window leaks: Window Stains: When To Be Concerned - 08/12/11 11:30 PM
Water stains on window sills is often a source of anxiety for home buyers, and it's the home inspector's job to help determine if the stains are the sign of a major problem or not. There are three common causes of water stains on windows:
Leaving the windows open.  The windows get left open, and water pours in through the window during a rain storm.  This type of staining will often leave fairly uniform water staining across the window sill. Condensation.  If it's a wood window, you'll see stains at the corners of the window sashes and the window sills if … (29 comments)