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to a letter:
I
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.
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.
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.
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.
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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