Michigan Building Inspector License Practice Exam Questions
With Correct Answers (Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf.
EXAM OVERVIEW
Exam Format Open Book
Administered By PSI Exams
Code Base 2021 Michigan Building Code (effective April 9, 2025, based on the 2021 IBC)
1. In a one-hour fire-resistance-rated wall, what is the maximum size permitted for
a steel electrical outlet box if two boxes are placed on opposite sides of the wall?
A. 9 square inches
B. 16 square inches
C. 4 square inches
D. 24 square inches
*Explanation: Per the 2021 Michigan Building Code (based on IBC Section 714.3.2),
metallic outlet boxes shall not exceed an area of 16 square inches unless they are
separated by a listed putty pad. However, if boxes are placed on opposite sides of the
wall (back-to-back), they must be separated by horizontal distance or be limited to a
maximum area of 4 square inches to prevent the creation of a "thru-hole" that
compromises the fire rating.*
2. For a Group R-3 (One-and-Two-Family Dwelling) detached garage, what is the
minimum required separation distance from the dwelling unit?
A. 2 feet
B. Not regulated, separation is based on wall construction type
, C. 10 feet
D. 5 feet
*Explanation: Per the 2021 Michigan Residential Code (Table R302.6), there is no specific
distance requirement for a detached garage. The required separation is determined by
the wall construction and opening protection (e.g., 1/2" gypsum board on the garage
side) rather than a property line distance, provided it is on the same lot.*
3. According to the Michigan Building Code, an interior stairway serving an
occupant load of 60 persons must have a minimum clear width of at least:
A. 36 inches
B. 48 inches
C. 44 inches
D. 32 inches
Explanation: Per 2021 MBC Section 1009.3.2, where a stairway serves an occupant load of
50 or more, the minimum clear width is 44 inches. For occupant loads of 49 or less, the
minimum width is 36 inches.
4. An inspector observes that a required handrail is 2 inches away from the wall.
Which action is required?
A. Approval, as 1.5 inches is the minimum clearance
B. Rejection, as 3 inches is the maximum clearance
C. Approval, as 2.25 inches is the minimum clearance
D. Rejection, as 4 inches is the required distance
*Explanation: Per MRC Section R311.7.8.4, the clearance between a handrail and the wall
or the surface it is attached to shall be a minimum of 1-1/2 inches (1.5"). A distance of 2
inches meets this requirement.*
5. What is the maximum allowable slope for a ramp used as part of an accessible
means of egress?
A. 1:8
, B. 1:20
C. 1:12
D. 1:4
Explanation: Per the 2021 Michigan Building Code and ICC A117.1 Standard for Accessible
and Usable Buildings and Facilities, the maximum slope for a new construction accessible
ramp is 1:12 (one unit of rise for every 12 units of run). Steeper slopes are only permitted
for existing buildings or special conditions under the Rehabilitation Code.
6. When inspecting a roof valley, what is the minimum width of metal valley
flashing required for a roof slope of 4:12?
A. 12 inches
B. 24 inches
C. 18 inches
D. 36 inches
*Explanation: Per MRC Section R905.2.8.2, valley linings shall be not less than 24 inches
wide for open valleys. While some local amendments may vary, the baseline state code
requires a minimum 24-inch width centered in the valley.*
7. An emergency escape and rescue opening (egress window) from a basement
bedroom must have a minimum net clear opening of:
A. 5.0 square feet
B. 5.7 square feet
C. 4.0 square feet
D. 6.0 square feet
*Explanation: Per MRC Section R310.2.1, the minimum net clear opening is 5.7 square
feet. The exception is for grade-floor openings which may be 5.0 square feet.*
8. A Type V-B construction building has an unsprinklered allowable area of 9,000
sq ft. If the building is fully sprinklered (NFPA 13), what is the maximum allowable
area increase?
, A. 50% increase
B. 100% increase
C. 200% increase
D. 300% increase
*Explanation: Per MBC Section 506.3.3, an automatic sprinkler system installed in
accordance with NFPA 13 allows for a 200% increase in allowable area for multi-story
buildings (and a 300% increase for single-story buildings).*
9. What is the minimum compressive strength required for concrete used in a
basement foundation wall subjected to moderate weathering?
A. 2,000 psi
B. 2,500 psi
C. 3,000 psi
D. 4,000 psi
*Explanation: Per MRC Table R402.2, concrete for basement walls, foundation walls, and
other work not exposed to the weather must have a minimum specified compressive
strength of 2,500 psi. However, for walls subjected to moderate or severe weathering
(freezing), the minimum is 3,000 psi or the use of air-entrained concrete.*
10. An inspector finds a horizontal crack in a poured concrete foundation wall.
Which of the following is the MOST significant concern?
A. Shrinkage of concrete during curing
B. Minor settlement of the footing
C. Lateral pressure from soil and potential wall failure
D. Lack of control joints
Explanation: While vertical cracks are often associated with shrinkage or settlement,
horizontal cracks (especially in the middle third of the wall height) are a red flag for
unbalanced backfill or hydrostatic pressure. This is a structural safety hazard requiring
engineering analysis per MRC Section R404.4.
