ICC B1 Residential Building Inspector
Exam Practice Questions And Correct
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Rationales 2026 Q&A | Instant
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1. Which section of the International Residential Code primarily regulates
one- and two-family dwellings?
A. International Building Code
B. International Plumbing Code
C. International Residential Code
D. International Fire Code
C. International Residential Code
The International Residential Code (IRC) specifically governs the
construction, alteration, and repair of one- and two-family dwellings and
townhouses not more than three stories above grade plane.
, 2. What is the minimum uniformly distributed live load for sleeping
rooms in residential construction?
A. 20 psf
B. 30 psf
C. 40 psf
D. 50 psf
B. 30 psf
The IRC requires sleeping rooms to be designed for a minimum live load of
30 pounds per square foot to safely support occupants and furnishings.
3. What is the minimum ceiling height required for habitable spaces?
A. 6 feet 8 inches
B. 7 feet
C. 7 feet 6 inches
D. 8 feet
B. 7 feet
Habitable spaces, hallways, bathrooms, and portions of basements must
generally have a ceiling height of not less than 7 feet according to the IRC.
4. Which type of soil generally has the lowest load-bearing capacity?
A. Gravel
B. Sand
, C. Clay
D. Bedrock
C. Clay
Clay soils tend to expand and contract with moisture changes and often
provide lower bearing capacities than gravel, sand, or bedrock.
5. What is the minimum width of an egress door in a dwelling unit?
A. 28 inches
B. 30 inches
C. 32 inches
D. 36 inches
C. 32 inches
The IRC requires at least one egress door to provide a minimum clear width
of 32 inches for safe occupant exit.
6. Which fastening method is commonly required for attaching sill plates
to concrete foundations?
A. Drywall screws
B. Roofing nails
C. Anchor bolts
D. Adhesive only
C. Anchor bolts
, Anchor bolts securely connect sill plates to concrete foundations and help
resist uplift and lateral movement from wind or seismic forces.
7. What is the minimum tread depth for residential stairs?
A. 9 inches
B. 10 inches
C. 11 inches
D. 12 inches
B. 10 inches
Residential stair treads must have a minimum depth of 10 inches to
provide safe footing for occupants.
8. What is the maximum riser height permitted for residential stairs?
A. 7 inches
B. 7¾ inches
C. 8 inches
D. 8¼ inches
B. 7¾ inches
The IRC limits stair risers to a maximum height of 7¾ inches to reduce fall
hazards and maintain consistent stair geometry.
9. What is the primary purpose of flashing installed around windows?
A. Improve insulation
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which section of the International Residential Code primarily regulates
one- and two-family dwellings?
A. International Building Code
B. International Plumbing Code
C. International Residential Code
D. International Fire Code
C. International Residential Code
The International Residential Code (IRC) specifically governs the
construction, alteration, and repair of one- and two-family dwellings and
townhouses not more than three stories above grade plane.
, 2. What is the minimum uniformly distributed live load for sleeping
rooms in residential construction?
A. 20 psf
B. 30 psf
C. 40 psf
D. 50 psf
B. 30 psf
The IRC requires sleeping rooms to be designed for a minimum live load of
30 pounds per square foot to safely support occupants and furnishings.
3. What is the minimum ceiling height required for habitable spaces?
A. 6 feet 8 inches
B. 7 feet
C. 7 feet 6 inches
D. 8 feet
B. 7 feet
Habitable spaces, hallways, bathrooms, and portions of basements must
generally have a ceiling height of not less than 7 feet according to the IRC.
4. Which type of soil generally has the lowest load-bearing capacity?
A. Gravel
B. Sand
, C. Clay
D. Bedrock
C. Clay
Clay soils tend to expand and contract with moisture changes and often
provide lower bearing capacities than gravel, sand, or bedrock.
5. What is the minimum width of an egress door in a dwelling unit?
A. 28 inches
B. 30 inches
C. 32 inches
D. 36 inches
C. 32 inches
The IRC requires at least one egress door to provide a minimum clear width
of 32 inches for safe occupant exit.
6. Which fastening method is commonly required for attaching sill plates
to concrete foundations?
A. Drywall screws
B. Roofing nails
C. Anchor bolts
D. Adhesive only
C. Anchor bolts
, Anchor bolts securely connect sill plates to concrete foundations and help
resist uplift and lateral movement from wind or seismic forces.
7. What is the minimum tread depth for residential stairs?
A. 9 inches
B. 10 inches
C. 11 inches
D. 12 inches
B. 10 inches
Residential stair treads must have a minimum depth of 10 inches to
provide safe footing for occupants.
8. What is the maximum riser height permitted for residential stairs?
A. 7 inches
B. 7¾ inches
C. 8 inches
D. 8¼ inches
B. 7¾ inches
The IRC limits stair risers to a maximum height of 7¾ inches to reduce fall
hazards and maintain consistent stair geometry.
9. What is the primary purpose of flashing installed around windows?
A. Improve insulation
