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IRC TEST FULL EXAM ACTUAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS 2025-2026) |ALREADY
GRADED A+||GUARANTEE PASS
1.
Which section of the IRC primarily addresses building planning
requirements?
a) Chapter 2
b) Chapter 3 (Correct Answer)
c) Chapter 4
d) Chapter 6
Rationale: Chapter 3 of the International Residential Code (IRC) outlines
Building Planning, including ceiling height, room dimensions, and
light/ventilation.
2.
According to IRC, what is the minimum ceiling height for habitable rooms?
a) 6 ft 6 in
b) 7 ft (Correct Answer)
c) 7 ft 6 in
d) 8 ft
Rationale: The IRC requires a minimum ceiling height of 7 feet in
habitable rooms (exceptions apply for bathrooms, kitchens, and basements).
3.
Which type of footing is typically required for load-bearing walls in
residential construction?
a) Continuous footing (Correct Answer)
b) Isolated footing
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c) Pad footing
d) Raft foundation
Rationale: IRC specifies continuous concrete footings under load-bearing
walls for proper weight distribution.
4.
What is the maximum allowable riser height for residential stairs under IRC?
a) 7 inches
b) 7 ¾ inches (Correct Answer)
c) 8 inches
d) 8 ½ inches
Rationale: Stair risers in residential construction must not exceed 7 ¾
inches, ensuring safety and uniformity.
5.
What is the minimum tread depth required for residential stairs?
a) 9 inches
b) 10 inches (Correct Answer)
c) 10 ½ inches
d) 11 inches
Rationale: IRC requires minimum 10-inch tread depth to reduce fall risks.
6.
Which IRC section governs fire-resistant construction?
a) Chapter 1
b) Chapter 3
c) Chapter 6
d) Chapter 3, Section R302 (Correct Answer)
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Rationale: Fire-resistant construction standards, including wall separation
and fire blocking, are detailed in R302.
7.
Guardrails are required on open-sided walking surfaces located more than
how many inches above the floor/grade?
a) 24 inches
b) 30 inches (Correct Answer)
c) 36 inches
d) 42 inches
Rationale: IRC requires guardrails at 30 inches or higher to prevent falls.
8.
What is the minimum height of guardrails required by IRC?
a) 30 inches
b) 34 inches
c) 36 inches (Correct Answer)
d) 42 inches
Rationale: Guardrails must be at least 36 inches high in residential
occupancies.
9.
What is the maximum spacing for balusters (guard openings) to prevent a 4-
inch sphere from passing through?
a) 3 inches
b) 3 ½ inches
c) 4 inches (Correct Answer)
d) 4 ½ inches
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Rationale: Baluster spacing is limited so that a 4-inch sphere cannot pass,
ensuring child safety.
10.
What is the maximum rise allowed for a flight of stairs before requiring a
landing?
a) 10 ft
b) 12 ft (Correct Answer)
c) 14 ft
d) 16 ft
Rationale: IRC specifies that a landing is required if the stair rise exceeds
12 feet.
11.
Egress doors in residences must provide a minimum clear width of:
a) 28 inches
b) 30 inches
c) 32 inches (Correct Answer)
d) 34 inches
Rationale: The IRC mandates 32-inch minimum clear width for the main
egress door.
12.
Which rooms are required to have emergency escape and rescue openings?
a) All habitable rooms
b) Kitchens and living rooms
c) Basements and sleeping rooms (Correct Answer)
d) Bathrooms only
IRC TEST FULL EXAM ACTUAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS 2025-2026) |ALREADY
GRADED A+||GUARANTEE PASS
1.
Which section of the IRC primarily addresses building planning
requirements?
a) Chapter 2
b) Chapter 3 (Correct Answer)
c) Chapter 4
d) Chapter 6
Rationale: Chapter 3 of the International Residential Code (IRC) outlines
Building Planning, including ceiling height, room dimensions, and
light/ventilation.
2.
According to IRC, what is the minimum ceiling height for habitable rooms?
a) 6 ft 6 in
b) 7 ft (Correct Answer)
c) 7 ft 6 in
d) 8 ft
Rationale: The IRC requires a minimum ceiling height of 7 feet in
habitable rooms (exceptions apply for bathrooms, kitchens, and basements).
3.
Which type of footing is typically required for load-bearing walls in
residential construction?
a) Continuous footing (Correct Answer)
b) Isolated footing
,2|Page
c) Pad footing
d) Raft foundation
Rationale: IRC specifies continuous concrete footings under load-bearing
walls for proper weight distribution.
4.
What is the maximum allowable riser height for residential stairs under IRC?
a) 7 inches
b) 7 ¾ inches (Correct Answer)
c) 8 inches
d) 8 ½ inches
Rationale: Stair risers in residential construction must not exceed 7 ¾
inches, ensuring safety and uniformity.
5.
What is the minimum tread depth required for residential stairs?
a) 9 inches
b) 10 inches (Correct Answer)
c) 10 ½ inches
d) 11 inches
Rationale: IRC requires minimum 10-inch tread depth to reduce fall risks.
6.
Which IRC section governs fire-resistant construction?
a) Chapter 1
b) Chapter 3
c) Chapter 6
d) Chapter 3, Section R302 (Correct Answer)
,3|Page
Rationale: Fire-resistant construction standards, including wall separation
and fire blocking, are detailed in R302.
7.
Guardrails are required on open-sided walking surfaces located more than
how many inches above the floor/grade?
a) 24 inches
b) 30 inches (Correct Answer)
c) 36 inches
d) 42 inches
Rationale: IRC requires guardrails at 30 inches or higher to prevent falls.
8.
What is the minimum height of guardrails required by IRC?
a) 30 inches
b) 34 inches
c) 36 inches (Correct Answer)
d) 42 inches
Rationale: Guardrails must be at least 36 inches high in residential
occupancies.
9.
What is the maximum spacing for balusters (guard openings) to prevent a 4-
inch sphere from passing through?
a) 3 inches
b) 3 ½ inches
c) 4 inches (Correct Answer)
d) 4 ½ inches
, 4|Page
Rationale: Baluster spacing is limited so that a 4-inch sphere cannot pass,
ensuring child safety.
10.
What is the maximum rise allowed for a flight of stairs before requiring a
landing?
a) 10 ft
b) 12 ft (Correct Answer)
c) 14 ft
d) 16 ft
Rationale: IRC specifies that a landing is required if the stair rise exceeds
12 feet.
11.
Egress doors in residences must provide a minimum clear width of:
a) 28 inches
b) 30 inches
c) 32 inches (Correct Answer)
d) 34 inches
Rationale: The IRC mandates 32-inch minimum clear width for the main
egress door.
12.
Which rooms are required to have emergency escape and rescue openings?
a) All habitable rooms
b) Kitchens and living rooms
c) Basements and sleeping rooms (Correct Answer)
d) Bathrooms only
