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
Green building and wood SNS-activated state have a negative effect on the body’s physiological and psychological health. The study supports wood’s value as a tool in evidence-based design (EBD) – a growing field that seeks to promote health and other positive outcomes such as increased productivity and well-being based on scientifically credible evidence. So far, EBD has focused largely on healthcare and, in particular, patient recovery. Green building seeks to avoid wasting energy, water and materials during construction. Design and building professionals can reduce construction waste through design optimization, using right-sized framing members, for example, or pre-manufactured and engineered components. The wood industry reduces