National Home Inspector Examination
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. When inspecting a roof structure from the interior of the attic, which of the
most common signs indicates long-term active structural sagging of the
ridge beam? A. Regular spaced mechanical fastener withdrawal at the collar
ties B. Diagonal checking along the grain of the ceiling joists near the top
plates C. A distinct downward curvature of the ridge with separating rafter
tails and birdsmouth cuts D. Localized water staining around the chimney
flashing boot C. A distinct downward curvature of the ridge with
separating rafter tails and birdsmouth cuts Rationale: A structural ridge
beam is designed to carry the dead and live loads of the roof without
sagging. When it fails or undergoes excessive deflection, it exhibits a
distinct downward curvature, which forces the rafters outward, causing
separation at critical connection points like rafter tails and birdsmouth
cuts. Option A indicates minor connection issues, Option B represents
drying checks in joists, and Option D is a moisture penetration issue rather
than primary structural sagging.
2. During an inspection of a concrete masonry unit (CMU) foundation wall,
you observe a horizontal crack measuring 1/4 inch wide running along a
mortar joint three courses below grade. What is the most likely cause of this
condition? A. Hydrostatic pressure or lateral soil pressure from expansive
soils B. Differential settlement of the corner footing pad C. Thermal
expansion and contraction of the upper floor framing floor joists D.
Shrinkage of the concrete mix during the initial curing phase A. Hydrostatic
pressure or lateral soil pressure from expansive soils Rationale: Horizontal
cracking along mortar joints in a CMU foundation wall, particularly below
, grade, is a classic symptom of lateral displacement caused by external soil
pressure, high water tables, or expansive clays pushing inward against the
wall. Differential settlement (B) typically causes vertical or stair-step
cracking. Thermal expansion (C) affects framing connections, and curing
shrinkage (D) manifests as fine hair-like cracks within the first few months
of construction.
3. Which of the following conditions represents a safety hazard regarding an
attached garage that requires immediate correction in a home inspection
report? A. A 1-3/4 inch solid core wood door separating the house and the
garage B. A pet door installed through the bottom section of the door
leading to the living space C. The presence of a dedicated 20-amp GFCI-
protected circuit supplying the garage receptacles D. A drywall ceiling taped
with a single coat of joint compound but not painted B. A pet door installed
through the bottom section of the door leading to the living space
Rationale: Fire separation regulations between an attached garage and a
living space are strictly designed to prevent the migration of fire and toxic
fumes (such as carbon monoxide). Installing a pet door breaches this fire-
rated barrier completely, rendering the passive fire protection useless. A
1-3/4 inch solid wood door (A) is an acceptable fire-rated barrier. GFCI
protection (C) is a safety requirement, not a hazard, and unpainted taped
drywall (D) still maintains its fundamental fire-resistive properties.
4. A gas-fired water heater is installed in a closet located directly inside a
bedroom. Which installation feature is mandatory for safety compliance? A.
A standard louvered door to allow air from the bedroom to enter the closet
space B. A direct-vent system or a sealed combustion chamber drawing
combustion air from the exterior C. A manually operated gas shutoff valve
located behind the water heater tank assembly D. A temperature and
pressure relief valve drain line terminating 12 inches above the bedroom
floor B. A direct-vent system or a sealed combustion chamber drawing
combustion air from the exterior Rationale: Gas-fired appliances installed
in bedrooms or bathrooms must be isolated from the living space's
ambient atmosphere to prevent carbon monoxide poisoning and oxygen
, depletion. A direct-vent or sealed combustion setup ensures that air for
combustion is drawn exclusively from outdoors. Louvered doors (A) would
illegally pull air from the sleeping room. Shutoff valves (C) must be
accessible, and TPR lines (D) must terminate between 6 inches and 2
inches above the floor or floor drain, never high up in a living area.
5. While inspecting a service panel, you notice a 15-amp circuit breaker is
connected to a 14 AWG copper wire, which is further spliced to a 12 AWG
aluminum wire leading out to the circuit. What is the critical issue here? A.
The 15-amp breaker is oversized for the 14 AWG copper wire profile B. The
use of aluminum wire is completely banned for all residential branch
circuits C. The splice between copper and aluminum requires specific anti-
oxidant paste and approved connectors D. The 12 AWG aluminum wire has
an insufficient current carrying capacity for a 15-amp breaker C. The splice
between copper and aluminum requires specific anti-oxidant paste and
approved connectors Rationale: Copper and aluminum expand and
contract at different rates, and galvanic corrosion occurs when they come
into direct contact, creating high resistance and fire hazards. Splices
between these materials must use specialized connectors (like Al/Cu rated
wire nuts or blocks) and anti-oxidant paste. A 15-amp breaker is perfectly
matched for 14 AWG copper (A). Single-strand aluminum branch wiring is
a hazard but not completely banned from existing homes (B), and 12 AWG
aluminum is safely rated for 15 amps (D).
