Why are repaired areas considered vulnerable on a roof?

Repaired areas on a roof are considered vulnerable primarily because they may not be as strong as the original material. When roofing materials are repaired, the new materials used or the methods employed may not fully replicate the durability and integrity of the original roof. Factors such as the quality of the repair materials, the skill of the person performing the repair, and the conditions under which the repair was made can all impact the strength and reliability of the repaired area.

In contrast, the assertion that repaired areas always leak is a generalization that does not hold true for all repairs; many can be done effectively with proper techniques and materials. The visibility of repairs during an inspection is also not a definitive factor; inspectors can often identify repaired sections, even if they are not immediately obvious. Finally, the idea that only new roofs are reliable ignores the potential for well-maintained older roofs to perform adequately for many years. Hence, the concern with repaired areas focuses on their potential weakness compared to the original materials rather than an inherent flaw in all repairs or in older roofs.