ZIP System® is designed to out-perform traditional systems that include structural panels with a secondary barrier such as house wrap or felt. Years of development, lab testing and real-world field trials conducted by a team of industry respected experts have helped us produce the next generation of wall and roof sheathing to eliminate construction headaches for builders, provide moisture management during and after construction, and to provide comfort and energy efficiency for the homeowners. ZIP System is an excellent felt and house wrap alternative.