When it comes to roofing, what you need is longevity. You need a roof that can serve you well for many years, even decades — and a built-up roof offers exactly that! A built-up roof is a composite structure of multiple layers of materials, such as fiberglass or organic bitumen-saturated felts and asphalt, laminated together. They add durability to traditional tar and gravel roofs, making them more resilient in severe weather.