Home Inspector Practice Exam
186 free Home Inspector practice questions with answers and explanations.
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The Home Inspector exam is administered by EBPHI, with 175 scored questions and a time limit of 4 hours.
About these practice questions
These are original study questions written from published exam objectives—not recalled, copied, or confidential live-exam items. Always confirm current coverage with the official sources linked on this page.
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State Law
5 questions1. On the scaled scoring system used for the licensing examination, which of the following represents a passing performance?
- A. A scaled score of 450 on a 200-800 scale
- B. A scaled score of 500 on a 200-800 scale
- C. A scaled score of 70 on a 0-100 scale
- D. A scaled score of 600 on a 300-900 scale
Show answer & explanation
Answer: B
The examination uses a passing standard of 500 on a scale that ranges from 200 to 800.2. Which of the following subject areas is NOT among the content areas covered by the National Home Inspector Examination?
- A. Insulation
- B. Electrical
- C. Swimming pools and spas
- D. Roof
Show answer & explanation
Answer: C
The examination's content areas are the roof, exterior, structure, electrical, HVAC, plumbing, interior, insulation, and ventilation. Swimming pools and spas are not among the enumerated content areas.3. What proportion of the questions presented on the National Home Inspector Examination count toward the candidate's score?
- A. 80%
- B. 87.5%
- C. 100%
- D. 75%
Show answer & explanation
Answer: B
Of the 200 questions presented, 175 are scored. 175 divided by 200 equals 0.875, so 87.5% of the questions count toward the candidate's score.4. A candidate fails the examination on the first try and registers to sit for it a second time, paying the standard fee each time. What is the total amount spent on examination fees across both attempts?
- A. $225
- B. $337.50
- C. $400
- D. $450
Show answer & explanation
Answer: D
The examination fee is $225 per attempt. Two attempts at $225 each total $450.5. What is the maximum time allowed for a candidate to complete the National Home Inspector Examination?
- A. 3 hours
- B. 5 hours
- C. 3.5 hours
- D. 4 hours
Show answer & explanation
Answer: D
Candidates have 4 hours (240 minutes) to complete the examination.
Property Ownership
9 questions6. Which of the following is NOT an encumbrance on real property?
- A. A mortgage lien
- B. A utility easement
- C. A neighbor's fence extending over the boundary line
- D. The owner's right to exclude others from the property
Show answer & explanation
Answer: D
An encumbrance is a claim, right, or interest held by someone other than the owner that burdens the property, such as liens, easements, and encroachments. The right to exclude others is part of the owner's own bundle of rights, not a burden on title.7. A grantor conveys a home to her brother for the duration of his life, providing that upon his death the property passes to her daughter. While the brother is alive, the daughter's interest is called a:
- A. Reversion
- B. Remainder
- C. Leasehold
- D. Homestead
Show answer & explanation
Answer: B
When a life estate is created and the property is designated to pass to a named third party at the end of the measuring life, that third party holds a remainder interest. A reversion exists only when the property returns to the grantor, and leasehold and homestead interests are unrelated to this future-interest structure.8. Which statement correctly describes the relationship between a deed and title?
- A. A deed is the ownership interest itself, while title is the paper document
- B. A deed is the written instrument that conveys title, which is the legal concept of ownership
- C. Title and deed are interchangeable terms for the recorded survey of a parcel
- D. A deed guarantees the physical condition of the property, while title guarantees its value
Show answer & explanation
Answer: B
Title refers to the abstract legal concept of ownership and the rights that come with it, while a deed is the written instrument used to transfer that title from grantor to grantee. Neither term refers to a survey, and neither guarantees physical condition or market value.9. A survey reveals that a homeowner's detached garage was built partly on the adjoining lot. From the adjoining owner's perspective, the garage is an example of:
- A. An encroachment
- B. An easement by necessity
- C. A deed restriction
- D. A riparian right
Show answer & explanation
Answer: A
An encroachment is a physical improvement that unlawfully extends onto another person's land, and it is typically discovered by survey. An easement by necessity is a legally created access right, a deed restriction is a private limitation on use, and riparian rights concern water adjacent to land.10. The 'bundle of rights' associated with real property ownership includes all of the following EXCEPT:
- A. The right to violate zoning ordinances on one's own land
- B. The right of possession
- C. The right of disposition
- D. The right of exclusion
Show answer & explanation
Answer: A
The bundle of rights traditionally includes possession, control, enjoyment, exclusion, and disposition. Ownership rights remain subject to public restrictions such as zoning, so a right to disregard land-use regulations is not part of the bundle.11. How does a freehold estate differ from a leasehold estate?
- A. A freehold estate is an ownership interest of uncertain or unlimited duration, while a leasehold is a possessory interest for a limited term
- B. A freehold estate always expires on a fixed date, while a leasehold lasts forever
- C. A freehold estate can never be transferred, while a leasehold is freely assignable
- D. A freehold estate applies only to commercial property, while a leasehold applies only to residential property
Show answer & explanation
Answer: A
Freehold estates, such as fee simple and life estates, are ownership interests of indeterminate duration. Leasehold estates give a tenant possession for a limited period without conveying ownership. Transferability and property type do not define the distinction, and it is the leasehold—not the freehold—that runs for a fixed term.12. A recorded right allows the owner of a landlocked rear lot to cross a neighbor's driveway to reach the public road. The right benefits the rear lot and transfers automatically with it when sold. This right is BEST described as:
- A. An easement in gross
- B. A license
- C. An easement appurtenant
- D. An encroachment
Show answer & explanation
Answer: C
An easement appurtenant benefits a specific parcel (the dominant estate) and burdens another (the servient estate), and it runs with the land upon transfer. An easement in gross benefits a person or entity rather than a parcel, a license is a revocable personal permission, and an encroachment is an unauthorized physical intrusion.13. Which characteristic distinguishes a tenancy in common from a joint tenancy?
- A. Co-owners may hold unequal shares and devise their interest to heirs
- B. All co-owners must acquire title at the same moment
- C. A surviving co-owner automatically absorbs a deceased co-owner's share
- D. The property cannot be partitioned among the co-owners
Show answer & explanation
Answer: A
Tenants in common may hold unequal undivided interests, and each interest is inheritable and freely transferable. Simultaneous acquisition of title and automatic survivorship are features associated with joint tenancy, and co-owned property generally remains subject to partition.14. Two siblings own a parcel as joint tenants. One sibling dies. What happens to the deceased sibling's interest?
- A. It automatically transfers to the surviving joint tenant
- B. It passes to the deceased sibling's heirs through probate
- C. It reverts to the original grantor
- D. It is sold at public auction to satisfy the estate
Show answer & explanation
Answer: A
Joint tenancy carries the right of survivorship: when one joint tenant dies, that interest passes automatically to the surviving joint tenant(s) outside of probate. Passing to heirs is characteristic of tenancy in common, not joint tenancy.
Contracts
11 questions15. To provide the greatest protection to both the inspector and the client, when should the pre-inspection agreement be signed?
- A. Before the inspection begins
- B. While the inspector is writing the report
- C. When the report is delivered to the client
- D. Only if a dispute later arises
Show answer & explanation
Answer: A
A contract signed before the service is performed ensures both parties have agreed to the scope, limitations, and terms before any reliance occurs. Signing during or after the inspection weakens the argument that the client knowingly accepted the terms, and a contract cannot be created retroactively once a dispute exists.16. An inspector's agreement contains a clause capping any damages owed to the client at the amount the client paid for the inspection. This is BEST described as a:
- A. Severability clause
- B. Limitation of liability clause
- C. Indemnification clause
- D. Merger clause
Show answer & explanation
Answer: B
A limitation of liability clause restricts the amount a party can recover in damages, commonly capping recovery at the fee paid. A severability clause preserves the rest of the contract if one part fails, an indemnification clause shifts responsibility for third-party claims, and a merger clause states the written contract is the entire agreement.17. An inspector contracts with a homebuyer. After closing, the buyer's cousin — who never signed the agreement — claims she relied on the inspection report when lending the buyer money, and threatens to sue for breach of contract. The inspector's strongest contract-based defense is that:
- A. The cousin lacks privity of contract with the inspector
- B. Inspection reports can never be shown to anyone but the client
- C. Verbal complaints cannot lead to lawsuits
- D. The report became void at closing
Show answer & explanation
Answer: A
Contract obligations generally run only between the parties who entered the agreement — the inspector and the client. A third party who is not in privity of contract typically cannot enforce it. The other choices misstate how contracts and reports work: reports may be shared, verbal complaints can precede litigation, and closing does not void a report.18. A clause in an inspector-drafted agreement is genuinely ambiguous, and the client and inspector each read it differently in a later dispute. Under a common rule of contract interpretation, the ambiguity is MOST likely to be construed:
- A. In favor of the inspector, as the professional party
- B. Against the party who drafted the contract
- C. By discarding the entire agreement
- D. In favor of whichever party signed first
Show answer & explanation
Answer: B
Ambiguous contract language is commonly interpreted against the drafter, since the drafter controlled the wording and could have made it clear. This is why inspectors should write agreements in plain, unambiguous language. Ambiguity does not automatically void the contract, and signing order is irrelevant.19. An inspector agrees over the phone to inspect a home, performs the inspection, and only afterward mails the client an unsigned agreement. Compared with obtaining a signed written agreement in advance, the inspector's approach is problematic PRIMARILY because:
- A. Verbal agreements always carry criminal penalties
- B. Mailing documents is not a valid form of delivery
- C. The terms, scope, and limitations were never documented and accepted before the client relied on the service
- D. An inspection may never be discussed by phone
Show answer & explanation
Answer: C
The core problem is proof and timing: without a written agreement accepted before the work, there is no clear record that the client agreed to the scope and limitations, so those protections may not apply. Verbal contracting is not criminal, mail is a valid delivery method, and phone discussions are perfectly acceptable.20. During a licensing examination, a candidate is asked to identify the essential elements required for a legally enforceable contract. Which of the following is NOT one of the traditional elements necessary for contract formation?
