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Interceptor

A trapping device designed to collect materials that will not be able to be handled by a sewage treatment plant, such as grease, glass or metal chips, and hair.

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Interest

- The cost paid to a lender for borrowed money.

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Intentionally Used Substance

Any chemical substance that is used in the production of the homogeneous material/mixture, whether or not it is intended to remain in the manufacturer’s finished product. This includes all substances used in production, whether used by the product manufacturer or by an upstream supplier. https://healthymaterialslab.org/tool-guides/hml-resources

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Interior finish

Material used to cover the interior framed areas of walls and ceilings

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Insulation board, rigid

A structural building board made of coarse wood or cane fiber in ½- and 25/32-inch thickness. It can be obtained in various size sheets and densities.

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Insulation

Any material high in resistance to heat transmission that, when placed in the walls, ceiling, or floors of a structure, and will reduce the rate of heat flow.

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Insulating glass

Window or door in which two panes of glass are used with a sealed air space between. Also known as Double glass.

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Insulation, Electric

A material that is a poor conductor of electricty.

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Insulatig Glass

A glazing unit used to reduce the transfer of heat through a glazed opening by leaving an air space between layers of glass.

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Insulation (Thermal)

Any material that measurably retards heat transfer. There is wide variation in the insulating value of different materials. A material having a low density (weight/volume) will usually be a good thermal insulator.

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Interpolate

To estimate untested values that fall between tested values.

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Jack rafter

A rafter that spans the distance from the wall plate to a hip, or from a valley to a ridge.

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Irrigation

- Lawn sprinkler system.

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Jack post

A type of structural support made of metal, which can be raised or lowered through a series of pins and a screw to meet the height required. Basically used as a replacement for an old supporting member in a building. See Mono-post.

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J Channel

Metal edging used on drywall to give the edge a better finished appearance when a wall is not "wrapped" Generally, basement stairway walls have drywall only on the stair side. J Channel is used on the vertical edge of the last drywall sheet

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Iron

A metallic element existing in the crust of the earth from which ferrous alloys, such as cast iron, are made.

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Invert Elevation

The elevation of the bottom (flow line) of a pipe.

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ISO

International Standards Organization, an organization similar in nature.

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Isocyanates

A class of highly reactive chemicals used in the manufacture of flexible and rigid foams, fibers, coatings, and elastomers. https://healthymaterialslab.org/tool-guides/hml-resources

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Intumescence

The swelling of a fire-retardant coating when heated, which forms a low-density film that provides some resistance to the spread of flame on the surface.