Glossary

Construction Dictionary and Glossary of Construction Terms

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Term	Definition
ICBO	International Conference of Building Officials, a nonprofit organization that publishes the Uniform Building Code.
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 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.
Incombustible	See Noncombustible.
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.
Interpolate	To estimate untested values that fall between tested values.
ISO	International Standards Organization, an organization similar in nature.