Exposed fastener metal roofs use screws or nails with rubber washers to attach metal panels directly to the roof deck. While they’re popular for their affordability and ease of installation, these exposed fasteners can be a weak spot for leaks, especially around skylights. Over time, the rubber washers may dry out, crack, or compress, losing their sealing ability. Additionally, if the fasteners aren’t properly tightened or become loose due to roof movement, water can seep through. Skylights add complexity because their frames penetrate the roofing surface, requiring careful flashing installation to prevent leaks. To check for potential issues yourself, inspect the fastener heads and washers for visible wear or gaps, and look around the skylight edges for any signs of water stains, rust, or loose flashing. It’s safe to do these visual inspections from a sturdy ladder and a good vantage point, but avoid walking directly on the metal panels to prevent damage.
If you notice worn washers, loose screws, or suspect flashing problems around the skylight, it’s wise to call a professional roofer promptly. A qualified contractor will be able to tighten or replace fasteners with premium, weather-resistant washers and ensure that skylight flashing is correctly sealed and integrated with metal roofing panels. When discussing repairs, ask your contractor how they will address fastener corrosion and if they plan to replace all worn washers rather than just tightening screws. For skylight-specific issues, inquire about the type of flashing used and if it’s compatible with the existing metal roof system. These questions help ensure repairs are done thoroughly and with attention to warranties, as improper fixes can void both roofing and skylight manufacturer guarantees.