Ohio Home Inspector Exam 2026 – 190 Practice Questions with
Answers & Detailed Rationales, Structural Systems, Roofing,
Electrical, HVAC, Plumbing & Ohio Regulations
Part 1: Structural Systems & Foundations (Questions 1–25)
Question 1
While inspecting a two-story house, you find a horizontal crack in the foundation wall
approximately 3/8 inch wide, with slight inward bowing. What is the most likely cause?
A. Normal concrete shrinkage
B. Surface cracking from thermal expansion
C. Lateral soil pressure or frost heave pushing against the foundation
D. Uneven settlement from insufficient footing thickness
Correct Answer: C
Explanation: A horizontal crack with inward bowing is classic evidence of lateral soil pressure
or frost heave. Vertical or diagonal cracks more commonly indicate settlement.
Question 2
In a crawlspace, you see a 6×6 wood post resting directly on a 4-inch concrete pad,
supporting the main beam above. What is the primary defect with this installation?
A. The wood post is not pressure-treated
B. The post lacks a metal connector at the beam above
C. The concrete pad is too thin
D. The post cross-section is undersized
,Correct Answer: B
Explanation: A post merely resting under a beam without a metal cap or bracket cannot
resist lateral displacement. This is a structural connection defect more critical than pad
thickness or wood preservation.
Question 3
You observe a white powdery deposit on the foundation wall in a 1950s crawlspace, with
dampness present. What is the most accurate description of this phenomenon?
A. Mold growth
B. Efflorescence
C. Concrete carbonation
D. Termite damage
Correct Answer: B
Explanation: Efflorescence is a white deposit left when water carries salts through masonry
and evaporates on the surface. It indicates moisture migration, not mold or insect activity.
Question 4
While inspecting a new house, you find a hairline crack less than 1/16 inch wide in the
concrete floor, with no displacement. What is the most appropriate report wording?
A. Structural foundation defect; recommend immediate evaluation
B. Shrinkage crack, a normal part of concrete curing
C. Early sign of freeze-thaw damage
D. Clear evidence of foundation settlement
,Correct Answer: B
Explanation: Fine cracks without displacement are typically shrinkage cracks from concrete
curing and are normal. Inspectors should describe findings without exaggerating.
Question 5
A brick exterior wall extends directly to soil contact with no damp-proof course visible. What
problem is this condition most likely to cause?
A. Freeze-thaw spalling of brick
B. Capillary rise of moisture
C. Thermal expansion of mortar joints
D. Structural wall instability
Correct Answer: B
Explanation: When brick contacts soil without a damp-proof course, water migrates upward
by capillary action, causing wall dampness, efflorescence, and interior damage.
Question 6
During an inspection, you find a floor joist notched approximately one-third of its depth to
accommodate a pipe. What is the most accurate description in your report?
A. This is a common plumbing practice and needs no comment
B. The joist cross-section is reduced, affecting load capacity
C. Acceptable if the remaining wood is dry
D. Check whether the joist has a metal reinforcement plate
Correct Answer: B
, Explanation: Notching a joist significantly reduces its structural capacity, especially in the
tension zone at the bottom edge. Inspectors should report this defect.
Question 7
A concrete foundation wall has a stair-step crack about 1/8 inch wide extending downward
from a window corner. What is the most likely explanation?
A. Improper concrete curing
B. Differential settlement
C. Thermal stress cracking
D. Rebar corrosion expansion
Correct Answer: B
Explanation: Stair-step cracks following mortar joints are a classic sign of differential
settlement, indicating different parts of the foundation moved at different rates.
Question 8
While inspecting a wood-framed wall, you find decay below a window sill and water staining
on the exterior finish in that area. What is the most likely moisture source?
A. Roof leak
B. Missing or improperly installed flashing around the window frame
C. Failed foundation drainage
D. Indoor humidity condensation
Correct Answer: B
Answers & Detailed Rationales, Structural Systems, Roofing,
Electrical, HVAC, Plumbing & Ohio Regulations
Part 1: Structural Systems & Foundations (Questions 1–25)
Question 1
While inspecting a two-story house, you find a horizontal crack in the foundation wall
approximately 3/8 inch wide, with slight inward bowing. What is the most likely cause?
A. Normal concrete shrinkage
B. Surface cracking from thermal expansion
C. Lateral soil pressure or frost heave pushing against the foundation
D. Uneven settlement from insufficient footing thickness
Correct Answer: C
Explanation: A horizontal crack with inward bowing is classic evidence of lateral soil pressure
or frost heave. Vertical or diagonal cracks more commonly indicate settlement.
Question 2
In a crawlspace, you see a 6×6 wood post resting directly on a 4-inch concrete pad,
supporting the main beam above. What is the primary defect with this installation?
A. The wood post is not pressure-treated
B. The post lacks a metal connector at the beam above
C. The concrete pad is too thin
D. The post cross-section is undersized
,Correct Answer: B
Explanation: A post merely resting under a beam without a metal cap or bracket cannot
resist lateral displacement. This is a structural connection defect more critical than pad
thickness or wood preservation.
Question 3
You observe a white powdery deposit on the foundation wall in a 1950s crawlspace, with
dampness present. What is the most accurate description of this phenomenon?
A. Mold growth
B. Efflorescence
C. Concrete carbonation
D. Termite damage
Correct Answer: B
Explanation: Efflorescence is a white deposit left when water carries salts through masonry
and evaporates on the surface. It indicates moisture migration, not mold or insect activity.
Question 4
While inspecting a new house, you find a hairline crack less than 1/16 inch wide in the
concrete floor, with no displacement. What is the most appropriate report wording?
A. Structural foundation defect; recommend immediate evaluation
B. Shrinkage crack, a normal part of concrete curing
C. Early sign of freeze-thaw damage
D. Clear evidence of foundation settlement
,Correct Answer: B
Explanation: Fine cracks without displacement are typically shrinkage cracks from concrete
curing and are normal. Inspectors should describe findings without exaggerating.
Question 5
A brick exterior wall extends directly to soil contact with no damp-proof course visible. What
problem is this condition most likely to cause?
A. Freeze-thaw spalling of brick
B. Capillary rise of moisture
C. Thermal expansion of mortar joints
D. Structural wall instability
Correct Answer: B
Explanation: When brick contacts soil without a damp-proof course, water migrates upward
by capillary action, causing wall dampness, efflorescence, and interior damage.
Question 6
During an inspection, you find a floor joist notched approximately one-third of its depth to
accommodate a pipe. What is the most accurate description in your report?
A. This is a common plumbing practice and needs no comment
B. The joist cross-section is reduced, affecting load capacity
C. Acceptable if the remaining wood is dry
D. Check whether the joist has a metal reinforcement plate
Correct Answer: B
, Explanation: Notching a joist significantly reduces its structural capacity, especially in the
tension zone at the bottom edge. Inspectors should report this defect.
Question 7
A concrete foundation wall has a stair-step crack about 1/8 inch wide extending downward
from a window corner. What is the most likely explanation?
A. Improper concrete curing
B. Differential settlement
C. Thermal stress cracking
D. Rebar corrosion expansion
Correct Answer: B
Explanation: Stair-step cracks following mortar joints are a classic sign of differential
settlement, indicating different parts of the foundation moved at different rates.
Question 8
While inspecting a wood-framed wall, you find decay below a window sill and water staining
on the exterior finish in that area. What is the most likely moisture source?
A. Roof leak
B. Missing or improperly installed flashing around the window frame
C. Failed foundation drainage
D. Indoor humidity condensation
Correct Answer: B
