| Keywords |
Building insulation materials; Thermal resistance; Accelerated laboratory test methods; Building energy |
| Abstract |
Thermal property degradation of building insulation materials were analyzed by accelerated laboratory methods defined in ISO 11561 to verify thermal resistance change experimentally. Selected samples varied within one to three days from production date. Primary tests were executed for more than 3,000 hrs for XPS (Extruded PolyStyrene) and Rigid poly urethane, respectively. Secondary tests were carried out for approximately 1,500 hrs for special and first grade of XPS. Measured values of thermal resistance were analyzed to estimate the thermal resistance values of 25 year-time-lapse and to compare with 25 year-average value. It was observed that thermal property of special grade XPS was estimated to decrease after 25 years by 37 to 41% from the initial value. Grade 1 XPS showed relatively better results as of 21 to 27%. In addition, Rigid poly urethane 40K revealed property degradation pattern of 21 to 27% from the production stage. |