Tab shingles are a common type of asphalt roofing material characterized by their rectangular shape with cut-out tabs. They can sometimes contribute to leaks around skylights, especially if the flashing or sealant has aged poorly or was improperly installed. Skylight leaks are often caused by water seeping through gaps where the shingles meet the metal flashing or the skylight frame itself. Over time, exposure to sunlight, freezing temperatures, or heavy rain can cause the shingles to lift, crack, or curl, creating pathways for water to penetrate. Additionally, debris buildup around skylight edges may trap moisture, accelerating wear and leading to leaks. A simple way to diagnose these issues is to inspect the area during or right after a rainstorm; if you notice wet spots on the ceiling below or feel moisture inside the skylight frame, you likely have a leak. Performing a visual check for damaged shingles or deteriorated flashing can help identify problem areas.
For a safe DIY check, you can gently lift the shingles around the skylight to look for cracked or missing sealant and ensure the flashing is securely fastened and intact. Avoid walking directly on the skylight glass and be cautious when maneuvering on the roof to prevent damage or injury. If you find cracked sealant or suspect flashing issues, it’s best to call a professional roofer who has experience with both roofing and skylight installations. When contacting a contractor, ask if they have experience repairing leaks specifically around skylights with tab shingles and how they plan to ensure a water-tight seal without voiding your roof’s warranty. Another important question is whether they will inspect and possibly replace damaged flashing or if a simple reseal will suffice for a long-lasting repair.