What is a potential hazard to asphalt shingles when debris accumulates on the roof?

Accumulated debris on a roof with asphalt shingles can lead to increased heat retention. When debris such as leaves, branches, or dirt gathers on the surface, it can trap heat. This heat can cause the shingles to become excessively warm, leading to a variety of issues such as premature aging, warping, or even failure of the shingles.

Additionally, this heat retention can cause the asphalt to soften, which may result in the shingles losing their structural integrity over time. This effect is particularly pronounced in warmer climates, where the combination of sunlight and trapped debris significantly raises the roof temperature. Maintaining a clean roof allows for better heat dissipation, which helps to prolong the life of the roofing material.

The other options presented do not accurately capture the specific hazards associated with debris accumulation on asphalt shingles. For instance, changes in color and improved insulation are not direct consequences of debris on the roof, while reduced weight is not a relevant factor since accumulated debris adds weight rather than decreasing it.