Watertightness (driving rain)
Watertightness against driving rain describes the resistance of a building element (e.g. a window, glass wall or door) to driving rain, i.e. rainfall whose vertical direction of fall is altered by the wind. It is evident that the dynamic pressure exerted by driving rain is determined not only by the intensity of the rain itself, but also by the strength of the wind.
When windows and doors are tested for their watertightness against driving rain, the building elements are sprayed under a pressure of 0 to 600 Pa for between 15 and 55 minutes. The classification is made using numbers and letters, whereby the number from 1 to 9 corresponds to the test pressure and the letter (A or B) to the respective test method. A - unprotected windows and doors (e.g. not protected by a canopy), B - a partially protected type of construction.
When windows and doors are tested for their watertightness against driving rain, the building elements are sprayed under a pressure of 0 to 600 Pa for between 15 and 55 minutes. The classification is made using numbers and letters, whereby the number from 1 to 9 corresponds to the test pressure and the letter (A or B) to the respective test method. A - unprotected windows and doors (e.g. not protected by a canopy), B - a partially protected type of construction.
