I-CODES®: The set of model building codes promulgated by the International Code Council (ICC). The I-Codes include the International Residential Code (IRC), the International Building Code (IBC), the International Energy Conservation Code (IECC), the International Mechanical Code, and others. (See also INTERNATIONAL CODE COUNCIL.)
IBC: See INTERNATIONAL BUILDING CODE.
ICAA: Insulation Contractors Association of America.
ICBO: International Conference of Building Officials. ICBO, once one of three model code agencies in the United States, developed the Uniform Building Code (UBC), which had been commonly adopted in the Western United States. ICBO has been absorbed into the ICC. (See also INTERNATIONAL CODE COUNCIL; UBC.)
ICC: See INTERNATIONAL CODE COUNCIL.
IECC: See INTERNATIONAL ENERGY CONSERVATION CODE.
IGNITION BARRIER: A building code permitted protective covering applied over foam plastic insulations, including SPF, in attics and crawlspaces to increase the time it takes for the foam plastic to become involved in a fire. Ignition barriers do not provide as much fire protection as thermal barriers. The building code restricts the use of ignition barriers to attics and crawlspaces of limited access (check the local building code for specific requirements).
IGNITION TEMPERATURE: See FLASH-IGNITION TEMPERATURE.
IMPACT RESISTANCE: Ability to withstand mechanical or physical blows without the loss of protective properties. The impact resistance of the roofing assembly is a function of all its components and not only the membrane.
IMPINGEMENT MIXING: A process of mixing in which multiple liquid streams are forced toward one another at a high velocity, producing very thorough mixing in a short period of time.
INFRA-RED THERMOGRAPHY: Photography in the infra-red wave length wherein the temperature differences of objects and surfaces can be readily distinguished. Infra-red thermography is frequently used to (1) identify sources of heat loss or gain that affect building energy efficiency; (2) identify sections of building assemblies containing moisture; and (3) identify electrical or mechanical components that are overheating.
INTERLAMINAR ADHESION: Adhesion between polyurethane foam passes or coating passes. (See also COHESION.)
INTERNATIONAL BUILDING CODE (IBC): Revised every three years, one of the I-CODES® promulgated by the International Code Council (ICC) oriented toward general construction other than one- and two-family dwellings, which are covered under the International Residential Code (IRC). (See also INTENATIONAL CODE COUNCIL; I-CODES; INTERNATIONAL RESIDENCE CODE.)
INTERNATIONAL CODE COUNCIL (ICC): The ICC formed in 1994 from the merger of BOCA, ICBO, and SBCCI to promulgate a common set of model building codes. Codes developed by the ICC are commonly referred to at the I-CODES®. (See also BOCA; ICBO; I-CODES; SBCCI.)
INTERNATIONAL ENERGY CONSERVATION CODE (IECC): A model building code promulgated by the ICC designed to set minimum standards of energy conservation for buildings. The IECC is one of the I-CODES® and is revised every three years. (See INTERNATIONAL CODE COUCIL, I-CODES.)
INTERNATIONAL RESIDENTIAL CODE (IRC): A model building code promulgated by the ICC designed to set minimum standards of residential construction (one- and two-family dwellings). The IRC is one of the I-CODES® and is revised every three years. (See also INTERNATIONAL CODE COUNCIL; I-CODES.)
INTUMESCENT COATING: Coatings that are formulated to swell and char when exposed to heat. When applied to a combustible (or non-combustible) substrate, this “swollen char” is designed to insulate the substrate from the heat source, thus reducing the potential for fire and/or increasing the time before the substrate becomes involved in a fire.
IRC: See INTERNATIONAL RESIDENTIAL CODE.
ISO: Vernacular for ISOCYANATE. (See also ISOCYANATE.)
ISOCYANATE: A highly reactive organic chemical containing one or more isocyanate (-N=C=O) groups. A basic component in polyurethane foam chemical systems and some polyurethane coating systems.ISOCYANURATE: Also referred to as PIR, polyiso, or polyisocyanurate, it is essentially a modified polyurethane (PUR) foam. The proportion of methylene diphenyl diisocyanate (MDI) is higher than for PUR and instead of a polyether polyol resin, a polyester derived polyol is used in the reaction. Catalysts, blowing agents, and additives used in PIR foam formulations also differ from those used in PUR. Isocyanurates are generally manufactured in a factory into boardstock form, and are used in exterior roofing and sheathing applications. The thermal performance of isocyanurate or PIR boardstock foams is comparable to MEDIUM-DENSITY CLOSED CELL SPF. (See also MEDIUM-DENSITY SPF; CLOSED CELL SPF).
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