Term | Definition |
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I Joist | A wood joist made of an assembly of laminated veneer wood top and bottom flanges and a web of plywood or oriented strandboard. |
ICBO | International Conference of Building Officials, a nonprofit organization that publishes the Uniform Building Code. |
Igneous Rock | Rock formed by the solidification of molten material to a solid state. |
Illuminance | The density of luminous power in lumens per a specified area. |
Impact Insulation Class | An index of the extent to which a floor assembly transmits impact noise from a room above to the room below. |
Impact Insulation Class (IIC) | Single-number rating used to compare and evaluate the performance of floor-ceiling constructions in isolating impact noise. The advantages of this rating system are positive values and the correlation with Sound Transmission Class (STC) values -- both providing approximately equal isolation at a particular value. The IIC rating is used by building agencies for specifying minimum sound-control performance of assemblies in residential construction. |
Impact Noise | Sound generated by impact on the floor or other parts of a building that is carried through the building. |
Impact Noise Rating (INR) | Obsolete rating system for floor-ceiling construction in isolating impact noise. INR ratings can be converted to approximate IIC ratings by adding 51 points; however, a variation of 1 or 2 points may occur. |
Impact Strength | The energy required to fracture a specimen when struck with a rapidly applied load. |
Impact Test | A test for determining the resistance of a specimen fracture from a high-velocity blow. |
In Situ | Undisturbed soil. |
Incandescence | The emission of visible light produced by heating. |
Incombustible | See Noncombustible. |
Independent Footings | Footings supporting a single structural element, such as a column. |
Infiltration | The process by which water soaks into the ground. Also called Percolation. |
Ingot | A mass of molten metal cast in a mold and solidified to be stored until used for forging or rolling into a finished product. |
Insolation | The amount of solar radiation on a given plane or surface. |
Insulatig Glass | A glazing unit used to reduce the transfer of heat through a glazed opening by leaving an air space between layers of glass. |
Insulation (Thermal) | Any material that measurably retards heat transfer. There is wide variation in the insulating value of different materials. A material having a low density (weight/volume) will usually be a good thermal insulator. |
Insulation, Electric | A material that is a poor conductor of electricty. |
Interceptor | A trapping device designed to collect materials that will not be able to be handled by a sewage treatment plant, such as grease, glass or metal chips, and hair. |
Interpolate | To estimate untested values that fall between tested values. |
Intumescence | The swelling of a fire-retardant coating when heated, which forms a low-density film that provides some resistance to the spread of flame on the surface. |
Invert Elevation | The elevation of the bottom (flow line) of a pipe. |
Iron | A metallic element existing in the crust of the earth from which ferrous alloys, such as cast iron, are made. |
ISO | International Standards Organization, an organization similar in nature. |