6. What is the primary purpose of a cricket installed on a residential roof
structure? A. To provide secondary mechanical support for heavy masonry
chimney stacks B. To deflect water away from the upslope side of a wide
chimney or roof intersection C. To bridge the gap between two varying roof
slopes to prevent shingle curling D. To cover structural rafter tie ends along
the lower eave edges B. To deflect water away from the upslope side of a
wide chimney or roof intersection Rationale: A cricket (or saddle) is a
small peak structure built behind the high side of a chimney or wall
intersection that is wider than 30 inches. Its sole engineering purpose is to
divert water around the obstruction, preventing pooling, ice damming,
, and severe flashing leaks. It does not provide structural support to
masonry (A), bridge slopes for shingle curling (C), or cover rafter ends (D).
7. During the inspection of a deck, which of the following construction
practices represents a major structural defect? A. Joists attached to a ledger
board using properly nailed joist hangers B. Guardrail posts mounted to the
exterior face of the rim joist using only standard drywall screws C. Ledger
board secured to the house framing with 1/2-inch hot-dipped galvanized lag
screws D. Post-to-beam connections reinforced with heavy-duty galvanized
metal connector plates B. Guardrail posts mounted to the exterior face of
the rim joist using only standard drywall screws Rationale: Drywall screws
lack the shear strength, diameter, and corrosion resistance required to
support structural loads. Guardrail posts must withstand a 200-pound
lateral load, requiring through-bolts or approved structural lag screws.
Joist hangers (A), lag screws into house framing (C), and galvanized
connector plates (D) are standard, approved structural practices for deck
construction.
8. What does the presence of significant efflorescence on the interior surface
of a concrete basement wall indicate? A. The concrete mix used during
construction was contaminated with high concentrations of organic matter
B. Moisture has been penetrating through the foundation wall and
evaporating, leaving mineral deposits behind C. The basement wall is
undergoing a chemical breakdown known as alkali-silica reactivity D.
External radon gas is actively leaking into the basement workspace through
microscopic pores B. Moisture has been penetrating through the
foundation wall and evaporating, leaving mineral deposits behind
Rationale: Efflorescence is a white, powdery crystalline deposit of soluble
salts left on the surface of concrete, brick, or mortar after water migrates
through the material and evaporates. It is a definitive indicator of
moisture intrusion from the exterior soil. It is not caused by organic
contamination (A), alkali-silica destruction (C), or radon gas movement
(D).
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. When inspecting a roof structure from the interior of the attic, which of the
most common signs indicates long-term active structural sagging of the
ridge beam? A. Regular spaced mechanical fastener withdrawal at the collar
ties B. Diagonal checking along the grain of the ceiling joists near the top
plates C. A distinct downward curvature of the ridge with separating rafter
tails and birdsmouth cuts D. Localized water staining around the chimney
flashing boot C. A distinct downward curvature of the ridge with
separating rafter tails and birdsmouth cuts Rationale: A structural ridge
beam is designed to carry the dead and live loads of the roof without
sagging. When it fails or undergoes excessive deflection, it exhibits a
distinct downward curvature, which forces the rafters outward, causing
separation at critical connection points like rafter tails and birdsmouth
cuts. Option A indicates minor connection issues, Option B represents
drying checks in joists, and Option D is a moisture penetration issue rather
than primary structural sagging.
2. During an inspection of a concrete masonry unit (CMU) foundation wall,
you observe a horizontal crack measuring 1/4 inch wide running along a
mortar joint three courses below grade. What is the most likely cause of this
condition? A. Hydrostatic pressure or lateral soil pressure from expansive
soils B. Differential settlement of the corner footing pad C. Thermal
expansion and contraction of the upper floor framing floor joists D.
Shrinkage of the concrete mix during the initial curing phase A. Hydrostatic
pressure or lateral soil pressure from expansive soils Rationale: Horizontal
cracking along mortar joints in a CMU foundation wall, particularly below
, grade, is a classic symptom of lateral displacement caused by external soil
pressure, high water tables, or expansive clays pushing inward against the
wall. Differential settlement (B) typically causes vertical or stair-step
cracking. Thermal expansion (C) affects framing connections, and curing
shrinkage (D) manifests as fine hair-like cracks within the first few months
of construction.
3. Which of the following conditions represents a safety hazard regarding an
attached garage that requires immediate correction in a home inspection
report? A. A 1-3/4 inch solid core wood door separating the house and the
garage B. A pet door installed through the bottom section of the door
leading to the living space C. The presence of a dedicated 20-amp GFCI-
protected circuit supplying the garage receptacles D. A drywall ceiling taped
with a single coat of joint compound but not painted B. A pet door installed
through the bottom section of the door leading to the living space
Rationale: Fire separation regulations between an attached garage and a
living space are strictly designed to prevent the migration of fire and toxic
fumes (such as carbon monoxide). Installing a pet door breaches this fire-
rated barrier completely, rendering the passive fire protection useless. A
1-3/4 inch solid wood door (A) is an acceptable fire-rated barrier. GFCI
protection (C) is a safety requirement, not a hazard, and unpainted taped
drywall (D) still maintains its fundamental fire-resistive properties.
