Glossary of Terms - National Home Inspection Service

National Home Inspection Service


Glossary of Terms

Air Return
The return air is the air that returns to the HVAC system from the area that is being cooled or heated. This air flows through return grilles and through the HVAC’s ductwork for filtering and recycling or removal from the building
Crawl Bots/Crawlers
Crawlers allow inspectors to identify potential hazards and defects that may have otherwise gone unnoticed in hard to reach locations, thereby reducing inspector liability.
Crawlspace Inspection
A crawl space inspection is exactly what it sounds like—an inspection that looks for any issues in your home’s crawl space.
Reinforced plastic material composed of glass fibers embedded in a resin matrix.a textile fabric made from woven glass filaments
Home Inspector
A home inspection is a limited, non-invasive examination of the condition of a home, often in connection with the sale of that home. Home inspections are usually conducted by a home inspector who has the training and certifications to perform such inspections
Infrared (IR)
Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than those of visible light and shorter than radio waves. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from around 1 millimeter (300 GHz) to the nominal red edge of the visible spectrum, around 700 nanometers (430 THz).[1]
Mineral Wool
Mineral wool is a non-metallic, inorganic product manufactured from a carefully controlled mix of raw materials, mainly comprising either stone or silica which are heated to a high temperature until molten
Plastic Fiber Insulation
Plastic fiber insulation is an insulation material made primarily from recycled plastic milk bottles (polyethylene terephthalate or PET). The fibers are then formed into batt insulation similar to high-density fiberglass. The insulation is treated with a fire retardant so it doesn’t readily burn; however, it does melt when exposed to flame
Polyisocyanurate (/ˌpɒlɪˌaɪsoʊsaɪˈænjʊəreɪt/), also referred to as PIR, polyiso, or ISO, is a thermoset plastic[1] typically produced as a foam and used as rigid thermal insulation
A synthetic resin which is a polymer of styrene, used chiefly as lightweight rigid foams and films.
often abbreviated PUR and PU) refers to a class of polymers composed of organic units joined by carbamate (urethane) links. In contrast to other common polymers such as polyethylene and polystyrene, polyurethane is produced from a wide range of starting materials. This chemical variety produces polyurethanes with different chemical structures leading to many different applications.
Roof Thermal Imaging
Home Inspectors and Roofing professionals scan the roof, taking images to compile into a composite map, or they take an aerial image of the whole roof. These thermal images narrow the search for water intrusion, without damaging or puncturing the roof, saving time and pinpointing areas for repair.
Sump Pump
A sump pump is a device that moves water from your basement to the outside of your home. A sump is a naturally constructed pit, usually a hole carved below the main surface of your basement floor. This pit, known as a basin, holds the sump pump.
NHIS Staff

NHIS Staff

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