I-Beam: A steel beam with a cross section resembling the letter "I." It is used for long spans as basement beams or over wide wall openings, such as a double garage door, when wall and roof loads are imposed on the opening.
I-Joist: Manufactured structural building component resembling the letter "I." Used as floor joists and rafters. I-joists include two key parts: flanges and webs. The flange of the I joist may be made of laminated veneer lumber or dimensional lumber, usually formed into a 1 ½" width. The web or center of the I-joist is commonly made of plywood or oriented strand board (OSB). Large holes can be cut in the web to accommodate duct work and plumbing waste lines. I-joists are available in lengths up to 60 feet long.
ID (Inside Diameter): The diameter measurement taken from the inside of a pipe. A common method for sizing pipe.
IIC: A new system utilized in the Federal Housing Administration recommended criteria for impact sound insulation.
Immediate Cost: Estimated cost of remedying an existing safety hazard or repairing a system or component that will likely fail within a year.
Imminent Danger: A condition which could cause serious or life-threatening injury or death.
Incandescent Lamp: A lamp employing an electrically charged metal filament that glows at white heat. A typical light bulb.
Incompatibility: Descriptive of two or more materials which are not suitable to be used together.
Indemnification Clause: Provision in a contract in which one party agrees to be financially responsible for specified types of damages, claims, or losses.
Index: The interest rate or adjustment standard that determines the changes in monthly payments for an adjustable rate loan.
Infestation: The presence of insects, rats, vermin, or other pests.
Infill: Area of the railing system bounded by the railing posts, cap, rail, and the deck.
Infiltration: The process by which air leaks into a building. To find the infiltration heating load factor (HLF), the formula to account for the extra BTUs needed to heat the infiltrated air is BTU/HR = building volume x air changes x BTU/cu.ft/hr x TD (temperature difference).
Inlet: An opening providing a means of entrance or intake.
INR (Impact Noise Rating): A single figure rating which provides an estimate of the impact sound insulating performance of a floor-ceiling assembly.
Inside Corner: The point at which two walls form an internal angle, as in the corner of a room.
Inside Drain: In roofing, a drain positioned on a roof at some location other than the perimeter. It drains surface water inside the building through closed pipes to a drainage system.
Inspected Property: The readily accessible areas of the buildings, site, items, components, and systems included in the inspection.
Inspection: The process of an inspector collecting information through visual observation during a walk-through survey of the subject property, conducting research about the property, and then generating a meaningful report about the condition of the property based on the observations made and research conducted by the inspector.
Inspector: One who performs the residential or commercial property inspection.
Installed: Attached or connected such that the installed item requires tool for removal.
Insulating Glass: Window or door in which two panes of glass are used with a sealed air space between. Also known as Double Glass.
Insulating Glass Unit: Two or more lights of glass spaced apart and hermetically sealed to form a single-glazed unit with an air space between each light. Commonly called IG units.
Insulation: Generally, any material which slows down or retards the flow or transfer of heat. Building insulation types are classified according to form as loose-fill, flexible, rigid, reflective, and foamed-in-place. All types are rated according to their ability to resist heat flow (R-Value). In electrical contracting, rubber, thermoplastic, or asbestos wire covering. The thickness of insulation varies with wire size and type of material, application or other code limitations.
Insulation Board: A rigid structural building board made of coarse wood or cane fiber in 1/2 and 25/32 inch thickness. It can be obtained in various size sheets, in various densities, and with several treatments.
Insulation Fasteners: Any of several specialized mechanical fasteners designed to hold insulation down to a steel or a nailable deck.
Interest: The cost paid to a lender for borrowed money.
Interior Finish: Material used to cover the interior framed areas, or materials of walls and ceilings.
Interior Glazed: Glazing infills set from the interior of the building.
Interlayer: In glazing, any material used to bond two lights of glass and/or plastic together to form a laminate.
Interlocking Shingles: Individual shingles that mechanically fasten to each other to provide wind resistance.
Interply: Between two layers of roofing felts that have been laminated together.
Interview: To discuss with those who have knowledge about the subject property.
Intrusive: Destructive.
IPS (Iron Pipe Size): Pipe thread sizing system. Also measurement of the outside diameter of a pipe.
IRMA [Insulated (or Inverted) Roof Membrane Assembly]: In this system the roof membrane is laid directly on the roof deck, covered with extruded foam insulation and ballasted with stone, minimum of 1000 lbs. per square.
Irrigation: Lawn sprinkler system.
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