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
Design quality indicator Design quality indicator The Design Quality Indicator (DQI) is a toolkit to measure, evaluate and improve the design quality of buildings. Development of DQI was started by the Construction Industry Council (CIC) in 1999. It was initiated in response to the success of Key Performance Indicators devised for assessing construction process issues such as timely completion, financial control and safety on site by the construction industry's Movement for Innovation (M4I). The aim of the DQI systems was to ensure that the M4I's indicators of construction process were balanced by an assessment of the building as a product. The Science Policy