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I-Beam
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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.
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I-Joist
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A joist whose cross-section is shaped like an “I”. Used as floor joists and rafters.
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Impel Rod
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A plug inserted in the end of any log that comes in contact with excessive moisture. The plug slows the deterioration of the log.
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Incompatibility
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Descriptive of two or more materials which are not suitable to be used together.
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Infiltration
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The process by which air leaks into a building. In either case, heat loss results. To find the infiltration heating load factor (HLF), the formula to account for the extra BTU's needed to heat the infiltrated air is:
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Inside Drain
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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.
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Insulation Board
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A rigid 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, in various densities, and with several treatments.
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Insulation Suppresser
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Four foot long pieces of solid wavy foam that are placed within rafter cavities to prevent insulation from touching the underside of the sheathing to keep a cold roof and aid in the prevention of ice damming.
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Insulation
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(1) 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). (2) 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.
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Insulation Fasteners
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Any of several specialized mechanical fasteners designed to hold insulation down to a steel or a nailable deck.
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Integral Porch
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A porch which is “integrated” into the main roof system. Typically has a flat ceiling.
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Interior Dormer
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A dormer used on the inside of the house to create adequate headroom.
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Interior Log
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Log Siding applied to the inside of the home.
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Interior Finish
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Material used to cover the interior framed areas, or materials of walls and ceilings
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Interply
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Between two layers of roofing felts that have been laminated together.
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IRMA
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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.
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