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
Development Fund of the Swedish Construction Industry Development Fund of the Swedish Construction Industry Employers and employees founded the Development Fund of the Swedish Construction Industry (Swedish: Svenska Byggbranschens Utvecklingsfond, SBUF) jointly in 1983. SBUF is the construction industry's organisation for research and development with approximately 5,000 affiliated companies in Sweden. SBUF aims to promote development in the building process to create more businesslike conditions for contractors enabling them to make use of research and conduct development work. SBUF aims to promote development in the building process to create more businesslike conditions for contractors enabling them to make use of research and conduct development work. SBUF operates