If "GB12xzip" refers to a specific software file, drive, or different product, please provide more context so I can narrow down the correct guide for you. ZIP System® R Sheathing - Installation Manual
: Secure panels to framing members using code-approved fasteners, ensuring they are driven flush with the panel surface. 2. Seam Sealing (ZIP System™ Tape) GB12xzip
: ZIP System Roof & Wall sheathing is often intended to replace the first layer of underlayment required by building codes, though local regulations may vary. If "GB12xzip" refers to a specific software file,
: Install panels with the built-in water-resistive barrier facing outward. or different product