4. A gas-fired water heater is installed in a closet located directly inside a
bedroom. Which installation feature is mandatory for safety compliance? A.
A standard louvered door to allow air from the bedroom to enter the closet
space B. A direct-vent system or a sealed combustion chamber drawing
combustion air from the exterior C. A manually operated gas shutoff valve
located behind the water heater tank assembly D. A temperature and
pressure relief valve drain line terminating 12 inches above the bedroom
floor B. A direct-vent system or a sealed combustion chamber drawing
combustion air from the exterior Rationale: Gas-fired appliances installed
in bedrooms or bathrooms must be isolated from the living space's
ambient atmosphere to prevent carbon monoxide poisoning and oxygen
, depletion. A direct-vent or sealed combustion setup ensures that air for
combustion is drawn exclusively from outdoors. Louvered doors (A) would
illegally pull air from the sleeping room. Shutoff valves (C) must be
accessible, and TPR lines (D) must terminate between 6 inches and 2
inches above the floor or floor drain, never high up in a living area.
5. While inspecting a service panel, you notice a 15-amp circuit breaker is
connected to a 14 AWG copper wire, which is further spliced to a 12 AWG
aluminum wire leading out to the circuit. What is the critical issue here? A.
The 15-amp breaker is oversized for the 14 AWG copper wire profile B. The
use of aluminum wire is completely banned for all residential branch
circuits C. The splice between copper and aluminum requires specific anti-
oxidant paste and approved connectors D. The 12 AWG aluminum wire has
an insufficient current carrying capacity for a 15-amp breaker C. The splice
between copper and aluminum requires specific anti-oxidant paste and
approved connectors Rationale: Copper and aluminum expand and
contract at different rates, and galvanic corrosion occurs when they come
into direct contact, creating high resistance and fire hazards. Splices
between these materials must use specialized connectors (like Al/Cu rated
wire nuts or blocks) and anti-oxidant paste. A 15-amp breaker is perfectly
matched for 14 AWG copper (A). Single-strand aluminum branch wiring is
a hazard but not completely banned from existing homes (B), and 12 AWG
aluminum is safely rated for 15 amps (D).
6. What is the primary purpose of a cricket installed on a residential roof
structure? A. To provide secondary mechanical support for heavy masonry
chimney stacks B. To deflect water away from the upslope side of a wide
chimney or roof intersection C. To bridge the gap between two varying roof
slopes to prevent shingle curling D. To cover structural rafter tie ends along
the lower eave edges B. To deflect water away from the upslope side of a
wide chimney or roof intersection Rationale: A cricket (or saddle) is a
small peak structure built behind the high side of a chimney or wall
intersection that is wider than 30 inches. Its sole engineering purpose is to
divert water around the obstruction, preventing pooling, ice damming,
, and severe flashing leaks. It does not provide structural support to
masonry (A), bridge slopes for shingle curling (C), or cover rafter ends (D).
7. During the inspection of a deck, which of the following construction
practices represents a major structural defect? A. Joists attached to a ledger
board using properly nailed joist hangers B. Guardrail posts mounted to the
exterior face of the rim joist using only standard drywall screws C. Ledger
board secured to the house framing with 1/2-inch hot-dipped galvanized lag
screws D. Post-to-beam connections reinforced with heavy-duty galvanized
metal connector plates B. Guardrail posts mounted to the exterior face of
the rim joist using only standard drywall screws Rationale: Drywall screws
lack the shear strength, diameter, and corrosion resistance required to
support structural loads. Guardrail posts must withstand a 200-pound
lateral load, requiring through-bolts or approved structural lag screws.
Joist hangers (A), lag screws into house framing (C), and galvanized
connector plates (D) are standard, approved structural practices for deck
construction.
8. What does the presence of significant efflorescence on the interior surface
of a concrete basement wall indicate? A. The concrete mix used during
construction was contaminated with high concentrations of organic matter
B. Moisture has been penetrating through the foundation wall and
evaporating, leaving mineral deposits behind C. The basement wall is
undergoing a chemical breakdown known as alkali-silica reactivity D.
External radon gas is actively leaking into the basement workspace through
microscopic pores B. Moisture has been penetrating through the
foundation wall and evaporating, leaving mineral deposits behind
Rationale: Efflorescence is a white, powdery crystalline deposit of soluble
salts left on the surface of concrete, brick, or mortar after water migrates
through the material and evaporates. It is a definitive indicator of
moisture intrusion from the exterior soil. It is not caused by organic
contamination (A), alkali-silica destruction (C), or radon gas movement
(D).
