Certified Residential Building Inspector
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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Question 1
What is the minimum size requirement for an under-floor access opening through
the floor to a crawl space?
A) 12 inches by 18 inches
B) 18 inches by 24 inches
C) 24 inches by 30 inches
D) 30 inches by 36 inches
Answer: B. 18 inches by 24 inches. The IRC requires under-floor access openings
through the floor to be a minimum of 18 inches by 24 inches to provide
adequate access for inspection and maintenance of crawl space areas .
Question 2
What is the minimum required bearing length for the ends of floor joists bearing
on wood or metal?
A) 1 inch
B) 1.5 inches
C) 2 inches
D) 3 inches
,Answer: B. 1.5 inches. Floor joists bearing on wood or metal must have not less
than 1.5 inches of bearing to ensure proper load transfer and structural
stability .
Question 3
Where collar ties are used to connect opposing rafters, what is the maximum
permitted spacing on center?
A) 2 feet
B) 4 feet
C) 6 feet
D) 8 feet
Answer: B. 4 feet. Collar ties used to resist wind uplift and provide roof
diaphragm continuity must not be spaced more than 4 feet on center .
Question 4
Each dwelling unit shall be provided with at least one egress door providing a
clear width of not less than:
A) 28 inches
B) 30 inches
C) 32 inches
D) 36 inches
Answer: C. 32 inches. The IRC requires at least one egress door per dwelling unit
with a minimum clear width of 32 inches to provide adequate emergency egress
and accessibility .
Question 5
,At least one under-floor ventilation opening shall be located within what distance
of an external building corner?
A) 1 foot
B) 2 feet
C) 3 feet
D) 5 feet
Answer: C. 3 feet. Ventilation openings must be located within 3 feet of each
external corner to ensure adequate cross-ventilation and prevent stagnant air
pockets in crawl spaces .
Question 6
A habitable room within a dwelling unit is required to have a floor area of no less
than:
A) 50 square feet
B) 70 square feet
C) 90 square feet
D) 120 square feet
Answer: B. 70 square feet. Habitable rooms, excluding kitchens and bathrooms,
must have a minimum floor area of 70 square feet to provide adequate living
space .
Question 7
Roof eave projections shall be limited to what maximum distance for detached
garages located within 2 feet from the lot line?
A) 12 inches
B) 18 inches
C) 24 inches
D) 36 inches
, Answer: C. 24 inches. When detached garages are located within 2 feet of the lot
line, roof eave projections are limited to 24 inches to maintain fire separation
requirements .
Question 8
One- and two-family dwellings that have separate means of egress and are no
more than how many stories in height above grade plane are subject to the IRC?
A) 2 stories
B) 3 stories
C) 4 stories
D) 5 stories
Answer: B. 3 stories. The IRC applies to one- and two-family dwellings and
townhouses not more than three stories above grade plane .
Question 9
Which of the following best describes the legal authority that allows a building
inspector to enter a dwelling without the owner's consent?
A) Fourth Amendment protection
B) Administrative search warrant
C) Police subpoena
D) Tenant lease agreement
Answer: B. Administrative search warrant. An administrative search warrant,
issued by a governing agency, permits entry for code enforcement despite the
Fourth Amendment's general protection against unreasonable searches .
Question 10
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
What is the minimum size requirement for an under-floor access opening through
the floor to a crawl space?
A) 12 inches by 18 inches
B) 18 inches by 24 inches
C) 24 inches by 30 inches
D) 30 inches by 36 inches
Answer: B. 18 inches by 24 inches. The IRC requires under-floor access openings
through the floor to be a minimum of 18 inches by 24 inches to provide
adequate access for inspection and maintenance of crawl space areas .
Question 2
What is the minimum required bearing length for the ends of floor joists bearing
on wood or metal?
A) 1 inch
B) 1.5 inches
C) 2 inches
D) 3 inches
,Answer: B. 1.5 inches. Floor joists bearing on wood or metal must have not less
than 1.5 inches of bearing to ensure proper load transfer and structural
stability .
Question 3
Where collar ties are used to connect opposing rafters, what is the maximum
permitted spacing on center?
A) 2 feet
B) 4 feet
C) 6 feet
D) 8 feet
Answer: B. 4 feet. Collar ties used to resist wind uplift and provide roof
diaphragm continuity must not be spaced more than 4 feet on center .
Question 4
Each dwelling unit shall be provided with at least one egress door providing a
clear width of not less than:
A) 28 inches
B) 30 inches
C) 32 inches
D) 36 inches
Answer: C. 32 inches. The IRC requires at least one egress door per dwelling unit
with a minimum clear width of 32 inches to provide adequate emergency egress
and accessibility .
Question 5
,At least one under-floor ventilation opening shall be located within what distance
of an external building corner?
A) 1 foot
B) 2 feet
C) 3 feet
D) 5 feet
Answer: C. 3 feet. Ventilation openings must be located within 3 feet of each
external corner to ensure adequate cross-ventilation and prevent stagnant air
pockets in crawl spaces .
Question 6
A habitable room within a dwelling unit is required to have a floor area of no less
than:
A) 50 square feet
B) 70 square feet
C) 90 square feet
D) 120 square feet
Answer: B. 70 square feet. Habitable rooms, excluding kitchens and bathrooms,
must have a minimum floor area of 70 square feet to provide adequate living
space .
Question 7
Roof eave projections shall be limited to what maximum distance for detached
garages located within 2 feet from the lot line?
A) 12 inches
B) 18 inches
C) 24 inches
D) 36 inches
, Answer: C. 24 inches. When detached garages are located within 2 feet of the lot
line, roof eave projections are limited to 24 inches to maintain fire separation
requirements .
Question 8
One- and two-family dwellings that have separate means of egress and are no
more than how many stories in height above grade plane are subject to the IRC?
A) 2 stories
B) 3 stories
C) 4 stories
D) 5 stories
Answer: B. 3 stories. The IRC applies to one- and two-family dwellings and
townhouses not more than three stories above grade plane .
Question 9
Which of the following best describes the legal authority that allows a building
inspector to enter a dwelling without the owner's consent?
A) Fourth Amendment protection
B) Administrative search warrant
C) Police subpoena
D) Tenant lease agreement
Answer: B. Administrative search warrant. An administrative search warrant,
issued by a governing agency, permits entry for code enforcement despite the
Fourth Amendment's general protection against unreasonable searches .
Question 10
