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IRC ICC Exam (International Residential Code / International Code Council)
Advanced / Mixed Difficulty | Target Audience: Building Inspectors,
Contractors, Plans Examiners, and Construction Professionals | 100% Pass
Guaranteed | Graded A+
1 According to the IRC, what is the minimum width of a hallway in a residential dwelling?
A. 30 inches
B. 32 inches
C. 34 inches
D. 36 inches
☑ Correct Answer: D
☑ Explanation: IRC Section R311.6 requires hallways to have a minimum width of 36
inches (914 mm). This ensures adequate egress and accessibility. Option A (30 inches) is too
narrow, B (32 inches) is incorrect, and C (34 inches) is also incorrect.
2 The International Residential Code (IRC) applies to one- and two-family dwellings and
townhouses with a maximum of how many stories above grade plane?
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A. 2 stories
B. 3 stories
C. 4 stories
D. 5 stories
☑ Correct Answer: B
☑ Explanation: IRC Section R101.2 states the code applies to one- and two-family
dwellings and townhouses not more than three stories above grade plane in height. Option A (2
stories) is too restrictive, C (4 stories) and D (5 stories) exceed the code's scope.
3 According to the IRC, how many smoke alarms are required in a typical residential dwelling?
A. One per floor only
B. One per floor and outside each sleeping area
C. One per floor, outside each sleeping area, and in each bedroom
D. One per 500 square feet
☑ Correct Answer: C
☑ Explanation: IRC Section R314.3 requires smoke alarms to be installed in each sleeping
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room, outside each separate sleeping area in the immediate vicinity of the bedrooms, and on
each level of the dwelling. Options A and B are incomplete, and D is not a code requirement.
4 What is the maximum allowable spacing for wall studs in a residential load-bearing wall under
the IRC?
A. 12 inches on center
B. 16 inches on center
C. 19.2 inches on center
D. 24 inches on center
☑ Correct Answer: B
☑ Explanation: IRC Section R602.3(5) specifies that wall studs in load-bearing walls shall
be spaced not more than 16 inches (406 mm) on center. Option A (12 inches) is narrower than
required, C (19.2 inches) and D (24 inches) exceed the maximum spacing.
5 According to the IRC, what is the minimum ceiling height for habitable rooms?
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A. 6 feet 8 inches
B. 7 feet
C. 7 feet 6 inches
D. 8 feet
☑ Correct Answer: B
☑ Explanation: IRC Section R305.1 requires habitable rooms to have a minimum ceiling
height of 7 feet (2134 mm). Option A (6 feet 8 inches) is the minimum for basements and
bathrooms, C (7 feet 6 inches) and D (8 feet) are not the minimum requirement.
6 What is the minimum tread depth for residential stairways under the IRC?
A. 9 inches
B. 9.5 inches
C. 10 inches
D. 11 inches
☑ Correct Answer: C
☑ Explanation: IRC Section R311.7.5.1 requires stair treads to have a minimum depth of 10
IRC ICC Exam (International Residential Code / International Code Council)
Advanced / Mixed Difficulty | Target Audience: Building Inspectors,
Contractors, Plans Examiners, and Construction Professionals | 100% Pass
Guaranteed | Graded A+
1 According to the IRC, what is the minimum width of a hallway in a residential dwelling?
A. 30 inches
B. 32 inches
C. 34 inches
D. 36 inches
☑ Correct Answer: D
☑ Explanation: IRC Section R311.6 requires hallways to have a minimum width of 36
inches (914 mm). This ensures adequate egress and accessibility. Option A (30 inches) is too
narrow, B (32 inches) is incorrect, and C (34 inches) is also incorrect.
2 The International Residential Code (IRC) applies to one- and two-family dwellings and
townhouses with a maximum of how many stories above grade plane?
,2
A. 2 stories
B. 3 stories
C. 4 stories
D. 5 stories
☑ Correct Answer: B
☑ Explanation: IRC Section R101.2 states the code applies to one- and two-family
dwellings and townhouses not more than three stories above grade plane in height. Option A (2
stories) is too restrictive, C (4 stories) and D (5 stories) exceed the code's scope.
3 According to the IRC, how many smoke alarms are required in a typical residential dwelling?
A. One per floor only
B. One per floor and outside each sleeping area
C. One per floor, outside each sleeping area, and in each bedroom
D. One per 500 square feet
☑ Correct Answer: C
☑ Explanation: IRC Section R314.3 requires smoke alarms to be installed in each sleeping
,3
room, outside each separate sleeping area in the immediate vicinity of the bedrooms, and on
each level of the dwelling. Options A and B are incomplete, and D is not a code requirement.
4 What is the maximum allowable spacing for wall studs in a residential load-bearing wall under
the IRC?
A. 12 inches on center
B. 16 inches on center
C. 19.2 inches on center
D. 24 inches on center
☑ Correct Answer: B
☑ Explanation: IRC Section R602.3(5) specifies that wall studs in load-bearing walls shall
be spaced not more than 16 inches (406 mm) on center. Option A (12 inches) is narrower than
required, C (19.2 inches) and D (24 inches) exceed the maximum spacing.
5 According to the IRC, what is the minimum ceiling height for habitable rooms?
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A. 6 feet 8 inches
B. 7 feet
C. 7 feet 6 inches
D. 8 feet
☑ Correct Answer: B
☑ Explanation: IRC Section R305.1 requires habitable rooms to have a minimum ceiling
height of 7 feet (2134 mm). Option A (6 feet 8 inches) is the minimum for basements and
bathrooms, C (7 feet 6 inches) and D (8 feet) are not the minimum requirement.
6 What is the minimum tread depth for residential stairways under the IRC?
A. 9 inches
B. 9.5 inches
C. 10 inches
D. 11 inches
☑ Correct Answer: C
☑ Explanation: IRC Section R311.7.5.1 requires stair treads to have a minimum depth of 10
