A green roof, also known as a living roof, is a roofing system covered with vegetation planted over a waterproof membrane. It not only adds beauty and insulation but also helps manage stormwater and reduce urban heat. However, green roofs can face several common failure modes such as water leakage, poor drainage, plant death, and structural stress. Water leakage often arises from membrane damage or improper installation, allowing moisture to seep into the building below. Poor drainage can cause water to pool, which leads to root rot or unstable substrate layers. Plant failure usually happens because of inadequate soil depth, wrong plant selection, or lack of proper maintenance, such as regular watering and weeding. Structural issues may become apparent when there is excessive weight from saturated soil or snow, which can stress the building’s roof frame.
To diagnose typical problems yourself, safely inspect the roof during dry weather, looking for signs of standing water, dead patches of vegetation, or soft spots on the roof surface which might indicate leaks. Check that drainage outlets are clear and free of debris. DIY checks should not involve walking heavily on the green roof unless you know it’s built for foot traffic. If you see persistent wet areas, extensive dying plants, or suspect leaks inside your home such as water stains on ceilings, it’s wise to call a professional roofer with green roof experience. When consulting a contractor, ask what kind of waterproof membrane they use and how it is warranty-protected because this determines long-term durability. Also, inquire about their recommended plant species for your climate and maintenance schedule to keep your green roof healthy and leak-free.