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WISCONSIN HOME INSPECTOR LICENSE EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2025
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16.What is the common cause of cracks in basement walls? Soil movement and water pressure
36.What is the function of an expansion tank in a hot water system? To absorb pressure changes from water heating
Overheating and electrical fires Double tapping can cause loose connections and overheating in the panel. 56.Which material is commonly used for modern residential supply pipes? PEX tubing PEX is flexible, resistant to scale, and easier to install than copper. 57.What is the concern with aluminum wiring in homes? Higher risk of electrical fires Aluminum expands/contracts more than copper and can loosen connections. 58.What is one function of a ridge vent? Allows warm, moist attic air to escape Proper attic ventilation prevents mold and structural damage. 59.What tool is best for detecting heat loss around windows? Infrared camera Thermal imaging identifies areas of poor insulation or air leakage. 60.What is the purpose of a pressure relief valve on a water heater? To release excess pressure It prevents explosions by venting if pressure or temperature becomes too high. 61.What is the minimum height for an overhead service drop above a driveway? 12 feet This clearance ensures safety from vehicles and people. 62.What causes ice dams on roofs?
Poor attic insulation and ventilation Ice dams form when heat escapes, melts snow, and refreezes at eaves. 63.What is the typical size of a standard residential electrical service? 200 amps Modern homes usually require 200-amp service to meet electrical demand. 64.What is the allowable gap between the bottom of a door and the threshold in a garage? Less than 1/2 inch Larger gaps can allow fumes or pests into the home. 65.When inspecting a deck, which component is most critical to structural integrity? Ledger board attachment Failure at the ledger board is a common cause of deck collapses. 66.What is the function of a thermal expansion valve in HVAC systems? To regulate refrigerant flow It ensures proper cooling efficiency and prevents system freeze-up. 67.What defect is indicated by bulging exterior brick walls? Structural movement or foundation failure Bulging may suggest compromised load-bearing capacity. 68.What is a common sign of a failing septic tank? Soggy soil or standing water over the drain field Indicates system overload or blockage.
240 - volt dedicated circuit High-demand appliances require 240V power on their own circuit. 77.What does a cracked heat exchanger in a furnace indicate? Carbon monoxide risk A cracked exchanger can leak combustion gases into the home. 78.What is a proper way to test GFCI outlets? Press the test and reset buttons This verifies the GFCI is functioning as intended. 79.Which part of a roof is most prone to leaking? Valleys and flashing areas Water concentrates in valleys; flashing is vulnerable to gaps. 80.What is “headroom” in stairways? Vertical clearance above stairs Minimum required is typically 6’8” to prevent head injury. 81.How is structural settlement typically identified? Cracks in walls or foundation Diagonal cracks or stair-step cracks indicate movement. 82.What is a safe slope for a wheelchair ramp? 1:12 (1 inch rise for every 12 inches run) This is ADA compliant for accessibility. 83.What component must be inspected on gas furnaces for safety?
Flue pipe Ensures safe venting of combustion gases. 84.What indicates possible water intrusion in a crawlspace? Efflorescence and mold growth Both result from moisture presence and poor ventilation. 85.What is a common cause of trip hazards in walkways? Uneven concrete slabs Can occur due to tree roots, settling, or frost heave. 86.What tool helps confirm electrical current is present? Non-contact voltage tester A safe way to detect live wires. 87.What is the role of a footing in construction? Distributes load to the soil Footings prevent settling and provide a stable base. 88.What is the significance of rust on electrical panel screws? Possible water intrusion Water inside panels is a serious safety concern. 89.What is a key sign of poor attic ventilation? Frost buildup on underside of roof sheathing Moisture from indoor air condenses and freezes due to poor airflow. 90.What is the maximum allowable riser height variation?
Corrosion and reduced water flow Corrosion builds up inside, restricting flow and causing leaks. 98.What is a “kick-out” flashing? Directs water away from cladding at roof-wall intersections Prevents water from entering behind siding. 99.What is a common defect in manufactured fireplaces? Improperly installed or missing flue liner Leads to poor drafting and fire hazards.