- A. Offer and acceptance
- B. Consideration
- C. Notarization by a licensed notary public
- D. Legal capacity of the parties
Show answer & explanation
Answer: C
Notarization is not one of the traditional elements required for contract formation. A contract generally requires an offer, acceptance, consideration, mutual assent, legal capacity, and a lawful purpose. Notarization may be required for certain recordings but is not itself an element of formation.21. A home inspector asks a new client to sign a pre-inspection agreement. What is the PRIMARY purpose of this document?
- A. To guarantee that the home is free of defects
- B. To define the scope of the inspection and the responsibilities of each party before the work begins
- C. To transfer liability for defects from the seller to the buyer
- D. To satisfy the lender's appraisal requirements
Show answer & explanation
Answer: B
A pre-inspection agreement establishes what the inspection will and will not cover and sets each party's obligations before the service is performed. It is not a warranty of condition, does not shift liability between buyer and seller, and is unrelated to lender appraisal requirements.22. Which set of elements is generally required for a home inspection contract to be enforceable?
- A. Offer, acceptance, and consideration
- B. Notarization, witnesses, and a corporate seal
- C. A licensed attorney's signature and a filing with the county
- D. An appraisal, a title search, and a survey
Show answer & explanation
Answer: A
The basic elements of an enforceable contract are a valid offer, acceptance of that offer, and consideration exchanged between the parties. Notarization, attorney involvement, and property-transaction documents such as appraisals or surveys are not required to form a service contract.23. Midway through an inspection, the client verbally asks the inspector to also evaluate a detached workshop that is excluded under the signed agreement. What is the MOST appropriate way to handle this request?
- A. Inspect the workshop informally without documenting it
- B. Refuse, because a signed contract can never be changed
- C. Amend the agreement in writing, with both parties consenting to the revised scope and any revised fee
- D. Inspect the workshop but omit it from the written report
Show answer & explanation
Answer: C
A contract's scope can be modified, but the change should be made by mutual consent and documented in writing so the expanded work is covered by the same terms and limitations as the original agreement. Performing undocumented work exposes the inspector to liability outside the contract's protections, and refusing outright is unnecessary because contracts can be amended.24. A pre-inspection agreement states that any dispute between the inspector and the client must be resolved through binding arbitration. The main effect of this clause is to:
- A. Prevent the client from ever raising a complaint
- B. Require disputes to be decided outside the court system by a neutral third party
- C. Guarantee the inspector wins any dispute
- D. Make the inspector's report legally binding on the seller
Show answer & explanation
Answer: B
An arbitration clause channels disputes to a neutral arbitrator instead of the courts. It does not bar complaints, predetermine the outcome, or bind non-parties such as the seller.25. An inspector's agreement contains an exculpatory clause stating the inspector bears no responsibility whatsoever for any error, including gross negligence. A court reviewing this clause would MOST likely:
- A. Enforce it automatically because the client signed it
- B. Scrutinize it closely and possibly refuse to enforce it as against public policy
- C. Treat it as converting the contract into a warranty
- D. Apply it to the seller as well as the client
Show answer & explanation
Answer: B
Clauses that attempt to eliminate all responsibility — especially for gross negligence — are disfavored and courts often refuse to enforce them on public-policy grounds, even when signed. A signature does not make an overreaching clause automatically enforceable, the clause does not create a warranty, and contract terms do not bind non-parties like the seller.
Heating, Ventilation and Air Conditioning
11 questions26. What is the function of the reversing valve in a heat pump?
- A. It changes the direction of refrigerant flow so the outdoor coil and indoor coil swap roles between heating and cooling
- B. It regulates the flow of combustion air
- C. It controls the blower speed
- D. It relieves excess refrigerant pressure
Show answer & explanation
Answer: A
Reversing refrigerant flow makes the indoor coil the condenser in heating mode and the evaporator in cooling mode, which is what lets one machine do both. A failed reversing valve typically produces a system that heats when it should cool or cannot switch modes at all.27. An inspector observes rust staining and soot around the base of a gas furnace flue connection. What condition should be suspected?
- A. Backdrafting of combustion products into the living space, which is a safety hazard requiring immediate attention
- B. Normal condensation from a high-efficiency appliance
- C. Excess combustion air causing over-ventilation
- D. A cosmetic finish failure on the flue pipe
Show answer & explanation
Answer: A
Soot and corrosion at a draft hood or flue joint suggest flue gases are spilling rather than venting, which can deliver carbon monoxide indoors. Causes include a blocked or undersized flue, inadequate combustion air, or depressurization from exhaust fans. The finding is reported as a safety issue for prompt evaluation.28. Why is a cracked heat exchanger in a forced-air furnace a serious defect?
- A. It can allow combustion products including carbon monoxide to mix with the circulating supply air
- B. It affects only the furnace's efficiency rating
- C. It reduces the blower's airflow only
- D. It prevents the thermostat from calling for heat
Show answer & explanation
Answer: A
The heat exchanger separates combustion gases from the air delivered to the house, so a breach can introduce carbon monoxide into every room the ductwork serves. Because full inspection requires disassembly beyond an inspector's scope, suspected cracks are reported for evaluation by a qualified heating contractor.29. A heat pump is operating in cold weather and the inspector observes the auxiliary electric heat energized. What does this indicate?
- A. Outdoor temperature is at or below the balance point where the heat pump alone cannot meet the heating load
- B. The compressor has failed
- C. The reversing valve is stuck in cooling
- D. The system is overcharged with refrigerant
Show answer & explanation
Answer: A
A heat pump's capacity falls as outdoor temperature drops, and below the balance point supplemental resistance heat makes up the difference. Auxiliary heat operation in cold weather is expected behavior, while auxiliary heat running in mild weather suggests a control or refrigeration problem worth reporting.30. An inspector finds the condensate drain line from a cooling coil disconnected and dripping into the furnace cabinet. What is the concern?
- A. Water intrusion causing corrosion of the furnace and potential microbial growth in the air handler
- B. Reduced cooling capacity only
- C. No concern, since condensate is clean water
- D. Excessive refrigerant charge
Show answer & explanation
Answer: A
A cooling coil removes substantial moisture from the air, and uncontrolled condensate corrodes the heat exchanger and cabinet and wets surfaces where microbial growth occurs. Related findings include a missing or improperly trapped drain, a blocked line producing pan overflow, and an absent secondary pan where one is warranted.31. Why should an inspector avoid operating an air conditioning compressor when the outdoor temperature is well below the manufacturer's minimum?
- A. Operating in low ambient conditions can damage the compressor, so the limitation is noted in the report instead
- B. The system cannot be tested at any temperature
- C. Low temperature testing voids the home's title insurance
- D. The compressor will run but produce no measurable result
Show answer & explanation
Answer: A
Cold ambient operation can cause liquid refrigerant to reach the compressor and damage it, so standards of practice permit the inspector to decline the test and report the reason. Documenting why a system was not operated is part of describing the inspection's limitations rather than an omission.32. A supply register in a far bedroom delivers noticeably less air than others. Which cause should the inspector consider?
- A. Duct restriction, disconnection or leakage, or inadequate duct sizing for the run length
- B. An oversized furnace heat exchanger
- C. Excessive attic insulation
- D. A missing chimney cricket
Show answer & explanation
Answer: A
Weak delivery at the end of a long run typically reflects friction loss, crushed or disconnected flexible duct, closed dampers or leakage into unconditioned space. Return air restriction can also reduce total airflow, which is why an inspector notes blocked or undersized returns alongside supply observations.33. While observing a gas furnace in operation, the inspector sees burner flames that are largely yellow, tall, and wavering rather than steady and blue. What does this suggest?
