Debris accumulating in a metal valley will accelerate _____.

Debris accumulating in a metal valley will accelerate corrosion due to several factors. Over time, materials such as leaves, dirt, and other organic matter can trap moisture in the valley, creating a persistent wet environment. This moisture is especially detrimental to metal surfaces, as it can promote electrochemical reactions that lead to rust formation.

In addition to moisture, debris can also hold pollutants and contaminants that may contribute to the corrosion process. The presence of organic materials can further exacerbate this situation, as they can decompose and produce acids that further attack the metal surfaces. Consequently, when a metal valley is not kept clear, the combination of moisture retention and chemical exposure significantly increases the rate at which corrosion occurs.

Understanding how debris affects metal surfaces is crucial for home inspectors, as it informs them on the maintenance that homeowners should prioritize to prevent long-term damage to roofing components.