4'x 8' sheet. Thanks to our relentless passion for creating better building solutions, ZIP System building enclosures provide built-in water, air and thermal control along with streamlined installation. As a result, our family of structural and sealing products makes it easy to meet your highest standards, satisfy new energy codes and just plain build better homes. A revolutionary new approach to building enclosures, ZIP System sheathing and tape streamlines the weatherization process with an integrated air and water-resistive barrier that delivers moisture and air protection in one easy-to-install system.