- A. Incomplete combustion is occurring, which wastes fuel and can generate carbon monoxide; the unit should be serviced and evaluated.
- B. The furnace is operating in a normal high-efficiency mode.
- C. The gas pressure is too low for the burner to modulate properly.
- D. The thermocouple is failing and will soon shut down the burner.
Show answer & explanation
Answer: A
Clean combustion of natural gas produces a steady, mostly blue flame; a lazy yellow flame signals an improper air-fuel mixture from dirt, misadjustment, or inadequate combustion air, and incomplete combustion is the process that produces carbon monoxide. Because the byproduct is toxic and invisible, the observation warrants service by a qualified technician. Attributing the color to a failing thermocouple confuses the safety sensor with the burner itself; the thermocouple's condition does not change flame chemistry.34. Several minutes after a natural-draft gas water heater's burner ignites, the inspector holds a mirror at the draft hood and it fogs while warm, moist air flows outward into the room. What does this observation indicate?
- A. The water heater's dip tube has failed, releasing tank moisture.
- B. Combustion products are spilling into the living space instead of rising up the flue, indicating a drafting failure that must be evaluated.
- C. The draft hood is functioning normally by mixing dilution air.
- D. The flue is oversized, improving the appliance's efficiency.
Show answer & explanation
Answer: B
After a brief warm-up period, a properly drafting appliance pulls room air inward at the draft hood along with all combustion byproducts. Warm, moist air flowing outward means flue gases, which contain water vapor and potentially carbon monoxide, are spilling into the occupied space, whether from a blocked flue, poor vent geometry, or depressurization of the room. The dip tube distractor borrows a real water heater component, but that part lives inside the tank's plumbing and has no path to release moisture at the draft hood.35. A furnace filter is found completely clogged with dust and debris. Beyond reduced comfort, what chain of problems can this single maintenance failure cause in a forced-air system with central cooling?
- A. Only higher utility bills, since airflow is self-regulating in modern systems.
- B. Duct leakage at the joints from increased static pressure, but no equipment effects.
- C. Premature filter frame corrosion that spreads to the blower housing.
- D. Starved airflow that can overheat the furnace heat exchanger, trip safety limits, freeze the cooling coil, and shorten equipment life.
Show answer & explanation
Answer: D
The filter sits in the common airstream, so blocking it strangles airflow for both heating and cooling. In heating, low airflow lets the heat exchanger run hot and cycle on its limit switch; in cooling, the low load on the evaporator coil drops its temperature until condensate freezes into an ice block that stops airflow entirely. Both stress the equipment. The answer limited to utility bills understates the mechanism: airflow is driven by a fixed blower working against whatever restriction exists, not self-regulating.36. At an air conditioner's outdoor unit, the larger-diameter refrigerant line has no insulation for most of its run to the house. Why should this be noted?
- A. Insulation is only decorative on refrigerant piping and its absence is cosmetic.
- B. The uninsulated suction line absorbs heat and sweats, reducing system efficiency and dripping condensation along its path.
- C. The exposed line will corrode rapidly without a protective jacket.
- D. The line will radiate heat into the house and warm the conditioned space.
Show answer & explanation
Answer: B
The larger line returns cool, low-pressure vapor to the compressor, and it is insulated for two reasons: to keep it from picking up unwanted heat that reduces cooling capacity and compressor reliability, and to prevent the cold surface from condensing moisture that drips onto framing and finishes. Corrosion is the appealing but wrong concern; the copper tolerates weather well, and the true costs of missing insulation are lost efficiency and chronic wetting along the line's route.
Plumbing Systems
6 questions37. What is the primary function of a plumbing vent?
- A. To admit air so drains flow freely and trap seals are not siphoned, and to carry sewer gas above the roof
- B. To supply fresh air to the building interior
- C. To relieve pressure in the water supply piping
- D. To provide combustion air to gas appliances
Show answer & explanation
Answer: A
Without venting, draining water creates negative pressure that slows flow and pulls trap seals, and positive pressure downstream can push seals out. Vents equalize pressure and exhaust gases above the roof. Improper venting shows up as slow drains, gurgling fixtures and intermittent sewer odor.38. What is the purpose of the temperature and pressure relief valve on a water heater?
- A. To discharge if temperature or pressure exceeds safe limits, preventing tank rupture
- B. To prevent backflow into the supply piping
- C. To regulate the delivered water temperature at fixtures
- D. To drain sediment from the tank bottom
Show answer & explanation
Answer: A
The relief valve is the water heater's primary safety device against catastrophic rupture. Common reported defects include a missing valve, a capped or plugged discharge, a discharge pipe that is undersized, reduced, or terminates in an unsafe location, and upward-sloping discharge piping that cannot drain.39. An inspector finds an S-trap under a lavatory sink. Why is this a defect?
- A. An S-trap can self-siphon, losing its water seal and allowing sewer gas into the room
- B. An S-trap restricts water supply pressure
- C. An S-trap is too shallow to catch debris
- D. An S-trap requires a larger drain opening
Show answer & explanation
Answer: A
In an S-trap the outlet turns downward without a vent, so a full slug of draining water can siphon the trap dry, breaking the seal that blocks sewer gas. A properly vented P-trap admits air behind the flow so the seal survives. S-traps are a common finding in older or amateur plumbing work.40. Which supply piping material is commonly reported as a concern because of a history of fitting failures?
- A. Type L copper
- B. Polybutylene
- C. Brass supply stops
- D. Cross-linked polyethylene installed with listed fittings
Show answer & explanation
Answer: B
Polybutylene supply systems developed a reputation for failures at fittings and joints and are frequently the subject of insurer and buyer concern, so their presence is reported. Galvanized steel is reported for internal corrosion and reduced flow, while copper and properly installed cross-linked polyethylene are standard current materials.41. An inspector observes a hose bib without a vacuum breaker and a garden hose submerged in a bucket. What hazard does this present?
- A. A cross connection permitting backsiphonage of contaminated water into the potable supply
- B. Excessive water pressure at the fixture
- C. Reduced flow at interior fixtures
- D. No hazard, since municipal water is chlorinated
Show answer & explanation
Answer: A
A drop in supply pressure can draw water backward through a submerged hose into the potable system, which is why exterior hose bibs require backflow protection. Similar cross connection concerns arise with submerged inlets, improper dishwasher or water softener drains, and irrigation connections lacking protection.42. Measured static water pressure at a hose bib is 105 psi. What should the inspector report?
- A. Pressure exceeds the normal range and a pressure reducing valve should be evaluated, since high pressure stresses fixtures and piping
- B. Pressure is within the normal range and requires no comment
- C. Pressure is too low and a booster pump is needed
- D. Pressure readings at a hose bib have no meaning
Show answer & explanation
Answer: A
Residential static pressure is typically expected in a range of roughly 40 to 80 psi, and sustained pressure above that accelerates failure of supply lines, valves, fill valves and water heaters. Excessive pressure is addressed with a pressure reducing valve, which often needs an accompanying thermal expansion tank.
Structure, Foundation and Framing
21 questions43. An inspector observes a horizontal crack running most of the length of a concrete block basement wall, with the wall displaced inward at the crack. What does this most likely indicate?
- A. Lateral soil pressure causing structural displacement, which warrants evaluation by a qualified engineer
- B. Normal shrinkage of the mortar joints
- C. Efflorescence with no structural significance
- D. Ordinary settlement requiring only cosmetic patching
Show answer & explanation
Answer: A
Horizontal cracking with inward displacement in a block wall signals lateral pressure from soil, saturated backfill or frost, and it is the most structurally concerning crack pattern in a foundation wall. Vertical and diagonal cracks more often reflect settlement or shrinkage. Efflorescence is a salt deposit indicating moisture movement, not displacement.44. Why must a foundation footing be placed below the local frost line?
- A. To prevent frost heave from lifting and cracking the foundation as saturated soil freezes and expands
- B. To reduce the amount of concrete required
- C. To allow room for a perimeter drain above the footing
- D. To satisfy insulation requirements
Show answer & explanation
Answer: A
Water in soil expands on freezing, and repeated freeze-thaw cycles beneath a shallow footing lift the foundation unevenly, cracking walls and slabs. Placing the footing below the frost depth keeps the bearing soil from freezing. Frost depth varies by climate, so the required depth is a local determination.45. An inspector finds a white powdery deposit on a basement wall. What does this indicate?
- A. Efflorescence, salts left behind by water migrating through the masonry, indicating moisture intrusion
- B. Structural failure of the mortar
- C. Mold growth requiring immediate remediation
- D. Normal curing of new concrete with no significance
Show answer & explanation
Answer: A
Efflorescence forms when water moves through masonry, dissolves salts and evaporates at the surface, leaving crystalline deposits. It is evidence of past or ongoing moisture movement rather than a structural defect or a biological growth, and the inspector's task is to identify the moisture source such as grading, gutters or a failed damp-proofing.46. What is the function of anchor bolts connecting the sill plate to the foundation?
