Question 7
Domain 6: Code Administration and Inspection ProceduresAccording to the IRC, what is the scope of the code — which buildings does it regulate?
Correct answer: B
Explanation
The IRC applies to "detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height," which defines its scope. That language limits the code to those residential buildings and excludes taller structures and other occupancy types.
Why each option is right or wrong
A. All residential and commercial buildings
B. Detached one- and two-family dwellings and townhouses up to three stories
IRC Section R101.2 defines the scope of the code as detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height, with a separate allowance for their accessory structures. That means the code applies to low-rise residential buildings of that type only, and it does not extend to taller buildings or other occupancy classifications.
C. Only single-family homes
D. All buildings under four stories