R-value (insulation) as ASHRAE 90.1 and the IECC prescribe U-values. However, R-value is widely used in practice to describe the thermal resistance of insulation products, layers, and most other parts of the building enclosure (walls, floors, roofs). Other areas of the world more commonly use U-value/U-factor for elements of the entire building enclosure including windows, doors, walls, roof, and ground slabs. The SI (metric) unit of R-value is whereas the I-P (inch-pound) unit is For R-values there is no difference between US customary units and imperial units, so the same I-P unit is used in both. Some sources use ″RSI″ when referring
Construction industry of the United Kingdom £15 billion projected cost. Prospective major construction projects include either expansion of London Heathrow Airport or expansion of Gatwick Airport, construction of the High Speed 2 rail line between London and the West Midlands, and construction of the Crossrail 2 rail line in London. The industry was pushed into a period of turmoil following the Brexit vote in June 2016. Fears of a lack of EU labour post-Brexit were cited as a key reason for the uncertainty. Despite this, the industry has been performing better than expected in the months since, leading to cautious optimism in some quarters. Construction industry