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TENNESSEE HOME INSPECTOR LICENSE
EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2025
- What is the primary purpose of a home inspection? To provide an objective visual assessment of the condition of a home's major systems and components
- This helps the client understand the current condition before purchase or sale.
- Which of the following is NOT typically included in a standard home inspection? Testing for radon gas
- Radon testing usually requires specialized equipment and is often a separate service.
- What is the minimum acceptable slope for grading away from a foundation to prevent water intrusion? 6 inches within the first 10 feet
- Proper grading directs water away, reducing the risk of basement leaks and foundation issues.
- When inspecting a roof, what is a common sign of damage to asphalt shingles? Curling or buckling shingles
- This indicates age or poor ventilation and can lead to leaks.
- Which type of foundation is most susceptible to moisture intrusion? Basement foundation
- Basements are below ground level, increasing risk for water seepage.
- What is the typical spacing for floor joists in residential construction? 16 inches on center
- 16" OC is a standard spacing for framing to provide proper support.
- What electrical component is designed to protect a circuit from overload by automatically shutting off power? Circuit breaker
- Circuit breakers trip to prevent overheating and potential fires.
- When inspecting a gas furnace, what is a critical safety concern? Presence of carbon monoxide
- Improper combustion or ventilation can produce dangerous carbon monoxide gas.
15.What tool is typically used to check for moisture intrusion in walls? Moisture meter
- Detects moisture levels that are not visible to the naked eye. 16.What is the minimum thickness of drywall used on interior walls? 1/2 inch
- Standard drywall thickness for walls is 1/2 inch. 17.What is the primary function of weep holes in brick veneer walls? Allow moisture to escape from behind the brick
- Prevents moisture buildup and damage. 18.What is a common defect found in older wood windows? Rotting sills or frames
- Wood exposed to moisture deteriorates over time. 19.How far should a deck be from the ground to prevent rot? At least 18 inches
- Allows air circulation and reduces moisture accumulation. 20.What type of ventilation is required in an attic space? Soffit vents and ridge vents
- These allow continuous airflow to reduce moisture and heat buildup. 21.What is the purpose of an expansion tank in a hot water heating system? To accommodate water expansion as it heats
- Prevents pressure buildup and damage to the system.
22.What is the typical thickness of concrete slabs used for residential floors? 4 inches
- Standard slab thickness to support residential loads. 23.What does the presence of efflorescence on a basement wall indicate? Water intrusion and salt deposits
- White powdery deposits signal moisture seepage. 24.Which type of vent pipe is used to allow sewer gases to escape above the roof? Plumbing vent stack
- Prevents buildup of sewer gases inside the home. 25.What is the maximum spacing allowed for balusters on a deck railing? 4 inches
- To prevent small children from slipping through. 26.What should be the condition of the caulking around windows and doors? Intact and flexible
- Prevents air and water infiltration. 27.When inspecting an electrical panel, what is a sign of potential hazard? Double-tapped breakers
- Multiple wires under one breaker can cause overheating. 28.What is the purpose of grounding in an electrical system? To safely discharge electricity into the earth
- Reduces risk of shock or fire.
36.What is the main concern with knob-and-tube wiring in older homes? Lack of grounding and insulation deterioration
- Presents fire and shock hazards. 37.How often should a septic system be inspected? Every 3 years
- To ensure proper function and avoid failures. 38.What is the function of flashing around windows and doors? To prevent water intrusion
- Redirects water away from openings. 39.What is a common sign of inadequate attic insulation? Ice dams on the roof in winter
- Heat loss melts snow unevenly causing ice buildup. 40.What is the minimum distance required between a gas appliance and a combustible surface? 6 inches
- To prevent fire hazards. 41.What type of glass is often used in windows for safety reasons? Tempered glass
- Breaks into small, less harmful pieces. 42.What is the typical thickness of exterior siding on a residential home? 5/8 inch
- Varies, but this is a common thickness for wood or fiber cement siding.
43.What is the first step when inspecting a crawl space? Check for standing water and moisture conditions
- Moisture is a major concern in crawl spaces. 44.What is a common cause of cracks in drywall? Settlement of the house or framing movement
- Minor cracks often result from natural shifting. 45.What tool is used to test the operation of an electrical outlet? Outlet tester or multimeter
- Measures voltage and wiring integrity. 46.What is the minimum number of exits required for a basement? One egress window or door
- Required for safety and emergency escape. 47.Which of the following materials is NOT commonly used for sewer lines? PVC
- Actually, PVC is common, so the correct answer would be cast iron or clay pipe depending on context; this question needs clarity. [Adjusting:]
- Which of the following materials is NOT typically used for sewer lines in older homes? PVC
- Older homes more often have clay or cast iron sewer lines; PVC is newer.
- This type fills irregular spaces and provides good thermal resistance. 55.When inspecting exterior siding, what is a typical defect to look for? Cracking, warping, or loose panels
- Damaged siding can allow water intrusion and pest entry. 56.What device should be installed in homes with electrical systems over 100 amps to protect against electrical faults? Arc fault circuit interrupter (AFCI)
- AFCIs detect dangerous arcing conditions and prevent electrical fires. 57.Which of the following is a common indicator of plumbing leaks? Stains or mold growth on ceilings or walls
- Leaks cause discoloration and mold due to moisture accumulation. 58.What is the minimum clearance between a gas appliance vent and combustible materials? 6 inches
- Maintaining clearance prevents heat damage and fire hazards. 59.What should be inspected on a chimney cap? Integrity of the cap and absence of debris or animal nests
- A damaged or missing cap can allow water and animals into the chimney. 60.What is the typical size for a residential sewer cleanout? 4 inches in diameter
- Allows access for clearing blockages.
