What is a common effect of improper roof drainage?

Water pooling leading to leaks is a common effect of improper roof drainage. When a roof lacks adequate drainage, water can accumulate in certain areas rather than flowing off the roof as intended. This pooling creates a higher risk of water infiltrating the roofing materials and penetrating below the surface, potentially leading to leaks. Over time, the presence of stagnant water can deteriorate the roofing system, weakening materials and allowing for mold growth or other forms of water damage, which can compromise the overall integrity of the building.

In contrast to this correct answer, increased insulation efficiency, reduced environmental impact, and enhanced roof durability do not directly result from improper roof drainage. Instead, these are typically benefits associated with well-designed and functioning roofing systems that effectively manage water runoff, thereby protecting the roof structure and improving overall building performance.