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I-Beam - A steel beam often used for floor support. Cross section of beam resembles a capital I.

Infiltration - The act of wind blowing into the house through poorly weather-stripped windows and doors.

Inside Stop - See blind stop.

Insulation - A material designed to control the passing of heat and / or sound.

Interior Elevation - An orthographic view of an inside wall.

Ionic - The type of Greek column characterized by scroll-like decorations.