What is a metal roof covering with the ribs oriented downward called?

A metal roof covering with the ribs oriented downward is referred to as a standing seam. This roofing system features vertical panels that rise above the plane of the roof, with seams that are elevated and interlock. The design allows water to flow off the roof efficiently while also providing resistance against wind uplift and water infiltration. The standing seam configuration is particularly effective for both weatherproofing and durability, making it a popular choice for commercial and residential applications.

The distinct vertical ribs also contribute to the roof’s aesthetic appeal, providing a modern look. In addition, the upward orientation of the seams allows for expansion and contraction due to temperature changes, which is beneficial for maintaining the integrity of the roof over time. This aspect distinguishes standing seam roofs from other types, which may not have the same capabilities for managing thermal movement.