- A. To resist uplift and lateral displacement of the framing relative to the foundation
- B. To provide a moisture break between wood and concrete
- C. To level the foundation before framing
- D. To support the vertical load of the floor joists
Show answer & explanation
Answer: A
Anchor bolts tie the structure to the foundation against wind uplift and seismic or lateral forces. Vertical loads transfer through bearing rather than through the bolts. Moisture separation is provided by using pressure-treated sill plate material and a sill sealer, which is a distinct requirement from anchorage.47. An inspector observes that a homeowner has cut a large notch in the bottom edge of a floor joist at midspan to run a pipe. Why is this significant?
- A. Notching the tension edge at midspan removes material where bending stress is greatest, substantially reducing capacity
- B. It has no structural effect as long as the notch is less than half the depth
- C. It affects only the appearance of the framing
- D. It improves load distribution across adjacent joists
Show answer & explanation
Answer: A
A simply supported joist carries maximum bending at midspan, with the bottom fibers in tension, so removing material there is the worst possible location for a notch. Notching is generally restricted to the end thirds and limited in depth, and holes must be kept away from the top and bottom edges.48. An inspector finds that a web member of an engineered roof truss has been cut to create attic access. What should the report state?
- A. The truss has been altered and requires evaluation by a qualified engineer, because truss members work as an interdependent system
- B. The alteration is acceptable if the cut member is not the bottom chord
- C. The cut may be repaired with any nailed wood scab
- D. No comment is needed since attic access is required
Show answer & explanation
Answer: A
A truss is engineered as a whole, so cutting any chord or web redistributes forces in ways the design did not contemplate and can lead to progressive failure. Repairs require an engineered detail rather than an improvised scab. This is among the most consequential framing alterations an inspector encounters in an attic.49. What distinguishes a bearing wall from a partition wall?
- A. A bearing wall carries loads from the structure above; a partition wall carries only its own weight and divides space
- B. A bearing wall is always an exterior wall
- C. A partition wall is always thicker than a bearing wall
- D. The two terms describe the same element
Show answer & explanation
Answer: A
Bearing walls transfer loads down to the foundation and may be interior or exterior, commonly running perpendicular to joists near their bearing points or beneath a girder above. Removing a bearing wall without an engineered header and posts is a serious defect, so identifying which walls are bearing matters in any renovation observation.50. A crawlspace has exposed soil and no vapor retarder, and the inspector observes condensation on the underside of the subfloor. What is the most likely mechanism?
- A. Soil moisture evaporating into the crawlspace and condensing on cooler surfaces
- B. A plumbing leak in every joist bay simultaneously
- C. Normal seasonal behavior requiring no comment
- D. Excess insulation in the crawlspace ceiling
Show answer & explanation
Answer: A
Bare soil releases substantial moisture into a crawlspace, raising humidity until it condenses on cooler framing and can support decay and mold. A continuous ground vapor retarder is the primary control, combined with appropriate ventilation or a conditioned crawlspace strategy, plus correcting exterior drainage.51. During an attic inspection, the inspector notes that the ridge sags visibly at midspan and the tops of the exterior walls have bowed outward at the eave line. The homeowner mentions that the ceiling joists were removed during a remodel to create a vaulted ceiling. What is the most likely structural explanation?
- A. Normal seasonal expansion and contraction of the framing lumber has permanently deformed the roof geometry.
- B. The roof sheathing was installed with insufficient nailing, letting the roof plane flex under wind loads.
- C. Removing the ceiling joists eliminated the tension ties that resist the outward thrust of the rafters, allowing the walls to spread and the ridge to drop.
- D. The ridge board has decayed from condensation, allowing the rafters to slip downward at their upper bearing points.
Show answer & explanation
Answer: C
Sloped rafters push outward on the walls that support them, and ceiling joists or rafter ties resist that thrust by acting in tension across the building. When those ties are removed, the walls spread and the ridge settles, which matches both observations. Ridge board decay is an appealing distractor, but the ridge board in conventional framing is not a structural beam and its condition would not cause the walls to bow outward.52. An inspector observes stair-step cracking in a brick veneer wall that begins near a foundation corner and widens as it rises toward the roofline. The crack follows the mortar joints diagonally across the wall. What does this pattern most likely indicate?
- A. Corrosion of the steel lintel above a window opening has lifted the courses of brick above it.
- B. The mortar was mixed with too much sand and is failing uniformly across the wall.
- C. Differential settlement of the foundation is causing one portion of the wall to drop relative to the rest.
- D. Normal thermal expansion of the brick veneer during summer heating cycles.
Show answer & explanation
Answer: C
Diagonal stair-step cracking that originates at a foundation corner and widens with height is the classic signature of differential settlement: one segment of the footing has moved relative to the adjacent segment, and the masonry above hinges around the point of movement. Lintel corrosion is a tempting alternative, but it produces localized cracking and displacement directly above a wall opening rather than a full-height diagonal crack rising from the foundation.53. On the underside of a concrete porch slab, the inspector finds areas where the surface concrete has broken away, exposing reinforcing steel that is heavily rusted. Which mechanism best explains this condition?
- A. Vibration from foot traffic has gradually delaminated the bottom surface of the slab.
- B. An alkali reaction within the aggregate is dissolving the cement paste around the steel.
- C. The concrete was placed during freezing weather and never reached its design strength.
- D. Moisture reached the embedded steel, and the expanding corrosion products forced the concrete cover to break away.
Show answer & explanation
Answer: D
Rusting steel occupies several times the volume of the original metal, so when moisture penetrates to embedded reinforcement, the expanding corrosion products generate internal pressure that spalls off the concrete cover, exposing the bar and accelerating the cycle. Cold-weather placement is a plausible-sounding distractor, but strength deficiencies show up as crumbling or cracking throughout the member, not as localized spalls centered on rusted reinforcing steel.54. In a crawlspace, the inspector finds a wood post supporting the main girder. The bottom of the post rests directly on the exposed soil with no footing or pier beneath it. Why should this be reported?
- A. Posts bearing on soil transmit excessive point loads that will fracture the girder above.
- B. The post will wick alkalinity from the soil, causing chemical breakdown of the wood fibers.
- C. Soil bearing is acceptable only for pressure-treated posts, and species verification is outside the scope of an inspection.
- D. Wood in direct contact with soil is subject to decay and wood-destroying insect attack, and the unfooted post can also settle under load.
Show answer & explanation
Answer: D
Direct wood-to-soil contact keeps the post at elevated moisture levels, inviting fungal decay and giving termites concealed access, while the absence of a footing means the concentrated load can push the post into the soil and let the girder settle. The alkalinity distractor sounds technical but is not the recognized failure mechanism; moisture-driven decay and insect attack are the reasons soil contact is reported, regardless of the wood species involved.55. A homeowner has cut a section out of the bottom flange of an engineered wood I-joist to route a drain line. How does this compare with drilling a hole through the joist's web?
- A. Both alterations are equally acceptable because engineered joists include a safety factor for field modifications.
- B. Cutting the flange is far more serious, because the flanges carry the bending forces while the web is designed to accept holes at manufacturer-approved locations.
- C. Cutting the flange is less serious, because the web is the primary load-carrying element of an I-joist.
- D. Neither alteration matters at this location because drain lines are lightweight.
Show answer & explanation
Answer: B
In an I-joist the top and bottom flanges resist the tension and compression produced by bending, so severing a flange destroys much of the member's capacity and calls for evaluation and repair per the manufacturer or an engineer. The web mainly resists shear, and manufacturers publish tables permitting holes of specific sizes at specific web locations. The reversed claim that the web is the primary bending element is the tempting error, since solid sawn lumber has no such distinction between its parts.56. Throughout the first floor of a home, the inspector notes that floors slope downward toward the center of the house, and interior doors near the middle of the home are out of square while doors at the perimeter operate normally. What is the most likely cause?
- A. Settlement or crushing of the central girder, its posts, or their footings supporting the middle of the floor structure.
- B. Uniform settlement of the entire perimeter foundation wall.
- C. Shrinkage of the exterior wall studs as the framing lumber dried after construction.
- D. Deflection of the roof ridge transferring load to the center of the floor system.
Show answer & explanation
Answer: A
Floor framing typically spans from the perimeter foundation to a central girder carried on posts and piers, so when that interior support settles or its members crush, the floors tilt toward the middle of the house and distort the door openings nearest the girder. Uniform perimeter settlement is the appealing wrong answer, but movement that is uniform around the outside would lower the whole structure evenly without creating a slope toward the center.57. An older hillside home has a tall crawlspace enclosed by short wood-framed stud walls that support the first floor. The inspector notes these walls have no structural sheathing or bracing. In a region subject to earthquakes, why is this significant?
- A. Unsheathed stud walls allow excessive airflow that will freeze plumbing in the crawlspace.
