Sill pan flashing is the last line of defense against water that leaks into walls while building a home. The pan flashing is used to collect and direct—collect bulk water and direct it outside and away from the door or window frame.

What is the flashing on a window?

Window flashing is a thin continuous piece of material that is installed to prevent water from getting into a structure from an angle or joint near windows. … Wall flashing is typically found around windows and doors.

Do I need a sill for Windows?

Window sills are a necessity. Without the window sill, the window, wall and floors inside the home would all become water damaged. … In other words, a window without a sill would not be a window at all. Window sills have been a traditional part of all windows for thousands of years.