How does metal roofing handle rain compared to built-up roofs?

Metal roofing is designed with a sloped structure that facilitates the efficient drainage of rainwater. Unlike built-up roofs, which can be flat and may struggle with proper drainage leading to potential water accumulation, metal roofs are installed to encourage water runoff. This slope allows rain to flow off the roof surface quickly, preventing pooling or standing water that can cause long-term issues such as leaks or decay.

The materials used in metal roofing also contribute to its effective drainage capabilities. The smooth finish of metal surfaces minimizes surface tension, allowing water to slide off easily. Additionally, the seams in metal roofing systems are typically engineered to be watertight, further enhancing their ability to direct water away from the roof. In contrast, built-up roofs, which are layered with materials that can absorb moisture, may not drain effectively and can create challenges such as water retention and damage over time.

Therefore, metal roofing is an excellent choice in areas with significant rainfall, ensuring that rainwater is adequately drained away from the structure, thus maintaining the roof's integrity and durability.