- B. The walls will transmit ground vibration into the living space, creating a nuisance condition.
- C. The stud spacing cannot be verified, so the floor load path is unknown.
- D. Unbraced cripple walls can rack and collapse sideways during ground shaking, allowing the house to fall off its foundation.
Show answer & explanation
Answer: D
Short cripple walls between the foundation and the floor framing act like a flexible story: without sheathing or diagonal bracing they have little resistance to horizontal racking, and during an earthquake they can hinge and collapse, dropping the house off its foundation. This is one of the most common seismic retrofit items in older hillside homes. The vibration-nuisance answer is a distractor because the concern is structural collapse, not comfort, and bracing rather than stud spacing is the missing element.58. A report notes that several floor joists beneath a bathroom have been 'sistered.' What does this term describe?
- A. Joists that were doubled at the time of original construction to carry a bearing wall above.
- B. Joists cut short and supported on metal hangers at both ends.
- C. Pairs of joists spliced end-to-end over a girder to extend their span.
- D. Reinforcing members fastened alongside existing joists, typically to strengthen weakened, damaged, or overspanned framing.
Show answer & explanation
Answer: D
Sistering means securing a new member directly alongside an existing joist so the two act together, and it is the standard field repair for joists weakened by decay, notching, or sagging. Because sistering is usually a remedial measure, its presence tells the inspector that a past problem existed and the repair's adequacy should be assessed. Joists doubled during original construction under a bearing wall are simply doubled framing, which is a design feature rather than the repair the term describes.59. When evaluating a conventionally framed roof, how do rafter ties and collar ties differ in function?
- A. Rafter ties prevent uplift at the eaves, while collar ties resist snow loads at midspan.
- B. The two terms are interchangeable names for the same horizontal framing member.
- C. Rafter ties in the lower third of the roof height resist the outward spread of the walls, while collar ties in the upper third resist separation of the rafters at the ridge under wind uplift.
- D. Collar ties carry the ceiling finish loads, while rafter ties serve only as nailing surfaces.
Show answer & explanation
Answer: C
Rafter ties, placed across the lower portion of opposing rafters or provided by the ceiling joists themselves, work in tension to keep the rafters from pushing the walls outward. Collar ties sit in the upper third of the attic and hold the rafter pairs together at the ridge when wind tries to pull the roof planes apart. Treating the terms as interchangeable is the common error; because they occupy different heights, one cannot substitute for the other's function.60. Along one side of a home, a downspout has discharged beside the foundation for years. The inspector probes the nearby wood sill plate with a screwdriver and the tool sinks easily into soft fibers. What should the inspector conclude and report?
- A. The sill shows probable moisture-related decay; the report should document the damage, the moisture source, and recommend repair and correction of the drainage.
- B. Softness in older sill lumber is normal seasoning and requires no comment.
- C. The sill has been chemically damaged by concrete leachate and only the discoloration should be noted.
- D. The condition is cosmetic because sills bear only compressive loads.
Show answer & explanation
Answer: A
A probing tool that penetrates easily indicates the wood has lost structural integrity, and the long-term roof runoff concentrated at the foundation supplies the moisture that drives fungal decay. Reporting must connect the damage to its cause so the correction addresses both the decayed member and the drainage defect. Dismissing the softness as normal aging is the dangerous error: sound framing lumber resists probing regardless of age, and decayed sills undermine the bearing of the entire wall above.61. An inspector observes several narrow, roughly vertical hairline cracks in a poured concrete foundation wall. The cracks show no lateral displacement, no offset, and no signs of water entry. How should these typically be characterized?
- A. As evidence of imminent wall failure requiring immediate shoring.
- B. As common shrinkage cracks that are typically minor, though sealing and monitoring may be suggested.
- C. As indications that the concrete was placed without any reinforcing steel.
- D. As proof of expansive soil pressure that will worsen each wet season.
Show answer & explanation
Answer: B
Concrete shrinks as it cures, and narrow vertical hairline cracks without displacement are an expected result of that shrinkage rather than a sign of structural distress. Sealing guards against future moisture seepage, and monitoring confirms the cracks remain stable. Expansive soil pressure is the tempting alternative, but lateral soil loading characteristically produces horizontal cracking or inward bowing, not fine vertical cracks with faces that remain in plane with each other.62. Homeowners report that a gap opens between their ceiling and the top of interior partition walls near the center of the house every winter, then closes in summer. The roof is framed with engineered trusses. What phenomenon does this describe?
- A. Frost heave lifting the interior footings each winter.
- B. Truss uplift, a seasonal arching of the bottom chord caused by differing moisture conditions between chords, which is primarily a cosmetic concern.
- C. Seasonal shrinkage of the interior wall studs due to furnace heat.
- D. Progressive failure of the truss plates that will eventually drop the ceiling.
Show answer & explanation
Answer: B
When the bottom chord of a truss is buried in warm dry insulation while the upper chords remain in cold humid attic air, differential moisture content makes the members change length at different rates and the bottom chord arches upward, lifting the ceiling off interior partitions. The movement reverses seasonally and is managed with flexible connections and trim details rather than structural repair. Interpreting it as plate failure is the alarming error; failed trusses do not cyclically self-correct each summer.63. A plumber has drilled a series of holes at mid-depth through several solid sawn floor joists to run supply lines. Compared with notches cut into the bottom edge of the same joists, why are these holes generally less damaging?
- A. Holes close up over time as the wood swells around the piping.
- B. Bending stresses are greatest at the top and bottom edges of a joist, so material removed near the neutral axis at mid-depth reduces capacity far less than material removed from an edge.
- C. Round openings concentrate stress more efficiently than square notches.
- D. Holes are always structurally insignificant regardless of size or location.
Show answer & explanation
Answer: B
A joist in bending works hardest at its extreme top and bottom fibers, while the material near the center of its depth carries comparatively little bending stress. A properly sized hole at mid-depth therefore removes low-stress material, whereas a bottom-edge notch cuts directly into the most highly stressed tension fibers and creates a stress concentration where cracks can start. The claim that holes are always insignificant overreaches: oversized or edge-adjacent holes still require evaluation.
Exterior, Roofing and Site
7 questions64. An inspector finds the finished grade sloping toward the foundation on one side of a house. What is the standard recommendation?
- A. Add soil against the siding to seal the joint
- B. No action, since gutters make grading irrelevant
- C. Regrade so the ground falls away from the foundation over the first several feet to shed surface water
- D. Install additional foundation vents on that side
Show answer & explanation
Answer: C
Positive drainage away from the foundation is the first line of defense against basement and crawlspace water, generally described as a fall of roughly six inches over the first ten feet. Piling soil against siding invites decay and pest entry, and gutters address roof water only, not surface runoff.65. What is the purpose of step flashing where a sloped roof meets a vertical wall?
- A. To direct water that runs down the wall out onto the roof surface, shingle by shingle
- B. To provide ventilation at the wall intersection
- C. To support the edge of the roof sheathing
- D. To hold the shingles down in high wind
Show answer & explanation
Answer: A
Step flashing consists of individual L-shaped pieces woven into each shingle course and lapped up the wall, so water is always carried over the material below it. A continuous strip of flashing or a bead of sealant in place of step flashing is a common defect that produces persistent leakage at the intersection.66. An inspector observes ice buildup at the eaves with water staining on the interior ceiling below. What is the underlying cause of an ice dam?
- A. Heat loss into the attic melting snow that refreezes at the colder eave, backing water up under the roofing
- B. Insufficient roof pitch alone
- C. Gutters that are too large for the roof area
- D. Shingles installed with too many fasteners
Show answer & explanation
Answer: A
Ice dams form when attic heat melts snow on the upper roof and the meltwater refreezes over the unheated eave, creating a dam that forces water beneath the shingles. The durable fix addresses air sealing, insulation and attic ventilation rather than only removing ice or adding heat cable.67. What is the function of a drip edge at the eave of a roof?
- A. To direct water off the roof edge and away from the fascia and sheathing
- B. To provide attic ventilation at the eave
- C. To secure the gutter to the fascia
- D. To act as the primary underlayment
Show answer & explanation
Answer: A
A drip edge is metal flashing at the eave and rake that breaks surface tension so water drips clear rather than wicking back onto the fascia and sheathing edge. Missing drip edge commonly produces rotted fascia and delaminated sheathing edges, findings an inspector correlates with the absent flashing.68. A brick veneer wall has small openings in the mortar joints at the base of the wall. What are these and what happens if they are sealed?
- A. Weep holes; sealing them traps water in the cavity behind the veneer and can cause deterioration
- B. Construction defects that should be filled with mortar
- C. Pest entry points that should always be sealed
- D. Ventilation for the interior living space
Show answer & explanation
Answer: A
Brick veneer is a drainage wall: water that penetrates the masonry runs down the back of the veneer onto flashing and exits through weep holes. Sealing them defeats the drainage plane, saturating the cavity, corroding ties and damaging sheathing, so an inspector notes sealed weeps as a defect.69. An inspector observes that a chimney's crown is cracked and the flashing is sealed only with roof cement. What are the implications?
