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OREGON HOME INSPECTOR LICENSE
EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2025
- What is the primary purpose of a home inspection? To identify visible defects and safety issues in the home The inspector's role is to evaluate the condition of accessible components, not to guarantee the home's overall condition.
- When inspecting a roof, what is the most common material used for residential roofing in Oregon? Asphalt shingles Asphalt shingles are the most widely used roofing material due to cost- effectiveness and durability.
- Which of the following is NOT typically included in a standard home inspection report? a) Structural components b) Plumbing systems
c) Cosmetic issues like paint color d) Electrical systems Cosmetic issues like paint color Home inspections focus on function and safety, not aesthetics.
- What is the minimum slope required for a roof to ensure proper drainage? 2:12 (2 inches of rise per 12 inches of run) A slope less than 2:12 may lead to water pooling and potential leaks.
- During inspection, what is the acceptable moisture level range in wood framing to avoid decay? Below 19% Wood moisture above 19% creates conditions conducive to mold and wood rot.
- Which type of electrical wiring is considered outdated and potentially hazardous? Knob and tube wiring Knob and tube wiring lacks grounding and can be unsafe by modern standards.
- What is the typical height for a residential handrail on stairs? 34 to 38 inches Building codes require handrails within this range to ensure safety.
- Which device is required on all circuits in kitchens, bathrooms, and outdoor receptacles? Ground-fault circuit interrupter (GFCI) GFCIs protect against electrical shock in wet areas.
16.What is the primary function of the main electrical panel? To distribute electricity safely throughout the home The panel contains breakers that protect circuits from overloads. 17.What is a common sign of foundation movement? Cracks in walls, uneven floors, or doors that stick These signs indicate potential structural problems. 18.Which of the following is NOT a component of a home's HVAC system? a) Furnace b) Evaporator coil c) Water heater d) Air conditioner Water heater Water heaters are plumbing fixtures, not part of HVAC. 19.What does R-value measure? Thermal resistance of insulation Higher R-value means better insulating properties. 20.What is the standard spacing for residential floor joists? 16 inches on center This spacing balances structural strength with material economy. 21.Which of the following should NOT be used to patch a leaking roof? a) Roofing cement b) Metal flashing c) Regular household tape d) Roof patching membrane
Regular household tape Tape is not durable or waterproof enough for roof repairs. 22.What is a visible sign of water damage on a ceiling? Staining or discoloration Water stains are common indicators of leaks. 23.What is the purpose of a vapor barrier in a crawlspace? To prevent moisture from the ground entering the home Moisture control reduces mold and wood rot. 24.What is the typical lifespan of asphalt shingles? 20 to 30 years Environmental factors can shorten or lengthen this lifespan. 25.What is the minimum clearance required between a gas appliance and combustible materials? 6 inches Maintaining clearance prevents fire hazards. 26.What does the term "load-bearing wall" mean? A wall that supports weight from above Removing or altering such walls requires structural consideration. 27.What tool helps detect hidden moisture in walls or floors? Moisture meter This device measures moisture levels that are not visible to the eye.
34.Which component prevents backflow in plumbing systems? Backflow preventer It stops contaminated water from entering the clean water supply. 35.What is a common problem caused by clogged gutters? Water damage to fascia and foundation Overflowing gutters cause water to run down walls or pool around the foundation. 36.Which of the following is a typical cause of drywall cracks? Building settling As a house settles, minor cracks can appear in drywall. 37.What is a common indicator of termite damage? Hollow sounding wood or small holes in wood Termites eat wood from inside, causing weakening. 38.What is the function of a pressure relief valve on a water heater? To release excess pressure and prevent tank explosion This is a critical safety feature. 39.What is the primary concern with improperly vented combustion appliances? Carbon monoxide poisoning Incomplete combustion gases can be deadly without proper venting. 40.What type of foundation is most common in Oregon? Concrete slab or crawlspace Many Oregon homes are built on slabs or have crawlspaces due to soil and climate.
41.What is the acceptable spacing between balusters on a residential guardrail? No more than 4 inches apart This spacing prevents small children from slipping through. 42.What is the minimum depth for footings in Oregon residential construction? 12 inches below frost line This depth prevents frost heave damage. 43.When inspecting a septic system, what is a red flag? Slow draining toilets or sinks Slow drainage may indicate system failure or blockage. 44.What is a common defect in older aluminum wiring? High risk of overheating and fire Aluminum wiring can oxidize and loosen, causing hazards. 45.How should an inspector evaluate insulation in an attic? Measure thickness and type to estimate R-value Proper insulation levels affect energy efficiency. 46.What is the function of weep holes in brick veneer walls? Allow water to drain out from behind the veneer Weep holes prevent moisture buildup that could damage the wall. 47.What is the minimum clearance between a water heater and combustibles? 6 inches This clearance is necessary for safety and code compliance.
54.What is the main concern when inspecting older polybutylene plumbing? Prone to leaks and failure Polybutylene pipes are known to degrade and rupture over time. 55.What is a common defect found in decks? Rotting wood at ledger board connection If not properly flashed, water infiltrates and causes decay at this critical attachment point. 56.What is the typical voltage of a residential electrical system in Oregon? 120/240 volts This is standard split-phase power for most homes. 57.How often should chimneys be cleaned to prevent creosote buildup? At least once per year Regular cleaning reduces fire hazards. 58.What is a typical sign of inadequate attic insulation? Ice dams on the roof in winter Heat loss through the attic melts snow unevenly, refreezing at eaves. 59.What type of foundation wall crack is usually non-structural? Hairline vertical cracks Small vertical cracks often result from drying shrinkage and are not serious. 60.What does a thermal imaging camera detect during a home inspection? Temperature variations indicating moisture or insulation issues Thermal anomalies can reveal hidden leaks or air infiltration.
