Architectural and Engineering Glossary

I
I-bar

Steel or iron bar whose cross section is similar to an I.

I-beam

A rolled or extruded structural metal beam having a cross section resembling the letter I.

I-house

A side gabled house, usually one and a half or two stories high, one room deep, and two rooms wide; the two rooms usually have an entrance hall between them containing a central stairway.

I-joist

A structural steel member having a cross section that resembles the capital letter I.

IALD

Abbr. for “International Association of Lighting Designers.”

IB

Abbr. for I-beam.

ICC

See International Code Council.

ICE

Abbr. for the “Institution of Civil Engineers,” London.

Ice Dam

 A buildup of snow and ice at the eaves of a sloping roof.

ICEA

Abbr. for “Insulated Cable Engineers Association.”

Icehouse

A building for storing ice that is usually cut during the winter from frozen lakes, rivers, or ponds for use later in the year; often located in a shady area; usually has overhanging eaves and thick exterior walls that are packed with thermal insulation and painted white to reduce the absorption of heat radiated from the sun.

Ichnography

The tracing of ground plans; the representation of a ground plot.

ICI

 Abbr. for “International Commission on Illumination.”

Iconostasis

A screen in a Greek Orthodox church, on which icons are placed, separating the chancel from the space open to the laity.

ID

On drawings, abbr. for “inside diameter.”

IDSA

Abbr. for “Industrial Designers Society of America.”

IEE

Abbr. for “Institution of Electrical Engi- neers,” London.

IEEE

Abbr. for “Institute of Electrical and Elec- tronics Engineers.”

IERI

Abbr. for “Illuminating    Engineering Research Institute.”

IES

1.Abbr. for the “Illuminating Engineering Society of  North America.” 2.Abbr. for (British) “Illuminating Engineering Society.”

IF

Abbr. for “inside face.”

Igloo, Iglu

A hemispherical shell, built by Eskimos of blocks of ice or packed snow as a temporary dwelling for a single family; usually about 10 to 15 feet (3 to 4.5 m) in diameter at its base, with the floor often partially below the surrounding terrain. Daylight within was provided by one or more blocks of relatively transparent freshwater ice, or by an opening covered with a piece of translucent seal intestine. Entry was usually along a domed passageway. A hemispherical shell, built by Eskimos of blocks of ice or packed snow as a temporary dwelling for a single family; usually about 10 to 15 feet (3 to 4.5 m) in diameter at its base, with the floor often partially below the surrounding terrain. Daylight within was provided by one or more blocks of relatively transparent freshwater ice, or by an opening covered with a piece of translucent seal intestine. Entry was usually along a domed passageway.

Igneous Rock

 A class of rock formed by change of the molten material to the solid state; generally termed granite if coarse grained.

Ignitability

The ease with which ignition of a material can be initiated.

Ignition

The initiation of combustion, as evidenced by flame, glow, or explosion.

Ignition Source

A heat source having sufficient energy to initiate combustion of a material. ignition temperature of a material, the minimum temperature required to initiate combustion.
 
 

IHVE

Abbr. for “Institution of Heating and Ventilating Engineers.”

IIC

Abbr. for impact isolation class.

ILI

Abbr. for “Indiana Limestone Institute.”

Illite

A clay mineral,a hydrous silicate of potassium,aluminum,iron,and magnesium;swells considerably on wetting and shrinks proportionately on drying.

Illuminance

The density of luminous power,also called “illumination.” One lumen of luminous flux,uniformly incident on 1 square foot of area, produces an illuminance of 1 footcandle; in SI units, one lumen of luminous flux,uniformly incident on 1 square meter of area, produces an illuminance of 1 lux.

Illuminated Sign

A sign designed or arranged to emit or reflect light from an attached artificial source.

Illumination

The luminous flux density incident on a surface, i.e.the luminous flux per unit area; usually expressed in lumens per square foot or footcandles,and lumens per square meter or lux.

Illumination Level

The quantity of light that illuminates a surface;measured in foot candles or in lux.

Illumination Meter,Brit.illumination Photometer

An instrument for measuring the illumination on a surface;usually consists of barrier layer cells connected to a meter calibrated directly in a set of illumination units.

ILLUS

On drawings, abbr. for “illustrate.”

Ilmenite

A mineral which is commonly used as an aggregate in high density concrete;also called iron titanate.

Image

Any representation of form or features,but esp.one of the entire figure of a person;a statue,effigy,bust, relief, intaglio, etc.

Imaret

A type of hostelry for the accommodation of Muslim pilgrims and other travelers in the Turkish empire.

Imbow

Same as embow.

Imbrex

1.A tile, semicircular in shape,which fits over the joints in a tile roof.2.One of the scales in ornamental imbrication.

Imbricate

To overlap in regular order,as shingling,tiles, etc.

Imbrication

Overlapping rows of shaped tiles or shingles that resemble overlapping fish scales;also see contreimbrication.

IMC

Abbr. for intermediate metallic conduit.

IMechE

Abbr. for “Institution of Mechanical Engineers.”

Immersion Heater

A heater in which the electric heating element,submerged in a water tank,is controlled by a thermostat built into the tank or in contact with the water.

Immersion Vibrator

A vibrator which is inserted in the fresh concrete during the agitation,1 process.

Impact Insulation, Impact Isolation

1.The use of structures and materials designed to reduce the transmission of impact noise in a building.2.The degree by which transmission of impact noise is reduced by use of materials and structures for that purpose.

Impact Factor

In structural design,that factor by which a static load effect must be multiplied in order to find the increment of the dynamic effect of applying the load other than statically.

Impact Insulation Class (IIC)

A single number rating used to compare and evaluate the performance of floor ceiling constructions in isolating impact noises.