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
Rinker School of Building Construction Administration, as a result of Rinker's prerequisite and upper division coursework, which satisfies a majority of the minor's requirements. Rinker School of Building Construction The M. E. Rinker, Sr., School of Construction Management at the University of Florida prepares graduates for careers in the construction industry. The core curriculum includes a mix of technical, managerial, and business courses. Graduates receive a comprehensive education including theory and practical applications. Courses are offered leading to the Bachelor of Science in Building Construction, the Master of Building Construction or Master of Science in Building Construction, and the Doctor of Philosophy degree. The Rinker