Green roofs use this opportunity and have confirmed to double and even three-way the life span of your rooftop. The obstacle of plant assists shield the water resistant membrane beneath and ensure your rooftop's life expectancy lasts well for decades. An appropriately installed, irrigated and kept living roofing system should last for as much as 50 years. If the plants on your roof covering are dying, or the weeds are taking over, you need to call P&amp