What type of building material can alter drainage patterns on roofs?

Metal roofing materials can significantly alter drainage patterns on roofs due to their design and installation characteristics. When metal panels are installed, they often have a smooth surface that promotes water runoff, which can change how water flows across the roof compared to other materials that might absorb or retain water. The steepness of the roof, along with the configuration of the metal panels, can direct rainwater more efficiently to particular drainage points, potentially leading to altered drainage patterns on the building.

Additionally, because metal roofs are often installed at specific pitches to facilitate drainage, they can exacerbate or mitigate drainage issues depending on the overall design of the roof system. When considering the impact of building materials on drainage, it’s essential to recognize how various characteristics influence water movement, a crucial aspect of maintaining a building's integrity and preventing water-related problems.