ICC Residential Combination Inspector
(B1 + Residential Modules) Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which code is primarily used for one- and two-family dwellings in ICC
residential inspections?
A) IBC
B) IECC
C) IRC
D) IFC
Answer: C
Rationale: The International Residential Code (IRC) governs
construction of one- and two-family dwellings and townhouses.
2. What is the minimum frost depth protection requirement based on?
A) Roof load
B) Local climate conditions
, C) Wall height
D) Occupancy type
Answer: B
Rationale: Frost depth is determined by local climate and
jurisdictional requirements to prevent heaving.
3. Footings are primarily designed to:
A) Anchor roof systems
B) Transfer building loads to soil
C) Prevent fire spread
D) Support insulation
Answer: B
Rationale: Footings distribute structural loads safely into the soil
below.
4. What is the minimum width for a residential stairway?
A) 28 inches
B) 30 inches
C) 36 inches
D) 42 inches
Answer: C
Rationale: Residential stairways must have a minimum width of 36
inches for safe passage.
,5. The minimum headroom in a stairway is typically:
A) 6 feet 4 inches
B) 6 feet 6 inches
C) 6 feet 8 inches
D) 7 feet
Answer: C
Rationale: IRC requires at least 6 feet 8 inches of headroom above
stair treads.
6. What is the maximum riser height allowed in residential stairs?
A) 7 3/4 inches
B) 8 inches
C) 8 1/4 inches
D) 9 inches
Answer: A
Rationale: Maximum riser height is 7 3/4 inches for uniform stair
safety.
7. Minimum tread depth in residential stairs is:
A) 9 inches
B) 9 1/4 inches
C) 10 inches
D) 10 1/4 inches
Answer: C
, Rationale: Treads must be at least 10 inches deep to provide stable
footing.
8. Handrails must be installed when there are more than how many
risers?
A) 2
B) 3
C) 4
D) 5
Answer: B
Rationale: Handrails are required for stairs with four or more risers
(more than three).
9. Minimum ceiling height for habitable rooms is:
A) 6 ft 8 in
B) 7 ft
C) 7 ft 6 in
D) 8 ft
Answer: B
Rationale: IRC requires a minimum ceiling height of 7 feet for
habitable spaces.
10. Which soil condition most affects foundation design?
A) Color
B) Density and bearing capacity
(B1 + Residential Modules) Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which code is primarily used for one- and two-family dwellings in ICC
residential inspections?
A) IBC
B) IECC
C) IRC
D) IFC
Answer: C
Rationale: The International Residential Code (IRC) governs
construction of one- and two-family dwellings and townhouses.
2. What is the minimum frost depth protection requirement based on?
A) Roof load
B) Local climate conditions
, C) Wall height
D) Occupancy type
Answer: B
Rationale: Frost depth is determined by local climate and
jurisdictional requirements to prevent heaving.
3. Footings are primarily designed to:
A) Anchor roof systems
B) Transfer building loads to soil
C) Prevent fire spread
D) Support insulation
Answer: B
Rationale: Footings distribute structural loads safely into the soil
below.
4. What is the minimum width for a residential stairway?
A) 28 inches
B) 30 inches
C) 36 inches
D) 42 inches
Answer: C
Rationale: Residential stairways must have a minimum width of 36
inches for safe passage.
,5. The minimum headroom in a stairway is typically:
A) 6 feet 4 inches
B) 6 feet 6 inches
C) 6 feet 8 inches
D) 7 feet
Answer: C
Rationale: IRC requires at least 6 feet 8 inches of headroom above
stair treads.
6. What is the maximum riser height allowed in residential stairs?
A) 7 3/4 inches
B) 8 inches
C) 8 1/4 inches
D) 9 inches
Answer: A
Rationale: Maximum riser height is 7 3/4 inches for uniform stair
safety.
7. Minimum tread depth in residential stairs is:
A) 9 inches
B) 9 1/4 inches
C) 10 inches
D) 10 1/4 inches
Answer: C
, Rationale: Treads must be at least 10 inches deep to provide stable
footing.
8. Handrails must be installed when there are more than how many
risers?
A) 2
B) 3
C) 4
D) 5
Answer: B
Rationale: Handrails are required for stairs with four or more risers
(more than three).
9. Minimum ceiling height for habitable rooms is:
A) 6 ft 8 in
B) 7 ft
C) 7 ft 6 in
D) 8 ft
Answer: B
Rationale: IRC requires a minimum ceiling height of 7 feet for
habitable spaces.
10. Which soil condition most affects foundation design?
A) Color
B) Density and bearing capacity
