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
Building Materials Holding Corporation Building Materials Holding Corporation Building Materials and Construction Solutions (BMC) is an American construction supply company with corporate headquarters in Raleigh, North Carolina. The company operates principally in the South and West regions of the United States and has in excess of 10,000 employees. BMC was founded in 1987 as a building materials distributor. BMC distributes building materials, manufactures building components, and provides construction services across the U.S. Ready-Frame was launched in 2013. This service provides professional builders with computerized pre-cut framing lumber for constructing roof and floor trusses. The online business, BuildwithBMC.com, was launched in 2015 and carries over