Your roof is made of layers of different materials, and each serves an important purpose in keeping your house sealed and safe. This is primarily to prevent leaks from damaging your building materials and interior. For this same reason, roofs offer an overhang designed to specifically redirect water away from the structure of the house. Vents, upper windows, chimneys, and skylights also must be carefully included in the weatherproofing design of any home. Flashing is what your roof uses to connect all the pieces, covering seams in roof assets and ensuring that your waterproofing prevents 100% of leaks. Properly installed flashing is important because doing it wrong can leave these seams, and your home, unprotected.