FROST DAMAGE OF ROOF TILES IN RELATIVELY WARM AREA IN JAPAN

Even in relatively warm areas in Japan, frost damage of roof tiles occurs. In the field of material scienceand technology, the mechanism of frost damage has been investigated. In this study, frost damage toroof tiles is considered from a thermal point of view. A temperature drop due to nocturnal radiation isestimated as one of the most important factors. The influences on the temperature profiles areexamined by numerical analysis. Next, an accelerated aging test for roof tiles and a numerical analysisof the test are carried out. The results show there is a significant difference in temperature dependingon the location even in the same tile. The difference results from the amount of freezing water on thesurface of and inside the tile.