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 build up a skilled workforce, adopt more advanced construction technologies, and enhance building capability in niche areas. BCA strongly promotes the adoption of Building Information Modelling (BIM), which allows professionals to work on a building project digitally before it is built. BCA targets to get 80 per cent of the industry to use BIM widely by 2015, and is working with the public sector to take the lead in driving greater BIM adoptiont. Building and Construction Authority The Building and Construction Authority (Abbreviation: BCA; ) is a statutory board under the Ministry of National Development of the Singapore Government. It