40 Hour Property and Building Inspection Practice Test

What is a potential issue with improperly installed valley flashing?

1. Increased installation costs

2. Potential water backup and leaks

3. Decreased energy efficiency

4. Reduced roof ventilation

The correct answer is: Potential water backup and leaks

Improperly installed valley flashing can lead to significant issues regarding water management on a roof. The primary function of valley flashing is to direct water away from the valleys where two roof slopes meet, ensuring that water flows off the roof and into the gutters without causing any damage to the underlayment or decking beneath. When valley flashing is installed incorrectly, it can create areas where water may pool or back up instead of draining properly. This improper drainage can result in leaks, which can cause water damage within the structure, including issues like mold growth, damage to insulation, and deterioration of building materials over time. Additionally, the presence of water within these areas can exacerbate any weaknesses in the roofing system, leading to more severe complications down the line. Therefore, the potential for water backup and leaks is a critical concern that highlights the importance of ensuring proper installation of valley flashing. While factors like installation costs, energy efficiency, and roof ventilation are relevant to roofing considerations, they do not directly address the immediate and severe implications of improperly installed valley flashing like water intrusion does.