Torch-down roofing is a popular waterproofing method commonly used on flat or low-slope roofs, involving layers of modified bitumen that are heated and adhered with a torch flame. Flashing in torch-down roofing refers to the material used to seal roof edges, corners, and penetrations—such as vents and chimneys—to prevent water infiltration. Because torch-down membranes are heat-applied, flashing must be installed carefully to ensure a durable, watertight seal without damaging the surrounding surfaces. Flashing issues typically occur because of poor adhesion, improper overlaps, or thermal expansion causing gaps over time. Simple diagnostics include visually inspecting flashing edges for cracks, blisters, or lifting, especially after heavy rain or seasonal temperature changes. Safe DIY checks involve gently running your hand along flashing seams to detect loose or bubbling areas and looking for water stains or damp spots inside the attic near flashing points.
If you notice any separation, cracks, or bubbling at the flashing details or have persistent leaks near roof edges or penetrations, this is the time to call a professional roofer experienced with torch-down systems. Ask your contractor how they plan to overlap the flashing with the base membrane and whether they use cold-applied adhesives at sensitive points to minimize fire risk and improve warranty compliance. It’s also important to inquire about how they seal corners and ensure proper drainage away from flashing areas. A skilled roofer will use carefully fitted pre-formed flashing or custom metal flashings that integrate smoothly with the torch-down membrane, providing long-lasting protection against water intrusion. Always verify that any repairs or replacements maintain the manufacturer’s warranty requirements to avoid future complications.