Exposed fastener metal on a metal roof refers to the screws or nails that are visible on the surface, holding the panels in place. These fasteners can become problematic if their sealing washers wear out or if the fasteners work loose, creating small holes where water can seep in. Ponding water happens when water collects in low spots on a roof rather than draining properly, often because of poor slope, debris buildup, or structural sagging. Over time, ponding water can accelerate corrosion around exposed fasteners and cause leaks or even rust damage to the roof panels. For a simple DIY check, look for loose or missing fasteners and inspect for rust or damp spots inside your attic after a rain. Also, watch for water pooling visibly on the metal panels after a storm. Fixing small leaks caused by fasteners often involves tightening screws or replacing worn seal washers, but ponding water usually requires improving drainage or addressing the roof’s slope, which can be more complex.
If you see persistent water pooling or recurrent leaks around fasteners, it’s a good idea to call a licensed roofing professional. They can assess whether the roof panels need partial replacement or if structural adjustments are needed to improve drainage. When speaking with a roofer, ask how they plan to ensure the fasteners will remain sealed long-term, and whether any warranty coverage applies when replacing screws or tightening panels. Also, inquire about how they will address the root cause of ponding water: Are they suggesting adding tapered insulation or fixing framing to improve slope? These questions help ensure any repairs are durable and code-compliant, protecting both your roof’s integrity and your warranty.