• A thin, impervious sheet of material placed in construction to prevent water penetration or direct the flow of water. Flashing is used especially at roof hips and valleys, roof penetrations, joints between a roof and a vertical wall, and in masonry walls to direct the flow of water and moisture.

Real Estate

  • noun strips of sheet metal, usually lead or aluminium, fitted on a roof, e.g. on the ridge of a slate roof, or around a window frame to provide a waterproof seal