ICC B1 Residential Building Inspector Exam 2026 | Latest
Real Questions & Verified Answers | 100% Pass Guaranteed
A+
1. What is the primary purpose of a footing in residential construction?
A. To support roof loads
B. To distribute structural loads to the soil
C. To prevent water infiltration
D. To insulate the foundation
Answer: B
Footings spread the building load over a larger soil area to prevent settlement.
2. Minimum depth of footings below undisturbed ground surface is generally determined
by:
A. Soil color
B. Frost line depth
C. Building height
D. Roofing type
Answer: B
Footings must extend below frost depth to prevent heaving.
3. What type of soil has the lowest bearing capacity?
A. Gravel
B. Sand
C. Clay
D. Bedrock
Answer: C
Clay soils expand and compress, offering lower stability.
4. Anchor bolts embedded in concrete foundations must be spaced not more than:
A. 4 feet apart
B. 6 feet apart
C. 8 feet apart
D. 10 feet apart
Answer: B
IRC specifies anchor bolts at a maximum of 6 feet on center.
5. The minimum diameter of anchor bolts used in sill plates is:
A. 1/4 inch
B. 3/8 inch
C. 1/2 inch
D. 5/8 inch
Answer: C
Half-inch bolts are standard for securing sill plates.
6. What is the minimum height for crawl space clearance?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
, Answer: B
Minimum clearance ensures access and ventilation.
7. Vapor retarders in crawl spaces are installed:
A. On walls
B. Under footings
C. On the soil surface
D. On ceiling joists
Answer: C
They prevent ground moisture from entering the structure.
8. The minimum slope for drainage away from foundation is:
A. 1 inch per foot
B. 2 inches per foot
C. 6 inches within 10 feet
D. 12 inches within 10 feet
Answer: C
Proper grading prevents water accumulation near foundations.
9. Concrete gains most of its strength within:
A. 24 hours
B. 3 days
C. 7 days
D. 28 days
Answer: D
Concrete reaches design strength at 28 days.
10. What is the typical compressive strength of residential concrete?
A. 1500 psi
B. 2500 psi
C. 3000 psi
D. 5000 psi
Answer: C
3000 psi is common for residential applications.
11. Reinforcing steel in concrete is used to:
A. Reduce cost
B. Improve tensile strength
C. Speed curing
D. Prevent shrinkage
Answer: B
Steel reinforcement resists tensile forces.
12. The minimum size for access opening to crawl space is:
A. 12x12 inches
B. 16x24 inches
C. 18x24 inches
D. 24x24 inches
Answer: C
Provides adequate access for inspection and maintenance.
13. Wood in contact with concrete must be:
A. Painted
, B. Sealed
C. Pressure-treated
D. Laminated
Answer: C
Treatment protects against decay and insects.
14. Floor joists are designed to carry:
A. Only dead loads
B. Only live loads
C. Both live and dead loads
D. Wind loads only
Answer: C
Joists must support all applied loads.
15. The maximum allowable span for joists depends on:
A. Paint type
B. Wood species and grade
C. Wall color
D. Window size
Answer: B
Different species and grades have different strengths.
16. What is the function of a girder?
A. Support walls
B. Support joists
C. Insulate floors
D. Prevent moisture
Answer: B
Girders carry floor joists and transfer loads to supports.
17. Subflooring is typically made of:
A. Steel
B. Glass
C. Plywood or OSB
D. Concrete blocks
Answer: C
Engineered wood panels provide structural decking.
18. The minimum thickness for subflooring is usually:
A. 1/4 inch
B. 3/8 inch
C. 1/2 inch
D. 5/8 inch
Answer: D
Ensures structural rigidity under load.
19. What type of nail is commonly used for framing?
A. Roofing nail
B. Finish nail
C. Common nail
D. Brad nail
Real Questions & Verified Answers | 100% Pass Guaranteed
A+
1. What is the primary purpose of a footing in residential construction?
A. To support roof loads
B. To distribute structural loads to the soil
C. To prevent water infiltration
D. To insulate the foundation
Answer: B
Footings spread the building load over a larger soil area to prevent settlement.
2. Minimum depth of footings below undisturbed ground surface is generally determined
by:
A. Soil color
B. Frost line depth
C. Building height
D. Roofing type
Answer: B
Footings must extend below frost depth to prevent heaving.
3. What type of soil has the lowest bearing capacity?
A. Gravel
B. Sand
C. Clay
D. Bedrock
Answer: C
Clay soils expand and compress, offering lower stability.
4. Anchor bolts embedded in concrete foundations must be spaced not more than:
A. 4 feet apart
B. 6 feet apart
C. 8 feet apart
D. 10 feet apart
Answer: B
IRC specifies anchor bolts at a maximum of 6 feet on center.
5. The minimum diameter of anchor bolts used in sill plates is:
A. 1/4 inch
B. 3/8 inch
C. 1/2 inch
D. 5/8 inch
Answer: C
Half-inch bolts are standard for securing sill plates.
6. What is the minimum height for crawl space clearance?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
, Answer: B
Minimum clearance ensures access and ventilation.
7. Vapor retarders in crawl spaces are installed:
A. On walls
B. Under footings
C. On the soil surface
D. On ceiling joists
Answer: C
They prevent ground moisture from entering the structure.
8. The minimum slope for drainage away from foundation is:
A. 1 inch per foot
B. 2 inches per foot
C. 6 inches within 10 feet
D. 12 inches within 10 feet
Answer: C
Proper grading prevents water accumulation near foundations.
9. Concrete gains most of its strength within:
A. 24 hours
B. 3 days
C. 7 days
D. 28 days
Answer: D
Concrete reaches design strength at 28 days.
10. What is the typical compressive strength of residential concrete?
A. 1500 psi
B. 2500 psi
C. 3000 psi
D. 5000 psi
Answer: C
3000 psi is common for residential applications.
11. Reinforcing steel in concrete is used to:
A. Reduce cost
B. Improve tensile strength
C. Speed curing
D. Prevent shrinkage
Answer: B
Steel reinforcement resists tensile forces.
12. The minimum size for access opening to crawl space is:
A. 12x12 inches
B. 16x24 inches
C. 18x24 inches
D. 24x24 inches
Answer: C
Provides adequate access for inspection and maintenance.
13. Wood in contact with concrete must be:
A. Painted
, B. Sealed
C. Pressure-treated
D. Laminated
Answer: C
Treatment protects against decay and insects.
14. Floor joists are designed to carry:
A. Only dead loads
B. Only live loads
C. Both live and dead loads
D. Wind loads only
Answer: C
Joists must support all applied loads.
15. The maximum allowable span for joists depends on:
A. Paint type
B. Wood species and grade
C. Wall color
D. Window size
Answer: B
Different species and grades have different strengths.
16. What is the function of a girder?
A. Support walls
B. Support joists
C. Insulate floors
D. Prevent moisture
Answer: B
Girders carry floor joists and transfer loads to supports.
17. Subflooring is typically made of:
A. Steel
B. Glass
C. Plywood or OSB
D. Concrete blocks
Answer: C
Engineered wood panels provide structural decking.
18. The minimum thickness for subflooring is usually:
A. 1/4 inch
B. 3/8 inch
C. 1/2 inch
D. 5/8 inch
Answer: D
Ensures structural rigidity under load.
19. What type of nail is commonly used for framing?
A. Roofing nail
B. Finish nail
C. Common nail
D. Brad nail
