A green roof, which is covered with vegetation and growing media, requires careful attention to flashing details to prevent leaks and ensure longevity. Flashing is the material, often metal, that seals the areas where the green roof meets walls, chimneys, vents, and other roof penetrations. Proper flashing keeps water from seeping underneath the planting layers and damaging the waterproof membrane below. Flashing issues on green roofs often happen because root growth can puncture or displace poorly installed flashing, or because the weight of the soil and plants can cause shifting over time. When inspecting your green roof, look for any visible gaps, bent or loose flashing, or signs of water stains inside the building, as these can signal flashing failure. A simple, safe DIY check is to use binoculars to inspect flashing edges and seams, especially after heavy rain or strong winds, without climbing on the roof itself to avoid damaging the plants or risking injury.
If you’re unsure about how to properly care for or maintain your green roof’s flashing, it’s best to call a roofer with experience in vegetated roofing systems. When selecting a contractor, ask if they have worked with green roofs specifically and what materials they recommend for flashing in this environment, since compatibility with root barriers and waterproof membranes is crucial. Also, inquire about how they plan to secure the flashing to handle soil weight and plant growth without causing damage over time. Ensuring the roofing professional understands warranties tied to your green roof materials and flashing installation will protect your investment and avoid future costly repairs. This approach keeps your green roof healthy, attractive, and watertight for many seasons.