EVS-EN 13051:2002

This standard defines the method to be used to check for any points of  water leakage that may occur in curtain walling when installed on a building. It is a supplementary test not required for classification purposes. It is intended for use primarily where water leaks have already occured. It may also be used on new installations, when specified.
It describes how an area of curtain walling that is installed on a building shall be subjcted to a continuous film of water over its outside face.
Windows and doors incorporated into the curtain walling may be similarly tested.