61.What is the minimum required water pressure in a residential home? 40 psi Lower pressures may affect appliance function and water delivery. 62.What is the purpose of a drip edge on a roof? To direct water away from fascia and protect roof deck edges It helps prevent water damage to underlying materials. 63.What is the main hazard associated with aluminum wiring? Potential for overheating and fire Aluminum wiring can oxidize and loosen connections. 64.What is the standard height for kitchen countertops? 36 inches This height is ergonomically designed for most users. 65.What does a GFCI receptacle protect against? Electrical shock from ground faults It quickly cuts off power to prevent injury. 66.What is the function of a ridge vent on a roof? To allow hot air to escape from the attic Proper attic ventilation reduces moisture and heat buildup. 67.What is a common defect found in vinyl siding installation? Improper fastening causing warping Siding must be installed loosely enough to allow expansion.
75.What is the primary cause of corrosion in copper plumbing? Acidic or soft water Water chemistry can accelerate corrosion. 76.What is the typical purpose of a septic system drain field? To disperse treated wastewater into soil Allows natural filtration and absorption. 77.Which type of foundation crack indicates a potential structural problem? Horizontal cracks wider than 1/4 inch May indicate soil pressure or foundation movement. 78.What is the function of a sump pit? To collect groundwater before being pumped out Keeps basement dry. 79.What is a common sign of roof leak? Water stains or mold on ceiling drywall Indicates moisture intrusion. 80.What does “dead load” in building construction mean? The permanent weight of structural components Includes walls, floors, and fixed equipment. 81.What is a common cause of cracked plaster walls? Building settling or vibrations Often minor and cosmetic.
82.What is the purpose of a backwater valve in plumbing? To prevent sewage backup into the home Protects against flooding during municipal system backups. 83.What is the minimum number of outlets required in a kitchen countertop wall space? One outlet every 4 feet Prevents excessive use of extension cords. 84.What is the main function of attic baffles? To keep insulation from blocking soffit vents Ensures proper ventilation. 85.What is a common problem with old cast iron drain pipes? Corrosion and cracking Leads to leaks and blockages. 86.What is the recommended minimum thickness of concrete slab in a garage? 4 inches Provides adequate strength for vehicle loads. 87.What is the purpose of a water hammer arrestor? To absorb shock from sudden water flow stops Prevents pipe noise and damage. 88.Which of the following is a common cause of ice dams on roofs? Inadequate attic insulation and ventilation Heat escapes and melts snow unevenly.
96.What is the function of an expansion tank in a water heating system? To absorb pressure changes from thermal expansion Prevents system damage. 97.What is the best way to check for gas leaks during inspection? Use a gas detector or soapy water Detects leaks safely. 98.What is the maximum spacing allowed for deck ledger fasteners? 16 inches on center Ensures strong attachment to the structure. 99.What type of insulation is typically not recommended for attics due to fire risk? Foam insulation without proper fire barrier Foam needs to be covered by drywall or other protection.
- What is the purpose of a drip loop in exterior electrical wiring? To prevent water from running down the wire into the outlet box Protects electrical components from moisture.
- What is a common problem with older concrete driveways? Cracking from freeze-thaw cycles Water expands in cracks causing further damage.
- What is the correct way to measure ceiling height? From finished floor to finished ceiling Accurate measurement is necessary for code compliance.
- What type of test is commonly used to check sewer line integrity? Video camera inspection Allows visual inspection of pipes.
- What does a flashing failure around a skylight typically cause? Leaks and water damage Flashing must properly divert water.
- What is the standard voltage for residential lighting circuits? 120 volts This is the typical voltage for household lighting.
- Which of the following materials requires grounding in electrical systems? Metal water pipes Grounding reduces shock risk.
- What is the typical distance between joists in a floor system? 16 inches on center Standard spacing for strength and support.
- What is a common cause of mold in crawlspaces? Excess moisture and poor ventilation Promotes fungal growth.
- What is the function of weep holes in brick walls? To allow moisture to escape from behind the brick veneer Prevents moisture buildup and damage.
- What type of inspection tool can detect hidden electrical faults? Circuit tester or multimeter Identifies wiring problems safely.
- What is a recommended method to check for moisture in wood? Use a moisture meter Non-destructive and accurate measurement.
- What is the common cause of efflorescence on masonry walls? Water infiltration dissolving salts Evaporation deposits salts on surface.
- What is the correct way to test smoke detectors? Press the test button Activates alarm to verify function.
- What is the typical spacing for rafters in residential construction? 16 inches on center Standard spacing for structural support.
- What does a bonding jumper do? Ensures electrical grounding continuity Provides safe path for electrical faults.
- What is a common cause of ice dams on roofs? Inadequate attic insulation and ventilation Heat melts snow which refreezes at roof edges.
- What is the maximum spacing allowed for deck balusters? 4 inches Prevents small children from slipping through.
- What is the function of a backflow preventer? Stops contaminated water from entering potable water Protects water supply.
- What is a common defect in vinyl siding installation? Improper fastening causing warping Must allow for expansion.
- What is the minimum depth for frost footings in Oregon? 12 inches below frost line Prevents frost heave.
- What is the purpose of a pressure relief valve on a water heater? To prevent excessive pressure buildup Safety feature to avoid tank rupture.
- What type of wiring is considered outdated and hazardous? Knob and tube wiring Lacks grounding and is a fire risk.
- What is the typical lifespan of asphalt roofing shingles? 20 - 30 years Varies with maintenance and climate.
