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
Construction Research and Innovation Strategy Panel funding with sectors such as aerospace and pharmaceuticals. The Design Task Group's report was turned into a book chapter by the group's chair, Giles Oliver. After chairing the Task Group on Value, Richard Saxon went on to publish "Be Valuable" through the industry body Constructing Excellence, while the Task Group report was used as the source of an academic paper. The Pearce Report "The Social and Economic Value of Construction" (2003) was used for a special issue of the journal "Building Research & Information", edited by Jim Meikle. Construction Research and Innovation Strategy Panel The Construction Research and Innovation Strategy