Glossary of Home Inspection Terms
At Detect and Inspect Home Inspections, we aim to make home inspection reports clear and understandable. Therefore, we have compiled this comprehensive home inspection glossary of common home inspection terms. By exploring these definitions, you will gain confidence in understanding the technical language used during inspections.
Key Terms
AFCI (Arc Fault Circuit Interrupter) – First, an AFCI shuts off electricity when it detects an arc fault, which reduces the risk of fire.
Air Admittance Valve (AAV) – Additionally, an AAV allows air into the drain system without requiring a full vent pipe, which improves plumbing performance.
Anti-Scald Device – Similarly, this safety valve limits hot water temperature and prevents burns.
Asbestos – Although asbestos served as a heat-resistant mineral fiber in insulation, tiles, siding, and other materials, disturbing it can create hazards.
Attic Hatch – Moreover, the attic hatch provides access to the attic, so you should insulate and seal it to maintain energy efficiency.
Balloon Framing – Historically, balloon framing uses wall studs that run continuously from foundation to roof; consequently, builders commonly applied this method before 1930.
Baseboard Heat – Furthermore, baseboard heat radiates warmth along walls using either electric or hydronic systems, which provides consistent room heating.
Beam – Similarly, beams support loads across open spaces and maintain structural stability.
Breaker Panel – Likewise, the breaker panel contains circuit breakers or fuses that control and protect electrical circuits throughout the home.
BX Cable – On the other hand, BX cable provides armored protection for older electrical wiring with a metallic sheath.
Cast Iron Pipe – In addition, cast iron pipe creates a durable drain system; however, rust or cracks may develop over time.
Circuit Breaker – Meanwhile, circuit breakers shut off electrical flow during faults, which prevents overheating or fire hazards.
Collar Tie – Moreover, collar ties run horizontally in the upper third of a roof, helping resist outward thrust from rafters.
Concrete Block Foundation – Likewise, concrete block foundations provide sturdy support through stacked masonry units.
Copper Pipe – Similarly, copper pipe delivers a durable and reliable water supply line.
Crawl Space – In addition, crawl spaces provide access to mechanical systems, and you should insulate them and control moisture.
Cripple Wall – Conversely, cripple walls sit between the foundation and first-floor framing, making them vulnerable during earthquakes if unreinforced.
Drip Loop – Additionally, drip loops curve downward in overhead electrical wires before they enter the home, preventing water from entering the conduit.
Ductwork – Moreover, ductwork circulates conditioned air throughout a home using metal or flexible tubes.
Electrical Service Drop – Furthermore, electrical service drops bring power from the utility to your home, using either overhead or underground wires.
Fieldstone Foundation – Similarly, fieldstone foundations use irregular stones and mortar; consequently, water and shifting can create problems over time.
Flashing – In addition, flashing prevents water from entering joints at roofs, windows, and doors.
Forced Air – Likewise, forced air systems use ducts and a blower to circulate heated or cooled air throughout the home.
Furnace – Moreover, furnaces heat air and distribute it through ductwork efficiently.
GFCI (Ground Fault Circuit Interrupter) – Additionally, GFCI outlets detect differences in current and shut off power near water sources to prevent shocks.
Granite Foundation – Granite foundations offer durable support; however, you should maintain joints to avoid structural issues.
Gravity Heat – Conversely, gravity heat moves warm air naturally without using fans or pumps.
Header – Furthermore, headers sit over windows or doors and support structural loads.
Joist – Similarly, joists run horizontally and support floors or ceilings.
Knob and Tube Wiring – Historically, knob and tube wiring uses ceramic knobs and tubes; therefore, updating it reduces fire risk.
Lally Column – Moreover, lally columns contain concrete-filled steel that supports beams more reliably than adjustable screw jacks.
Main Disconnect – In addition, the main disconnect shuts off all power in the home, usually at the breaker panel.
Mini-Split System – Likewise, mini-splits provide ductless heating and cooling using both indoor and outdoor units.
PEX Pipe – Furthermore, PEX pipe provides flexible water supply lines that resist freezing and install easily.
Pilot Light – Similarly, pilot lights maintain a small gas flame that ignites burners in older appliances.
Plenum – In addition, the plenum distributes air in a forced-air system and usually sits above or below the furnace.
Pointing – Likewise, pointing restores mortar between masonry units in walls or foundations.
PVC Pipe – Moreover, PVC pipes carry drain, waste, and vent water efficiently.
Radiant Floor Heating – Similarly, radiant floor systems heat spaces evenly using hot water or electric coils installed under the floor.
Rafters – In addition, rafters support the roof structure and transfer loads to exterior walls.
Receptacle – Likewise, a receptacle refers to an electrical outlet.
Return Register – Similarly, return registers pull air back into a forced-air system.
Romex (NM Cable) – Additionally, Romex provides plastic-sheathed wiring for modern homes.
Seismic Strap – Moreover, seismic straps secure water heaters and appliances in earthquake-prone areas.
Service Panel – Likewise, service panels distribute electricity throughout the home and house breakers or fuses.
Sewer Ejector Pump – Similarly, sewer ejector pumps move wastewater from lower levels to the main sewer or septic system when gravity alone cannot do so.
Shut-Off Valve – In addition, shut-off valves stop water or gas flow to fixtures or appliances.
Slab Foundation – Likewise, slab foundations consist of poured concrete, usually without basements or crawl spaces.
Solid Aluminum Wiring – Similarly, solid aluminum wiring appears in some 1960s–70s homes; therefore, replacing it reduces fire risk.
Steam Radiator – Moreover, steam radiators heat spaces with steam in cast iron units commonly found in older homes.
Sump Pump – Additionally, sump pumps remove water from basements or crawl spaces and prevent flooding.
Thermal Seal Failure – Likewise, thermal seal failure occurs when window or door seals break, causing fogging or condensation.
TPRV (Temperature and Pressure Relief Valve) – Furthermore, TPRVs release water if temperature or pressure exceeds safe levels on a water heater.
Truss – Similarly, trusses form triangular roof framing units that distribute load across exterior walls.
Vapor Barrier – In addition, vapor barriers prevent moisture from entering walls, ceilings, or floors.
Vermiculite – Historically, vermiculite insulation may contain asbestos if installed before 1990; therefore, test it before disturbing.
Water Hammer – Moreover, water hammer produces loud banging when water flow stops suddenly in plumbing.
Water Heater – Similarly, water heaters supply hot water for household use, either in tanks or on-demand units.
Wattage Rating – Additionally, wattage ratings indicate the maximum electrical load a component or circuit can safely handle.
Weatherhead – Furthermore, weatherheads cap overhead electrical wires where they enter the home, preventing water intrusion.
Weep Holes – Lastly, weep holes let water escape from the bottom of windows or brick walls.
Why This Glossary Matters
Understanding these home inspection glossary terms will help you read your home inspection report with confidence. It empowers homeowners, buyers, and sellers to make informed decisions about repairs, improvements, and safety.