ZIP System roof and wall sheathing panels are oriented strand board (OSB), wood structural panels with built-in protective overlays that eliminate the need for building wrap or roofing felt. Install the panels, tape the seams with ZIP System tape, and the building is rough dried-in. When used on a wall, ZIP System sheathing and tape functions as a combination wall sheathing and code-recognized water-resistive and air barrier. When ZIP System is used for roof applications, felt underlayment is not necessary. In wall and roof coverings systems requiring multiple layers of water-resistive barriers or underlayment, ZIP System sheathing and tape is intended to replace the first layer only.