This study focused on the influence of heights and directions on the soiling of building external finishing materials. Also this study measured the driving rain which could be the most important factor on the soiling of external materials. The heights were set to 31,55,79,108m and directions were north, south, west, east. The amount of driving rain Rv was expressed by the formula, Rv=0.0527RhVD, Rh=the amount of horizntal rain, V=wind speed, D=component factor of wind direction. The degree of soiling of materials increased with the increasing of Rv, however the long period exposure with the high amount of Rv, the washing effect was occurred for some materials and Y-value become high and closed to the initial value.
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