- A. The crown is decorative and its condition is irrelevant
- B. The problem affects only the appearance of the chimney
- C. No implication, since roof cement is a permanent flashing material
- D. Water entry into the chimney structure and at the roof penetration, with deterioration likely to continue
Show answer & explanation
Answer: D
The crown sheds water off the top of the masonry, and cracks let water into the chimney where freeze-thaw action spalls brick and deteriorates the flue. Roof cement is a temporary patch that shrinks and cracks; proper flashing at a chimney uses step flashing on the sides with a cricket on the upslope side of a wide chimney.70. Downspouts discharge at the foundation with no extensions. What does the inspector recommend?
- A. Extend discharge away from the foundation so roof water is not concentrated at the perimeter
- B. Remove the gutters so water disperses evenly
- C. Connect downspouts to the sanitary sewer
- D. No action, since foundations are waterproof
Show answer & explanation
Answer: A
A roof concentrates a large volume at each downspout, so discharging at the foundation delivers far more water than the surrounding soil would otherwise receive. Extensions or buried leaders carry it away. Connecting roof drains to the sanitary sewer is generally prohibited because it overloads treatment systems.
Electrical Systems
21 questions71. Which conductor size is generally associated with a 20-ampere branch circuit in residential copper wiring?
- A. 12 AWG
- B. 14 AWG
- C. 10 AWG
- D. 16 AWG
Show answer & explanation
Answer: A
For residential copper branch circuits, 14 AWG pairs with 15 amperes, 12 AWG with 20 amperes and 10 AWG with 30 amperes. A 20-ampere breaker protecting 14 AWG conductors is an overfusing condition the inspector must report, because the conductor can overheat before the breaker trips.72. In which residential locations is ground-fault circuit interrupter protection generally required for receptacles?
- A. Only outdoor receptacles
- B. Bathrooms, kitchens, garages, unfinished basements, laundry areas and outdoors
- C. Bedrooms and hallways only
- D. Only receptacles serving dedicated appliance circuits
Show answer & explanation
Answer: B
GFCI protection targets shock hazard in wet, damp and grounded locations, so it covers bathrooms, kitchen countertops, garages, unfinished basements, crawlspaces, laundry areas and exterior receptacles. Arc-fault protection addresses fire risk from arcing and applies broadly to living-area circuits including bedrooms, which is a distinct requirement.73. An inspector finds two conductors terminated under a single breaker screw not rated for multiple conductors. What is this condition called?
- A. Double tapping, which can cause loose connections and overheating
- B. Bonding, which is a required practice
- C. Series wiring, which is normal in a panel
- D. A parallel feed, which increases capacity
Show answer & explanation
Answer: A
Most breaker terminals are listed for a single conductor, so two under one screw cannot both be reliably clamped, producing a loose connection that heats under load. The condition is reported for correction by a qualified electrician, typically by adding a breaker or using a listed pigtail.74. What is the significance of finding knob-and-tube wiring during an inspection?
- A. It is an obsolete system lacking an equipment grounding conductor, and it is damaged by contact with insulation, so it warrants evaluation
- B. It must always be reported as an immediate fire
- C. It is only a cosmetic concern
- D. It is fully equivalent to modern nonmetallic cable
Show answer & explanation
Answer: A
Knob-and-tube relies on air around the conductors for cooling and has no grounding conductor, so burying it in insulation causes overheating and it cannot serve grounded receptacles. It also commonly shows brittle insulation and improvised splices, and many insurers restrict coverage, so the inspector reports it for evaluation.75. A three-slot receptacle tests as having an open ground. What does this mean?
- A. The grounding slot is not connected, so the receptacle offers no equipment grounding path despite appearing grounded
- B. The hot and neutral conductors are reversed
- C. The receptacle has no power
- D. The circuit is overloaded
Show answer & explanation
Answer: A
An open ground means a three-prong receptacle presents a grounding slot with nothing behind it, which misleads users into plugging in equipment expecting protection that is absent. Reversed polarity is a separate defect where hot and neutral are swapped, energizing parts intended to be neutral.76. What is the distinction between grounding and bonding in a residential electrical system?
- A. Grounding connects the system to earth, while bonding connects metallic components together to create a low-impedance fault path
- B. Bonding applies only to gas piping
- C. Grounding connects components together and bonding connects to earth
- D. The two terms describe the same connection
Show answer & explanation
Answer: A
Grounding references the system to earth, stabilizing voltage and dissipating surges. Bonding joins metal parts, including piping and equipment enclosures, so a fault produces enough current to trip the overcurrent device rather than leaving metal energized. Both are required and serve different purposes.77. An inspector finds an electrical panel with unused openings where breakers have been removed, leaving the interior exposed. What is the concern?
- A. Openings are acceptable if the panel is in a locked room
- B. The condition affects only the panel's appearance
- C. The openings improve panel cooling and are beneficial
- D. Open knockouts expose energized parts and allow foreign objects to enter, and they must be closed with listed fillers
Show answer & explanation
Answer: D
Any opening in an enclosure must be closed with a listed blank or filler so energized components are not accessible and debris cannot enter. Related panel defects an inspector checks include missing dead front, inadequate working clearance in front of the panel, and conductors entering without proper connectors.78. Why is aluminum branch circuit wiring of certain vintages a reported concern?
- A. The concern is limited to the conductor's appearance
- B. Aluminum conductors cannot carry current at all
- C. Aluminum wiring is prohibited in all applications today
- D. Differential expansion and oxidation at terminations can loosen connections and cause overheating unless proper connectors are used
Show answer & explanation
Answer: D
Small-gauge aluminum branch wiring expands and contracts more than copper and forms a resistive oxide, so terminations loosen and heat over time. Remediation uses listed connectors or approved repair methods rather than replacement of all wiring. Larger aluminum conductors remain in common use for service entrances and feeders.79. In a residential panel, the inspector finds a 30-ampere breaker protecting a branch circuit wired with 14 AWG copper conductors. Why must this be reported as a defect?
- A. The conductor can overheat under loads the oversized breaker will not interrupt, creating a fire hazard hidden within walls.
- B. The breaker will nuisance-trip constantly because it senses the small conductor.
- C. A 30-ampere breaker physically cannot terminate a 14 AWG conductor.
- D. The combination merely wastes energy but poses no safety concern.
Show answer & explanation
Answer: A
Overcurrent protection exists to disconnect a circuit before its conductors exceed their safe temperature. A 14 AWG copper conductor is rated for a 15-ampere circuit, so pairing it with a 30-ampere breaker allows the wire to carry roughly double its intended current without tripping, cooking insulation inside concealed cavities. Breakers do not sense conductor size at all, which is precisely the problem: the device will sit closed while the undersized wire overheats.80. A receptacle tester shows 'hot and neutral reversed' at several outlets in a bedroom. What hazard does this wiring error create?
- A. Connected devices will draw excess current and trip the breaker frequently.
- B. The receptacles will deliver reduced voltage to sensitive electronics.
- C. Portions of a plugged-in device, such as a lamp socket shell, can remain energized even when the device switch is off, exposing users to shock.
- D. The condition is harmless because alternating current has no fixed polarity.
Show answer & explanation
Answer: C
With polarity reversed, the ungrounded conductor feeds the side of the device that is designed to stay at neutral potential. In a lamp, that leaves the exposed threaded shell of the socket energized even with the switch off, so a person changing a bulb can contact live parts. The idea that polarity is meaningless in alternating current is the classic misconception: although current alternates, the identified neutral is held near ground potential, and appliance safety design depends on it.81. Inside a detached garage's subpanel, fed from the house by a four-wire feeder, the inspector finds the neutral conductors and equipment grounding conductors terminated on the same bus, which is bonded to the panel enclosure. Why is this a reportable condition?
- A. Combining the conductors doubles the resistance of the neutral path and dims lighting.
- B. The arrangement is acceptable as long as the feeder includes four conductors.
- C. In a remote distribution panel the neutrals must be isolated from grounds; bonding them lets normal return current flow on grounding conductors and metal parts, energizing them under fault-prone conditions.
- D. Neutrals and grounds may share a bus anywhere except the service equipment.
Show answer & explanation
Answer: C
Neutral-to-ground bonding belongs only at the service equipment. In a downstream panel, tying the two systems together gives normal neutral current a parallel path over equipment grounding conductors, feeder ground, and metal enclosures, so surfaces meant to be dead can carry current continuously and a loose neutral can leave them energized. The distractor stating the four-wire feeder makes it acceptable inverts the logic: the fourth wire exists precisely so the neutral can remain isolated at the subpanel.82. What protection does an arc-fault circuit interrupter provide that a standard breaker does not?
