Which of the following is not considered a manufacturing defect in roofing?

Weathering glaze does not qualify as a manufacturing defect in roofing because it relates to the natural aging process of roofing materials rather than an issue arising from the manufacturing process itself. Weathering can occur due to various environmental factors, including exposure to sunlight, rain, wind, and temperature fluctuations. These elements lead to changes in the aesthetic or performance characteristics of the roof that are anticipated over time, rather than indicating a flaw in how the roofing materials were produced.

On the other hand, cracked tiles and inconsistent color could be considered manufacturing defects because they indicate problems that occurred during the production of the roofing materials. Cracks may suggest a flaw in the material quality or the process of creating the tiles. Inconsistent color can result from poor quality control during manufacture or discrepancies in the raw materials used, which are signs of a defect.

Incorrect installation pertains to human error during the process of putting the roofing materials in place rather than any issue with the actual products. It's not a manufacturing defect since it stems from the methods or skills of those applying the roofing system.