Which drainage feature is important for BUR roof systems?

In BUR roof systems, maintaining a proper slope is critical to ensure effective drainage. The design and installation of the roofing system must incorporate an adequate slope to facilitate the flow of water toward drainage points, such as scuppers or drains. When water can flow freely off the roof, it prevents pooling, which can lead to various issues such as leaks, structural damage, and a reduced lifespan of the roofing materials.

Water pooling can compromise the integrity of the roofing system since built-up roofs are designed to shed water rather than retain it. Stagnant water can lead to accelerated deterioration of the roofing materials, increased risk of mold and algae growth, and potential structural wear due to the added weight and moisture retention. Ensuring a proper slope helps mitigate these risks and prolongs the life of the roof.

While the other choices, such as spacing between tiles, types of roofing materials used, and location of vents, are all relevant aspects of roofing systems, they do not directly address the crucial need for proper drainage like slope does. Proper drainage is fundamental to ensuring the roof performs correctly and remains reliable over time.