Thermal conductivity common use in the construction and textile industries. The construction industry makes use of units such as the R-value (resistance) and the U-value (transmittance). Although related to the thermal conductivity of a material used in an insulation product, R- and U-values are dependent on the thickness of the product. Likewise the textile industry has several units including the tog and the clo which express thermal resistance of a material in a way analogous to the R-values used in the construction industry. There are a number of ways to measure thermal conductivity. Each of these is suitable for a limited range
National Office of Building Technology and Administration National Office of Building Technology and Administration The National Office of Building Technology and Administration* () was a Norwegian government agency responsible for managing laws and rules related to building and construction, authorises rules related to documentation of construction materials and their properties, as well as approving companies related to the "Plan- and Building Act". The agency gives however jurisdiction to local municipalities, along with the County Governor, in appealing individual building permits. Since 1 January 2012, the office has taken on the title of Directorate of Building Quality (Norwegian: "Direktoratet for Byggkvalitet)." The Directorate of Building Quality is organized