Also called “standing seam,” these systems have no exposed screws, making them the most weathertight and maintenance-free systems. Standing seam is a good choice for commercial and high-end residential projects but require higher-skilled craftsmen and more labor costs for installation.

Exposed fasteners systems use a specifically designed fastener with a sealing washer to fasten through the panels. These panels require less labor for installation and are an economical choice for many residential and some light commercial projects.