With Correct Answers (Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf.
EXAM OVERVIEW
Exam Format Open Book
Administered By PSI Exams
Code Base 2021 Michigan Building Code (effective April 9, 2025, based on the 2021 IBC)
1. In a one-hour fire-resistance-rated wall, what is the maximum size permitted for
a steel electrical outlet box if two boxes are placed on opposite sides of the wall?
A. 9 square inches
B. 16 square inches
C. 4 square inches
D. 24 square inches
*Explanation: Per the 2021 Michigan Building Code (based on IBC Section 714.3.2),
metallic outlet boxes shall not exceed an area of 16 square inches unless they are
separated by a listed putty pad. However, if boxes are placed on opposite sides of the
wall (back-to-back), they must be separated by horizontal distance or be limited to a
maximum area of 4 square inches to prevent the creation of a "thru-hole" that
compromises the fire rating.*
2. For a Group R-3 (One-and-Two-Family Dwelling) detached garage, what is the
minimum required separation distance from the dwelling unit?
A. 2 feet
B. Not regulated, separation is based on wall construction type
, C. 10 feet
D. 5 feet
*Explanation: Per the 2021 Michigan Residential Code (Table R302.6), there is no specific
distance requirement for a detached garage. The required separation is determined by
the wall construction and opening protection (e.g., 1/2" gypsum board on the garage
side) rather than a property line distance, provided it is on the same lot.*
3. According to the Michigan Building Code, an interior stairway serving an
occupant load of 60 persons must have a minimum clear width of at least:
A. 36 inches
B. 48 inches
C. 44 inches
D. 32 inches
Explanation: Per 2021 MBC Section 1009.3.2, where a stairway serves an occupant load of
50 or more, the minimum clear width is 44 inches. For occupant loads of 49 or less, the
minimum width is 36 inches.
4. An inspector observes that a required handrail is 2 inches away from the wall.
Which action is required?
A. Approval, as 1.5 inches is the minimum clearance
B. Rejection, as 3 inches is the maximum clearance
C. Approval, as 2.25 inches is the minimum clearance
D. Rejection, as 4 inches is the required distance
*Explanation: Per MRC Section R311.7.8.4, the clearance between a handrail and the wall
or the surface it is attached to shall be a minimum of 1-1/2 inches (1.5"). A distance of 2
inches meets this requirement.*
5. What is the maximum allowable slope for a ramp used as part of an accessible
means of egress?
A. 1:8
, B. 1:20
C. 1:12
D. 1:4
Explanation: Per the 2021 Michigan Building Code and ICC A117.1 Standard for Accessible
and Usable Buildings and Facilities, the maximum slope for a new construction accessible
ramp is 1:12 (one unit of rise for every 12 units of run). Steeper slopes are only permitted
for existing buildings or special conditions under the Rehabilitation Code.
6. When inspecting a roof valley, what is the minimum width of metal valley
flashing required for a roof slope of 4:12?
A. 12 inches
B. 24 inches
C. 18 inches
D. 36 inches
*Explanation: Per MRC Section R905.2.8.2, valley linings shall be not less than 24 inches
wide for open valleys. While some local amendments may vary, the baseline state code
requires a minimum 24-inch width centered in the valley.*
7. An emergency escape and rescue opening (egress window) from a basement
bedroom must have a minimum net clear opening of:
A. 5.0 square feet
B. 5.7 square feet
C. 4.0 square feet
D. 6.0 square feet
*Explanation: Per MRC Section R310.2.1, the minimum net clear opening is 5.7 square
feet. The exception is for grade-floor openings which may be 5.0 square feet.*
8. A Type V-B construction building has an unsprinklered allowable area of 9,000
sq ft. If the building is fully sprinklered (NFPA 13), what is the maximum allowable
area increase?
, A. 50% increase
B. 100% increase
C. 200% increase
D. 300% increase
*Explanation: Per MBC Section 506.3.3, an automatic sprinkler system installed in
accordance with NFPA 13 allows for a 200% increase in allowable area for multi-story
buildings (and a 300% increase for single-story buildings).*
9. What is the minimum compressive strength required for concrete used in a
basement foundation wall subjected to moderate weathering?
A. 2,000 psi
B. 2,500 psi
C. 3,000 psi
D. 4,000 psi
*Explanation: Per MRC Table R402.2, concrete for basement walls, foundation walls, and
other work not exposed to the weather must have a minimum specified compressive
strength of 2,500 psi. However, for walls subjected to moderate or severe weathering
(freezing), the minimum is 3,000 psi or the use of air-entrained concrete.*
10. An inspector finds a horizontal crack in a poured concrete foundation wall.
Which of the following is the MOST significant concern?
A. Shrinkage of concrete during curing
B. Minor settlement of the footing
C. Lateral pressure from soil and potential wall failure
D. Lack of control joints
Explanation: While vertical cracks are often associated with shrinkage or settlement,
horizontal cracks (especially in the middle third of the wall height) are a red flag for
unbalanced backfill or hydrostatic pressure. This is a structural safety hazard requiring
engineering analysis per MRC Section R404.4.
