The lifespan of a commercial flat roof varies greatly, especially when the building resides in a damp, rainy environment or areas with high heat exposure. However, when they are constructed from appropriate materials, commercial flat roofs in Vancouver typically last 20 years, with maintained metal roofs offering a lifespan of 40 years or more. So, be sure to consider the replacement needs of your material and its maintenance schedule before deciding the route you want to take.