Matt Risinger discusses head flashing for windows, covering both how to order them and how to measure for your windows. If you have a house with lower over hangs, or if it is on the coast with a lot of exposure, you want a head flashing on every window. The head flashings are designed to direct water out and around the window, as you don't want water running to the window flange. So how do you order head flashings? Follow these easy measurement instructions to draw up your head flashings and send them to the sheet metal or roof company that will bend them for you. When working with casement windows you need to pay particular close attention. If you are working with an architect, he or she may have flashing specifications. Risinger also covers the materials options for head flashings and the gauges you can work with, as well a recommendation for particular head flashing, in including the custom ordering of head flashing, based on the particular need for your window project.