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.

insulating board: Any board suitable for insulating purposes: usually manufactured board made from vegetable fibers, such as fiberboard.

insulation: Materials for obstructing the passage of sound, heat, or cold from one surface to another.

interior trim: General term for al the finish molding, casing, baseboard, and cornice applied within the building by finish carpenters.

 

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