EM9 Window installation - an evaluation method for weathertightness assessment of the window to wall junction (May 2021)

EM9 provides a test for the management of inadvertent water ingress around the perimeter of an external window (or glazed door) installed into the structure of a wall, using typical residential techniques. It provides a specific weathertightness performance test for window installations to add robustness to the existing E2/VM1 test.