements.
Type IIA Fire Rating
Type IIA construction is a noncombustible construction type where structural elements, including floors, are required to have a 1-hour fire-resistance rating.
- Noncombustible construction.
- Floor assemblies require 1-hour rating.
- Bearing walls and structural frames also require 1-hour rating.
- Less fire-resistive than Type IB.
Memory trick: Building types determine fire's might, check the table for your code's light.