- A. It limits voltage surges arriving from the utility during storms.
- B. It disconnects power when current leaks to ground through a person's body.
- C. It prevents overloads by measuring circuit temperature directly.
- D. It recognizes the electrical signature of dangerous arcing in damaged wiring or connections and opens the circuit to prevent fires.
Show answer & explanation
Answer: D
Arcing at a damaged cord, loose termination, or nail-pierced cable generates erratic current waveforms that may never exceed a standard breaker's trip threshold, yet the arc's heat can ignite surrounding materials. The interrupter's electronics distinguish these hazardous signatures from normal switching arcs and de-energize the circuit, targeting fire prevention. Leakage of current to ground through a person describes ground-fault protection, the tempting sibling technology, which addresses shock rather than arc-ignited fire.83. A 1950s home has original two-slot receptacles throughout. Modern three-prong appliances are plugged in using adapter plugs. How should the inspector handle this situation in the report?
- A. Describe the receptacles as ungrounded, explain that grounding-type appliances lack shock protection when used with adapters, and recommend evaluation for upgrading or accepted alternatives.
- B. Report the entire electrical system as unsafe and recommend the home be rewired before occupancy.
- C. Omit the observation because the receptacles were compliant when installed.
- D. Recommend replacing the two-slot devices with standard three-slot receptacles on the existing two-wire circuits.
Show answer & explanation
Answer: A
The inspector's duty is to describe present conditions and their implications: ungrounded circuits offer no equipment-grounding path, so adapters give three-prong appliances a false appearance of protection. Recommending evaluation lets an electrician weigh recognized remedies. Simply swapping in three-slot devices on two-wire circuits is the trap answer, because it creates open grounds that falsely advertise grounding; and staying silent because the wiring was once compliant ignores that inspections report current safety implications, not historical compliance.84. In a basement, a chest freezer is powered by a household extension cord that runs across the ceiling joists and is stapled in place, plugged into a receptacle at the far wall. Why is this condition reported?
- A. Stapling voids the cord's listing but the installation is otherwise sound.
- B. The freezer should instead be hardwired directly into the panel.
- C. Extension cords are not a substitute for permanent wiring; cords in sustained concealed use can be damaged by fastenings, overheat under continuous load, and create fire risk.
- D. Extension cords reduce voltage so severely that the freezer compressor cannot start.
Show answer & explanation
Answer: C
Flexible cords are designed for temporary, visible, movable use. Pressed into service as fixed wiring, they endure continuous loading and mechanical damage from staples that can crush strands and insulation, and they lack the protection and support required of permanent branch circuits, so overheating and fire become real risks. The suggestion to hardwire the appliance goes too far in the other direction; the correct remedy is a properly located receptacle on permanent wiring, which the report can leave to an electrician.85. During a panel inspection, the inspector identifies a breaker panel of a brand and vintage widely documented for breakers that can fail to trip under overload and fault conditions. The panel appears tidy and shows no visible damage. What is the appropriate reporting approach?
- A. Report no concern, since visible condition is the only basis for a visual inspection.
- B. Note the panel's age for informational purposes only.
- C. Test each breaker by shorting the circuits to verify tripping function.
- D. Identify the equipment, explain the documented failure-to-trip history and latent fire risk, and recommend evaluation by a qualified electrician.
Show answer & explanation
Answer: D
A latent hazard is one that does not announce itself visually: breakers that fail to trip protect nothing, yet look identical to functional ones. When equipment has a well-documented performance history of this kind, professional practice is to inform the client of the risk and refer evaluation and probable replacement to an electrician. Deliberately shorting circuits to test breakers is far outside a home inspection's non-destructive scope and would itself be dangerous to the inspector and the property.86. In an attic, the inspector finds an electrical junction box with energized splices inside but no cover plate, partially buried in insulation. Why does this require correction?
- A. Junction boxes are prohibited in attics and the wiring must be rerouted.
- B. The missing cover allows accessible energized connections and lets heat or sparks from a failing splice reach combustible surroundings, so a cover must be installed.
- C. An open junction box mainly causes voltage drop at the splices, which makes lights on the circuit flicker and dim.
- D. The box only needs a cover if the attic is used for storage.
Show answer & explanation
Answer: B
Covers complete the enclosure that contains sparks, arcs, and heat from a deteriorating splice and keep people and materials away from energized parts. An open box buried in insulation surrounds potential ignition sources with fuel. Junction boxes are permitted in attics when accessible, so rerouting is unnecessary; and the duty to enclose connections does not depend on whether anyone stores belongings nearby, because the fire pathway exists regardless of occupant habits.87. While inspecting the exterior, the inspector sees that tree branches are in contact with the overhead service drop conductors, and the insulation on one conductor appears abraded where the limbs rub. What should the report say?
- A. Recommend the homeowner prune the branches away from the conductors as routine maintenance.
- B. Note the vegetation only under landscaping observations since conductors are insulated.
- C. Document the contact and abrasion as a hazard and recommend the condition be addressed, noting that service drop repairs typically involve the utility.
- D. Ignore the condition because the service drop belongs to the utility and is outside the inspection.
Show answer & explanation
Answer: C
Abraded conductor insulation on a service drop can expose energized surfaces at the treetops and eventually cause faults or dropped lines, so the condition is a safety issue worth documenting with a referral, and clients should know the serving utility generally maintains the drop. Advising the homeowner to prune limbs personally is the dangerous distractor: cutting branches in contact with energized service conductors risks electrocution and is work for the utility or qualified professionals.88. A ground-fault circuit interrupter receptacle in a bathroom trips immediately every time its reset button is pressed, with nothing plugged into the circuit. What does this behavior most likely indicate?
- A. Normal operation confirming the internal test mechanism works.
- B. The receptacle is wired to an oversized breaker and is protecting itself.
- C. A ground fault exists in the downstream wiring or the device itself has failed, and evaluation by an electrician is needed.
- D. Household voltage is slightly high, and the device will stabilize over time.
Show answer & explanation
Answer: C
A ground-fault device that will not hold its reset is telling the inspector that leakage current is present somewhere on the protected wiring, or that the interrupter's internal electronics have failed. Either way the circuit cannot be relied on, and diagnosis belongs to an electrician. Mistaking the behavior for a successful self-test is the trap: a healthy device resets and holds, and only trips when the test button is pressed or an actual fault occurs on the circuit.89. A four-bedroom home with an electric range, electric clothes dryer, and central air conditioning is served by an original 60-ampere electrical service. How should the inspector treat this finding?
- A. Consider it adequate as long as no breakers tripped during the inspection.
- B. Report it as acceptable because service size is a utility decision.
- C. Recommend adding a second panel to split the existing service.
- D. Report that the service capacity appears inadequate for the home's electrical loads and recommend evaluation by a qualified electrician.
Show answer & explanation
Answer: D
Major appliances such as ranges, dryers, and air conditioning impose sustained loads that can exceed a small legacy service even when nothing trips during a brief site visit, so the inspector reports the apparent mismatch between capacity and demand and refers sizing analysis to an electrician. Relying on the absence of tripped breakers is the appealing error, because a short inspection never exercises simultaneous peak loads, and chronic near-capacity operation stresses equipment without necessarily tripping the main.90. A home with 1970s-era aluminum branch-circuit wiring shows evidence of past remediation at devices. Which repair approach is generally recognized as an acceptable correction for aluminum branch wiring hazards?
- A. Wrapping existing terminations with electrical tape to insulate them.
- B. Joining short copper conductor pigtails to the aluminum wire using connectors specifically rated and listed for copper-to-aluminum connections, then terminating the copper at devices.
- C. Tightening all device screws firmly onto the aluminum conductors at each outlet.
- D. Coating the aluminum conductor ends with solder before reconnecting them.
Show answer & explanation
Answer: B
The recognized remediations connect a copper pigtail to each aluminum conductor with a device specifically listed for joining the two metals, so that the aluminum's tendency to oxidize, creep, and loosen is contained inside an engineered connector rather than at a device terminal. Simply retightening screws is the tempting answer because looseness is the symptom, but aluminum's cold-flow under pressure means retightened terminations loosen again, and tape or solder does nothing to address the underlying connection metallurgy.91. Occupants describe lights in part of the house growing suddenly brighter while lights elsewhere dim whenever the air conditioner or dryer starts, and some electronics have failed unexpectedly. What condition should the inspector suspect?
- A. A loose or deteriorated service neutral connection causing voltage imbalance between the two halves of the 240-volt system.
- B. Undersized branch circuit conductors throughout the home.
- C. A failed breaker that is limiting current to half the panel.
- D. Static buildup in the ductwork discharging into the wiring.
