Residential Building Contractor Exam
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
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1. What is the maximum riser height allowed by the International
Residential Code (IRC) for stairs in a residential building?
a) 7 ¾ inches
b) 8 ¼ inches
c) 7 ¾ inches
d) 8 inches
The IRC specifies that stair risers shall not exceed 7 ¾ inches for safety
and comfort.
2. What is the minimum tread depth for residential stairs according to
IRC?
, a) 9 inches
b) 10 inches
c) 11 inches
d) 12 inches
The IRC requires stair treads to be at least 10 inches deep to ensure
safe footing.
3. What is the minimum ceiling height required in habitable rooms of a
residential dwelling?
a) 6 feet 8 inches
b) 7 feet
c) 7 feet 6 inches
d) 8 feet
The IRC requires a minimum of 7 feet ceiling height for habitable
rooms to ensure adequate space and ventilation.
4. What is the minimum width of a residential hallway?
a) 30 inches
b) 36 inches
c) 32 inches
d) 34 inches
The IRC mandates a 36-inch minimum hallway width for accessibility
and safe passage.
5. What is the maximum spacing allowed between balusters in a
residential guardrail?
, a) 3 ½ inches
b) 5 inches
c) 4 inches
d) 6 inches
The 4-inch rule prevents small children from passing through the
guardrail opening.
6. What is the minimum required live load for residential bedrooms?
a) 20 psf
b) 30 psf
c) 40 psf
d) 50 psf
The IRC requires a live load of 30 psf for bedrooms to account for
occupants and furnishings.
7. What is the minimum required live load for residential living rooms
and other habitable spaces?
a) 30 psf
b) 40 psf
c) 50 psf
d) 60 psf
Living areas must be designed for 40 psf live load to ensure safety
under normal occupancy.
8. What is the minimum slope required for a residential roof?
a) 1/12
, b) 2/12
c) 3/12
d) 4/12
Most roofing materials require at least a 2/12 slope to shed water
properly.
9. What is the minimum height for guardrails on decks more than 30
inches above grade?
a) 30 inches
b) 34 inches
c) 36 inches
d) 42 inches
The IRC requires guardrails at least 36 inches high for safety on
elevated surfaces.
10. What is the minimum clear width of a residential doorway?
a) 28 inches
b) 30 inches
c) 32 inches
d) 36 inches
The IRC requires at least 32 inches of clear opening width for doors to
allow safe passage.
11. What is the maximum spacing of wall studs in exterior walls for
one-story residential construction using 2x4 studs?
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
Download Pdf
1. What is the maximum riser height allowed by the International
Residential Code (IRC) for stairs in a residential building?
a) 7 ¾ inches
b) 8 ¼ inches
c) 7 ¾ inches
d) 8 inches
The IRC specifies that stair risers shall not exceed 7 ¾ inches for safety
and comfort.
2. What is the minimum tread depth for residential stairs according to
IRC?
, a) 9 inches
b) 10 inches
c) 11 inches
d) 12 inches
The IRC requires stair treads to be at least 10 inches deep to ensure
safe footing.
3. What is the minimum ceiling height required in habitable rooms of a
residential dwelling?
a) 6 feet 8 inches
b) 7 feet
c) 7 feet 6 inches
d) 8 feet
The IRC requires a minimum of 7 feet ceiling height for habitable
rooms to ensure adequate space and ventilation.
4. What is the minimum width of a residential hallway?
a) 30 inches
b) 36 inches
c) 32 inches
d) 34 inches
The IRC mandates a 36-inch minimum hallway width for accessibility
and safe passage.
5. What is the maximum spacing allowed between balusters in a
residential guardrail?
, a) 3 ½ inches
b) 5 inches
c) 4 inches
d) 6 inches
The 4-inch rule prevents small children from passing through the
guardrail opening.
6. What is the minimum required live load for residential bedrooms?
a) 20 psf
b) 30 psf
c) 40 psf
d) 50 psf
The IRC requires a live load of 30 psf for bedrooms to account for
occupants and furnishings.
7. What is the minimum required live load for residential living rooms
and other habitable spaces?
a) 30 psf
b) 40 psf
c) 50 psf
d) 60 psf
Living areas must be designed for 40 psf live load to ensure safety
under normal occupancy.
8. What is the minimum slope required for a residential roof?
a) 1/12
, b) 2/12
c) 3/12
d) 4/12
Most roofing materials require at least a 2/12 slope to shed water
properly.
9. What is the minimum height for guardrails on decks more than 30
inches above grade?
a) 30 inches
b) 34 inches
c) 36 inches
d) 42 inches
The IRC requires guardrails at least 36 inches high for safety on
elevated surfaces.
10. What is the minimum clear width of a residential doorway?
a) 28 inches
b) 30 inches
c) 32 inches
d) 36 inches
The IRC requires at least 32 inches of clear opening width for doors to
allow safe passage.
11. What is the maximum spacing of wall studs in exterior walls for
one-story residential construction using 2x4 studs?
