National Home Inspector Exam (NHIE) — All Questions

On a sloped asphalt-shingle roof, what is the primary purpose of the metal or plastic drip edge installed along the eaves and rakes?

• a.To increase the roof's fire resistance rating
• b.To direct runoff into the gutter and keep water from wicking back onto the fascia and sheathing✓
• c.To hold the shingles down during high winds
• d.To provide attic ventilation at the roof edge

A drip edge extends water past the fascia so runoff falls into the gutter rather than wicking behind it and rotting the sheathing and fascia. It is a moisture-management detail, not a structural, ventilation, or fire component.

During an exterior inspection, the finished grade slopes toward the foundation on one side of the house. Why is this a defect worth reporting?

• a.It reduces the home's curb appeal only
• b.It violates the color scheme of the siding
• c.It channels surface water toward the foundation, promoting basement/crawlspace moisture and settlement✓
• d.It prevents proper installation of gutters

Grade should slope away from the foundation (commonly about 6 inches of fall within the first 10 feet) so surface water drains away. Negative slope directs water toward the foundation, causing intrusion, hydrostatic pressure, and potential settlement.

In a home's electrical panel, why is it a defect to find two circuit conductors (a 'double tap') under a single breaker terminal not rated for two wires?

• a.The terminal may not clamp both wires securely, causing loose connections, arcing, and overheating✓
• b.It doubles the available amperage on the circuit
• c.It improves grounding of the panel
• d.It is required by code for kitchen circuits

Most breakers are listed for a single conductor; forcing two under one lug can leave one wire loose, producing high-resistance connections that arc and overheat. Double taps are only acceptable on breakers specifically listed for two conductors.

What is the main safety function of the temperature and pressure relief (TPR) valve on a residential water heater?

• a.To regulate the water temperature at the faucet
• b.To reduce sediment buildup in the tank
• c.To conserve energy by limiting heating cycles
• d.To discharge water and relieve pressure if temperature or pressure exceeds safe limits, preventing tank rupture✓

A TPR valve opens if the tank exceeds roughly 210 degrees F or 150 psi, releasing pressure so the tank cannot explode. Its discharge pipe must run down to near the floor so escaping hot water cannot scald anyone.

An inspector finds no anti-tip bracket on a freestanding kitchen range. Why is this reported as a safety concern?

• a.The range will not heat evenly without it
• b.The range can tip forward if weight is applied to an open oven door, risking injury and burns✓
• c.The bracket is required for electrical grounding
• d.It prevents gas leaks at the supply line

An anti-tip bracket anchors the rear of the range so it cannot tip forward when a child stands or leans on the open oven door. Missing brackets are a common, easily corrected safety defect.

Why should the discharge pipe of a residential sump pump or condensate line not terminate directly into the sanitary sewer or a drain without an approved air gap?

• a.To prevent cross-connection that could allow sewage or contaminated water to back-siphon into the system✓
• b.To make the pump run more quietly
• c.To reduce the electrical load on the pump
• d.To keep the pipe from freezing in winter

A direct connection without an air gap creates a cross-connection where a backup could siphon contaminated water into clean systems. An air gap physically separates the discharge from the receiving drain, preventing back-siphonage.

In a vented attic, what problem is most directly caused by inadequate balance between soffit (intake) and ridge (exhaust) ventilation?

• a.Excessive foundation settlement
• b.Increased water pressure at fixtures
• c.Moisture buildup and heat accumulation leading to condensation, mold, and premature shingle aging✓
• d.Higher risk of electrical short circuits in the panel

Balanced intake at the soffits and exhaust at the ridge lets air wash the underside of the roof, carrying away heat and moisture. Without it, condensation and heat build up, promoting mold, rot, and shortened shingle life.

What is the purpose of the required clearance between combustible framing and a masonry fireplace or metal flue as specified by the manufacturer and code?

• a.To allow room for future chimney expansion
• b.To improve the draft of the fireplace
• c.To leave space for insulation to be added later
• d.To prevent heat transfer from igniting nearby wood framing over time✓

Required clearances keep combustible framing far enough from hot flue surfaces that radiant and conductive heat cannot pyrolyze and ignite the wood. Insulation must never be packed into these clearance spaces, which would trap heat against the framing.

On a forced-air furnace, why is a cracked heat exchanger considered a serious safety defect?

• a.It reduces the airflow through the ducts only
• b.It can allow combustion gases, including carbon monoxide, to mix with the conditioned air distributed through the home✓
• c.It causes the blower motor to overheat
• d.It only affects the furnace's energy efficiency

The heat exchanger separates combustion gases from the breathing air moved by the blower. A crack can leak carbon monoxide into the supply air, so a suspected cracked exchanger warrants immediate evaluation and shutdown.

Why is a bathroom exhaust fan that vents into the attic rather than to the building exterior reported as a defect?

• a.It dumps moist air into the attic, causing condensation, mold, and potential rot of framing and insulation✓
• b.It makes the fan louder than normal
• c.It reduces the fan's electrical efficiency
• d.It is acceptable as long as the attic is ventilated

Exhaust fans must discharge to the exterior; venting into the attic deposits humid air that condenses on cold framing and sheathing. The result is mold, wet insulation, and wood decay, so the duct must be extended through the roof or wall.

When inspecting a deck, why is the method of attaching the ledger board to the house of particular concern?

• a.It affects the appearance of the deck boards
• b.It determines the color of the flashing
• c.Improper ledger attachment (e.g., nails instead of through-bolts/lags with flashing) is a leading cause of catastrophic deck collapse✓
• d.It changes how the deck drains rainwater

The ledger transfers much of the deck's load to the house, and failures here cause sudden collapses. Proper attachment uses lag screws or through-bolts (not nails) with flashing to keep water out of the connection.

