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
Construction industry of the United Kingdom Construction industry of the United Kingdom The construction industry of the United Kingdom contributed gross value of £64,747 million to the UK economy in 2004. The industry employed around 2.2 million people in the fourth quarter of 2009. There were around 194,000 construction firms in Great Britain in 2009, of which around 75,400 employed just one person and 62 employed over 1,200 people. In 2009 the construction industry in Great Britain received total orders of around £18.7 billion from the private sector and £15.1 billion from the public sector. While manufacturing in the United Kingdom shrank as a proportion of