Show answer & explanation
Answer: A
Residential 240-volt services balance two opposite legs across a shared neutral; when that neutral connection deteriorates, the midpoint floats, so voltage on one leg rises while the other falls as large loads shift the balance. Brightening lights are the giveaway, since simple overloads only cause dimming. This is an urgent hazard because sustained overvoltage destroys equipment and can start fires. Undersized branch wiring, the tempting alternative, would cause localized dimming under load but never the simultaneous brightening on the opposite leg.
Interiors, Insulation and Professional Practice
9 questions92. In a cold climate, on which side of wall insulation should a vapor retarder generally be installed?
- A. Vapor retarders are not used in wall assemblies
- B. Both sides, to seal the cavity completely
- C. The warm, interior side, so moisture does not condense within the assembly
- D. The cold, exterior side
Show answer & explanation
Answer: C
Water vapor moves from warm humid air toward cold, so in a heating climate the retarder goes on the interior face to stop vapor before it reaches a cold surface where it would condense. Sealing both sides traps any moisture that does enter with no path to dry, which is why double vapor barriers cause damage.93. An inspector finds attic insulation covering the soffit vents. What is the consequence?
- A. Blocked intake air defeats attic ventilation, raising moisture and heat and contributing to ice dams
- B. Improved thermal performance with no drawback
- C. No effect, since ridge vents work without intake
- D. Reduced risk of wind-driven rain entry with no other effect
Show answer & explanation
Answer: A
Attic ventilation depends on low intake at the soffits and high exhaust at the ridge, so blocking intake stalls the airflow the ridge vent needs. Baffles are installed to hold insulation back at the eave while maintaining full depth over the ceiling, and the finding is commonly linked to ice damming and attic condensation.94. What does the R-value of an insulation material express?
- A. Resistance to heat flow, with higher values indicating greater resistance
- B. Resistance to moisture penetration
- C. Rate of air leakage through the assembly
- D. Resistance to fire spread
Show answer & explanation
Answer: A
R-value measures thermal resistance and is additive across layers of an assembly. It says nothing about air leakage or moisture, which is why air sealing is a separate and often more consequential measure, and compressed insulation delivers less than its nominal R-value because the value depends on installed thickness.95. An inspector observes that the door between an attached garage and the house is a hollow-core door with no self-closing device. What is the concern?
- A. Hollow-core doors are prohibited anywhere in a dwelling
- B. The door will not provide adequate sound insulation
- C. The garage-to-house separation is compromised, allowing fire and vehicle exhaust to enter the dwelling
- D. The concern is limited to the door's durability
Show answer & explanation
Answer: C
The garage is treated as a hazardous area, so the separation requires a rated or solid door that closes and latches, along with a sealed wall and ceiling assembly. An open or hollow path lets carbon monoxide from a running vehicle and products of a garage fire into living space, so the finding is a safety report.96. An inspector measures a stairway where the riser heights vary by more than three quarters of an inch between the tallest and shortest riser. Why does this matter?
- A. It reduces the structural capacity of the stringers
- B. It affects only the appearance of the stairway
- C. It has no safety significance if a handrail is present
- D. Inconsistent riser height is a trip hazard because users adapt to a rhythm and an outlier step causes falls
Show answer & explanation
Answer: D
Stair safety depends on uniformity, because people climb by feel rather than by looking at each step, and a single differing riser produces a disproportionate share of falls. Related findings include missing or non-graspable handrails, guards permitting passage of a four-inch sphere, and inadequate headroom.97. A finished basement bedroom has no window large enough for emergency escape. What should the inspector report?
- A. The room lacks required emergency escape and rescue opening, which is a life-safety concern for a sleeping room
- B. Nothing, since the basement has a stairway to the exterior
- C. Only that natural light is insufficient
- D. That the room cannot be used for storage
Show answer & explanation
Answer: A
Sleeping rooms require an emergency escape and rescue opening meeting minimum clear dimensions and sill height, with a window well and ladder where below grade, because occupants may need to exit or be rescued when the stairway is blocked by fire. Reporting a below-grade room marketed as a bedroom without one is a core safety observation.98. Under typical home inspection standards of practice, which activity is outside the scope of a general home inspection?
- A. Dismantling equipment or performing destructive testing to expose concealed conditions
- B. Operating readily accessible installed systems using normal controls
- C. Visually examining readily accessible components
- D. Reporting observed material defects
Show answer & explanation
Answer: A
A home inspection is a non-invasive visual examination of readily accessible systems and components, operated by normal controls. It is not a code compliance inspection, an insurance or warranty evaluation, or an engineering analysis, and it does not include dismantling equipment or opening finished surfaces.99. A client asks the inspector to perform the repairs identified in the inspection report. What is the professional concern?
- A. Repairing property one has inspected creates a conflict of interest and is generally prohibited by codes of ethics
- B. There is no concern, since the inspector knows the property best
- C. The concern applies only if the repairs exceed a dollar threshold
- D. The concern is resolved by charging a discounted rate
Show answer & explanation
Answer: A
An inspector who profits from repairs has an incentive to find or overstate defects, so ethics provisions bar repairing property the inspector has inspected, typically for a stated period. Related prohibitions cover accepting compensation for referrals and inspecting property in which the inspector has an interest.100. An inspector cannot access a portion of the attic because of low clearance and stored belongings. How should this be handled?
- A. Omit any mention of the area
- B. Move the stored belongings and proceed
- C. Assume the inaccessible area matches the accessible portion
- D. Report the area as not inspected, state the reason, and note that conditions there are unknown
Show answer & explanation
Answer: D
Standards require disclosing what was not inspected and why, so the client understands the report's limits. Assuming conditions or silently omitting an area exposes the inspector to liability for a defect that was never observed, and moving a client's or seller's belongings is outside the inspector's role.
Showing 100 of 186 questions.
2026 statistics
Key facts: Home Inspector exam
- Questions
- 175
- Time limit
- 4h
- Passing score
- 500 (scaled, 200-800)
- Exam fee
- $225
- Governing body
- EBPHI
This free Home Inspector practice test has 186 original questions written to EBPHI's official content outline, last checked against it on July 18, 2026, 100 of them listed on this page and the rest loaded by the drill. Every question shows a worked explanation, and nothing here requires a signup.
The questions are grouped under nine outline areas: State Law, Property Ownership, Contracts, Heating, Ventilation and Air Conditioning, Plumbing Systems, Structure, Foundation and Framing, Exterior, Roofing and Site, Electrical Systems and Interiors, Insulation and Professional Practice.
As of 2026, the Home Inspector exam fee is $225.
How the Home Inspector practice bank covers the outline
186 questions across 9 outline areas — the same areas the page's sections use.
Counts are the live question bank, grouped by the outline area each question was written to.
Exam format and study resources
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Official sources
Primary documents used to verify the exam details shown on this page.
- National Home Inspector Examination OverviewEBPHIhomeinspectionexam.org
- NHIE Content Outline and Exam PreparationExamination Board of Professional Home Inspectors (EBPHI)nationalhomeinspectorexam.org
- NHIE Test PoliciesExamination Board of Professional Home Inspectors (EBPHI)nationalhomeinspectorexam.org
- NHIE Frequently Asked QuestionsExamination Board of Professional Home Inspectors (EBPHI)nationalhomeinspectorexam.org
- National Home Inspection ExamAmerican Society of Home Inspectors (ASHI)homeinspector.org
- National Home Inspector Examination HomeExamination Board of Professional Home Inspectors (EBPHI)nationalhomeinspectorexam.org
Last verified against the official exam content outline:
Frequently asked questions
Do these free NHIE practice questions match the real exam?
They are written in the same multiple-choice format as the real NHIE and cover the same content areas: roof, exterior, structure, electrical, HVAC, plumbing, interior, insulation, and ventilation, plus reporting and ethics. They are not actual exam questions, which are confidential, but they target the same knowledge and question style. Practicing with them builds the pattern recognition the real exam rewards.
How many practice questions should I do before the NHIE?
Aim to work through several hundred practice questions before test day, ideally in short daily sessions rather than one long cram. Since the real exam presents 200 questions in a single sitting, do at least a few full-length timed sets so the volume and pacing feel familiar. Daily practice of 25-50 questions over a few weeks beats a single marathon session.
How should I use the answer explanations?
Read the explanation for every question, including the ones you got right, because a correct guess is still a knowledge gap. When you miss a question, note which system or rule it tested and revisit that topic before your next session. The explanations are where most of the learning happens; the score itself is just a signal.
How do I know I'm ready to sit for the NHIE?
You're likely ready when you consistently score comfortably above the passing threshold on full-length timed practice sets across multiple sessions, not just once. Also check that no single content area drags well below the others, since the exam samples every system. If you're finishing timed sets with time to spare and your misses are scattered rather than clustered, that's a strong readiness signal.
Are these NHIE practice questions really free?
Yes, the practice questions on this page are completely free, and you don't need to create an account or enter an email to use them. You can retake them as many times as you like, and the explanations are included with every question. Free access lets you diagnose your weak areas before deciding whether you need any paid study materials.