What does the presence of efflorescence (a white crystalline deposit) on a basement foundation wall indicate to an inspector?

• a.The concrete is losing structural strength rapidly
• b.The wall was recently painted
• c.There is an electrical fault behind the wall
• d.Water has been moving through the masonry, leaving mineral salts as it evaporates✓

Efflorescence is mineral salt left behind as water passes through masonry and evaporates at the surface. It is evidence of past or present moisture intrusion and should prompt a look at grading, drainage, and waterproofing.

Why should ground-fault circuit interrupter (GFCI) protection be present at receptacles serving kitchens, bathrooms, garages, and exterior locations?

• a.To increase the voltage available at those outlets
• b.To quickly cut power when it detects current leaking to ground, reducing shock hazard in wet areas✓
• c.To prevent the circuit breaker from tripping
• d.To improve appliance energy efficiency

GFCIs sense small imbalances between hot and neutral current that indicate leakage through a person and trip within milliseconds. This protection is required where water raises shock risk, such as kitchens, baths, garages, and outdoors.

In a crawlspace with exposed soil, why does an inspector recommend a vapor barrier (ground cover) over the earth?

• a.To reduce moisture migrating from the soil into the crawlspace, limiting wood decay and mold✓
• b.To provide additional structural support to the floor joists
• c.To improve the crawlspace's fire rating
• d.To serve as a walking surface for future repairs

Bare soil continuously releases moisture into the crawlspace, feeding mold and rot in the wood structure above. A vapor barrier over the ground greatly reduces this moisture load and protects the framing and insulation.

When prioritizing findings in a report, which of the following would typically be flagged as an immediate safety hazard rather than routine maintenance?

• a.A few missing balusters on a rarely used fence
• b.Minor peeling paint on a garage soffit
• c.An exposed, energized electrical conductor within reach in the garage✓
• d.A slightly clogged gutter downspout

Prioritization ranks defects by risk to safety and by consequence of failure. An exposed live conductor poses an immediate shock hazard and outranks cosmetic or minor maintenance items, so it should be clearly called out as urgent.

A well-written home inspection report finding should generally include which combination of elements?

• a.The location and description of the defect, its implication, and a recommended action✓
• b.Only the inspector's personal opinion of the seller
• c.A guaranteed repair cost estimate for every item
• d.The names of past owners of the property

Clear findings state what was observed and where, why it matters (the implication), and what the client should do next. This structure lets clients understand and act on the issue without the inspector guaranteeing costs or making unrelated claims.

An inspector observes staining on a ceiling but the attic above is dry at the time of inspection. What is the most defensible way to report this?

• a.State definitively that the roof is leaking and must be replaced
• b.Ignore it because the attic is currently dry
• c.Assure the client the stain is purely cosmetic and harmless
• d.Describe the stain, note that active moisture was not observed at the time, and recommend monitoring or further evaluation✓

Reports should describe what was actually observed and avoid overstating conclusions the evidence does not support. Noting the stain, the absence of active moisture at inspection, and a recommendation to monitor or evaluate is accurate and protects both client and inspector.

Why should an inspection report distinguish between a 'deficiency' and an item that is simply near the end of its service life?

• a.Because near-end-of-life items never need to be reported
• b.So the client can prioritize actual defects versus planning for eventual, expected replacement✓
• c.Because service life has no bearing on a home purchase
• d.So the inspector can avoid inspecting older components

A deficiency is something not performing as intended, while an aging component may still function but warrant future budgeting. Distinguishing them helps clients separate urgent repairs from planned capital expenses.

When evaluating multiple defects in the same system, what is the value of identifying a likely underlying cause rather than only listing symptoms?

• a.It lets the inspector shorten the report by omitting symptoms
• b.It guarantees the repair will be inexpensive
• c.It helps the client and repair professionals address the root problem instead of treating each symptom in isolation✓
• d.It removes the need to recommend further evaluation

Several symptoms often stem from one root cause, such as multiple moisture stains traced to poor drainage. Pointing toward the underlying cause guides more effective, lasting repairs than treating each symptom separately.

Under a typical home inspector Standard of Practice, which of the following best describes the nature of a general home inspection?

• a.A visual, non-invasive examination of readily accessible systems and components to identify observed defects✓
• b.A code-compliance audit that certifies the home meets all current building codes
• c.A guarantee or warranty that no problems will arise after purchase
• d.A destructive investigation that includes opening walls and dismantling equipment

Standards of Practice define a home inspection as a visual, non-invasive survey of accessible systems, reporting defects observed at the time. It is not a code inspection, a warranty, or a destructive investigation, and reports should reflect those limits.

A code of ethics for home inspectors would most clearly prohibit which of the following?

• a.Recommending the client seek a specialist for further evaluation
• b.Describing observed defects plainly in the report
• c.Declining an inspection outside the inspector's competence
• d.Accepting a referral fee from a contractor in exchange for steering repair work to that contractor✓

Ethics codes prohibit conflicts of interest that could compromise objectivity, such as accepting compensation for directing repair business. Referring clients to specialists or declining work beyond one's competence is encouraged, not prohibited.

Why do professional standards generally bar a home inspector from also performing or offering to perform repairs on a home they inspected for the same client within a defined period?

• a.Because inspectors are legally forbidden from ever doing repair work
• b.Because it creates a conflict of interest that can bias the inspection toward finding work to sell✓
• c.Because repairs are always outside an inspector's skill set
• d.Because the client would have to pay twice for the same service

If an inspector can profit from repairs, there is an incentive to exaggerate or invent defects, undermining the objectivity clients rely on. Standards therefore restrict combining inspection with repair work to preserve impartiality.