The fire-resistance rating requirements for different building elements in Type IV (Heavy Timber) construction are specified in the 2021 International Building Code (IBC), Table 601 - Fire-Resistance Rating Requirements for Building Elements (Hours).
IBC Table 601 - Fire Resistance for Type IV Construction:
Interior nonbearing walls and partitions in Type IV construction require 0 hours of fire resistance.
This is because Type IV construction primarily relies on large, heavy timber elements that provide inherent fire resistance.
Why Other Options Are Incorrect?
B: 1 hour - Incorrect, as nonbearing interior walls in Type IV construction are not required to have a fire- resistance rating.
C: 1-1/2 hours - Not required by code.
D: 2 hours - Only structural elements like exterior walls in some cases may require fire resistance, but nonbearing interior partitions do not.