Abstract
Even in relatively warm area in Japan, frost damage of roof tiles occurs. Our research deals with the frost damage from a thermal environmental point of view.Condensation on the external surfaces of roof tiles, which is caused by a temperature drop due to nocturnal radiation, is estimated as one of the most important factors influencing the frost damage. The frequency of condensation and the amount of condensed water were calculated by a numerical analysis.The influence of the parameters, such as the outside wind speed, inclination angle and the orientation of the roof, is investigated. It is clarified that a surface condensation on the roof tiles occurs very frequently even in a warm area of Japan.
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