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 Design+Construction Building Design+Construction Building Design+Construction (BD+C) is a trade publication and web site serving the information needs of designing, building, and owning firms in the non-residential construction industry. Established in 1950, "Building Design+Construction" is published 12 times per year. In 2010, former owner Reed Business Information sold the magazine to MB Media, who was acquired by SGC Horizon, LLC. "BD+C"'s editorial focus is on the Building Team—architects, engineers, contractors, and building owners/developers. Each issue provideS the industry story on the process of how significant projects get built, from how Building Teams solve problems and deliver a project on time and on