61.Which foundation type usually requires perimeter drainage systems? Basement foundations
- Drain tiles or French drains reduce water pressure on basement walls. 62.What does the term “pitch” refer to in roofing? The slope or steepness of the roof
- Pitch affects water runoff and roofing material selection. 63.What is the proper placement of smoke detectors in a residence? On every level and inside sleeping areas
- Proper placement ensures early detection of fires. 64.What is a common sign of inadequate attic ventilation? Excessive heat buildup and moisture condensation
- Leads to premature roof damage and mold growth. 65.What is the function of a chimney flue liner? To protect the chimney walls and contain combustion byproducts
- Liners improve safety and efficiency. 66.What is the maximum spacing between wall studs in residential construction? 16 or 24 inches on center
- Depends on design but 16" OC is most common. 67.Which material is NOT suitable for use in exterior window frames? Untreated wood
- Prone to rot and warping if exposed to weather.
75.What is the minimum width for a residential hallway? 36 inches
- Ensures accessibility and safety. 76.What is the purpose of a chimney damper? To control airflow and close the flue when not in use
- Prevents heat loss and drafts. 77.When inspecting plumbing supply lines, what is a sign of concern? Corrosion or leaks at joints
- Could lead to water damage or failure. 78.What is the minimum height of guardrails on stairs? 34 inches
- Building codes require guardrails to prevent falls. 79.Which of the following is NOT a common cause of roof leaks? Properly installed flashing
- Flashing is designed to prevent leaks, not cause them. 80.What is the common spacing for ceiling joists in residential construction? 16 inches on center
- Supports ceiling loads and fixtures. 81.What is the function of a backflow preventer in plumbing? To prevent contaminated water from flowing back into the potable supply
- Ensures water safety.
82.What type of window is characterized by a sash that slides vertically? Single-hung or double-hung window
- Common types in residential construction. 83.What is the minimum clearance between the ground and the bottom of a wooden deck? 18 inches
- Allows air circulation and reduces rot risk. 84.Which of the following is a key safety feature of modern electrical systems? Ground-fault circuit interrupters (GFCIs)
- Protects people from electric shocks in wet locations. 85.What is the primary purpose of flashing around chimneys? To prevent water penetration at the chimney-roof junction
- Protects structural integrity. 86.What is the minimum size of an egress window for a basement bedroom? 5.7 square feet of net clear opening
- Required for safe emergency escape. 87.What is the typical thickness of fiberglass batt insulation? 3.5 inches for 2x4 walls
- Provides R-13 insulation value. 88.What should be the condition of attic access doors? Insulated and sealed
- Prevents heat loss and air leakage.
96.What tool is used to measure the thickness of paint or coatings? Coating thickness gauge
- Assesses layer thickness and surface conditions. 97.What is the function of soffit vents? To allow cool air to enter the attic
- Works with ridge vents for balanced ventilation. 98.What is the purpose of a drip cap above windows? To divert water away and prevent infiltration
- Protects window framing. 99.What type of foundation wall is typically insulated on the interior? Basement walls
- Helps retain heat in living spaces.
- What is a common cause of electrical outlets not working? Tripped circuit breaker or blown fuse
- First thing to check during troubleshooting.
- What is the minimum clearance between a water heater and combustibles? 5 inches
- Which type of door hardware is recommended for exterior doors for security? Deadbolt lock
- Provides better security than spring locks.
- What is the standard width for exterior residential doors? 36 inches
- Allows easy access and furniture movement.
- What is the typical lifespan of a galvanized steel plumbing pipe? 40 to 50 years
- Prone to corrosion over time.
- What is the primary purpose of a weep screed in stucco walls? To allow moisture to drain from the wall assembly
- Prevents water damage and mold.
- What type of window glass reduces heat loss? Double-pane insulated glass
- Improves energy efficiency.
- What is the minimum slope required for a drain pipe? 1/4 inch per foot
- Ensures proper drainage by gravity.
- What is the maximum allowable height for risers on stairs? 7 3/4 inches
- Building codes set this for safety and comfort.
- What is the function of an expansion joint in concrete slabs? To allow for thermal expansion and contraction
- What is the typical spacing for rafters in roof framing? 16 inches on center
- Supports roofing materials adequately.
- What does a sagging floor often indicate? Structural damage or joist failure
- Needs immediate evaluation.
- What is the maximum allowable gap for weatherstripping on exterior doors? 1/8 inch
- Prevents drafts and energy loss.
- What is the proper location for installing carbon monoxide detectors? Near sleeping areas and on each level
- Early detection prevents poisoning.
- What is the minimum height for a guardrail on stairs? 34 inches
- Consistent with stair safety codes.
- What is the maximum spacing for handrails on stairs? Not applicable; handrails run continuously
- Handrails should be continuous along the stairs.
- What type of vent is used to vent plumbing fixtures? Vent stack or air admittance valve
- Allows sewer gases to escape safely.
- What is the function of a trap primer? To keep water in the P-trap from evaporating
- Prevents sewer gases from entering the home.
- What is the purpose of flashing tape around windows? To seal joints and prevent water intrusion
- Improves weather resistance.
- What is the minimum thickness for a concrete footing? 8 inches
- Provides adequate load distribution.
- What is a common problem found in knob-and-tube wiring? No grounding conductor
- Increases shock and fire risk.
- What is the maximum allowable moisture content in wood framing? 19%
- Higher moisture leads to rot and mold.
- What tool is used to check the flatness of floors? Level
- What type of foundation drain is most effective? Perforated pipe surrounded by gravel
- Allows water to be collected and diverted away.
