A green roof, also known as a living roof, is a roofing system covered with vegetation and soil or a growing medium, planted over a waterproof membrane. It helps manage stormwater, improve insulation, and enhance aesthetics. Over time, a green roof may need repairs due to issues like clogged drainage, plant die-off, or membrane damage caused by root penetration or aging. These problems often happen if the roof isn’t properly maintained or if the choice of plants isn’t suitable for the local climate. Homeowners can perform simple diagnostics by checking for pooling water, patches of dead vegetation, or visible signs of membrane wear along the edges. Walking around the roof carefully to spot any structural shifts or sagging areas can also be a helpful DIY safety check, but avoid disturbing the plants and growing material too much.
Green roof repairs can vary widely in cost depending on the problem’s severity, ranging from minor maintenance tasks like clearing drains and replanting vegetation (often a few hundred dollars) to more significant membrane repairs or full system replacement, which can cost several thousand dollars. It’s advisable to call a professional roofer experienced in green roofs when you notice persistent drainage issues, widespread plant die-off, or visible water damage inside the home. When consulting a contractor, ask about how their repair work complies with your roof’s existing warranty and whether they use root barriers to prevent future membrane damage. It's also helpful to inquire about a maintenance plan to keep your green roof healthy and reduce the risk of costly repairs in the future.