Abstract
Proper knowledge of exposure severity to wind driven rain and its variation within a wall is indispensable for weather-tight design of external walls. Based on his previous work on estimation of impinging angle of driving rain against wall surfaces, the author has developed a method for calculating rain impingement distribution over an external wall of low-rise residential buildings having eaves overhangs of various shapes and sizes, using hourly records of rainfall and wind for the building site and taking the sheltering effect of the overhangs into account. Recent findings on rain-wetting patterns over a wall of cubic-shaped model building and its variation with wind direction which were obtained through computational fluid dynamics techniques were also introduced in determining the rain deposit distribution in the exposed areas.
