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By definition, flashing tapes are thin continuous impervious materials that prevent water and air infiltration within the building envelope. By taping seams and flashing rough openings, builders ensure a tight seal to prevent water from entering a building and create air barriers that lower AC costs and improve interior air quality. In recent years new “flexible flashing” tapes have been introduced to the marketplace. These new materials have significant advantages over traditional flashing materials. Unlike most metal flashings, for example, flexible flashings conform easily to unusual shapes, i.e., folding to form a waterproof end-dam on a rough windowsill during window installation. In theory, a properly installed flashing system solves a multitude of moisture and airflow problems around windows, doors, and nail holes, a property that has made them especially useful on roofs.