Button punch

Button punching is a metalworking technique used to create a mechanical interlock between two metal panels, typically used in standing seam metal roofing systems. The process involves using a punch tool to create a small dimple or “button” on one panel and then crimping the adjacent panel into the dimple using a mechanical tool. This creates a secure connection between the two panels and helps to prevent water infiltration and air leaks. Button punching is a common method for creating standing seam roof panels, which are used in both commercial and residential roofing applications.