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Window sills are the horizontal boards that sit directly underneath the windows, both inside and outside the house. Most sills are made of wood, but they can be vinyl or, on older homes, brick or stone.
Deteriorating exterior sills are more than just unsightly. They can, and often do, allow water to seep into your walls and cause the window frames to rot as well as lead to mold and mildew. If a home inspector sees a window sill that's in need of repair, he or she will examine the rest of the window frame and adjoining wall to see if there is any water damage.