Green roofs supply this opportunity and have confirmed to increase or even three-way the life span of your rooftop. The obstacle of plant helps protect the water resistant membrane layer below and ensure your roof's life expectancy lasts well for years. A properly set up, irrigated and maintained living roof must last for approximately 50 years. If the plants on your roofing system are passing away, or the weeds are taking over, you need to call P&amp