R-value (insulation) contain no trapped CFCs or HFCs (e.g., half-pound low density foams). On certain brands, twenty-year tests have shown no shrinkage or reduction in insulating value. This has led to controversy as how to rate the insulation of these products. Many manufacturers will rate the R-value at the time of manufacture; critics argue that a more fair assessment would be its settled value. The foam industry adopted the LTTR (Long-Term Thermal Resistance) method, which rates the R-value based on a 15-year weighted average. However, the LTTR effectively provides only an eight-year aged R-value, short in the scale of a building that
Building and Construction Authority BCA International, a wholly owned subsidiary formed by BCA, paves the way for local construction companies to offer a full scope of expertise and value-added services to assist overseas governments and clients in developing excellent built environments. BCA also established a Construction Productivity Gallery and a Centre for Lean and Virtual Construction to guide and advise construction firms on the latest construction technologies and re-engineering processes to achieve time and labour savings. This is in line with Singapore’s national productivity drive, where BCA introduced a S$250-million Construction Productivity and Capability Fund (CPCF) in June 2010 to help the construction industry