When asphalt shingles lack adequate insulation, the increased risk of damage stems primarily from temperature fluctuations and moisture buildup. Proper insulation helps maintain a consistent temperature within the attic and roof space. Without it, cold air can lead to situations where ice dams form in winter, causing water to back up under the shingles and potentially leading to leaks.
Additionally, insufficient insulation can result in higher heat levels during the summer months. This excessive heat can degrade the shingles more quickly, leading to warping, blistering, or cracking. The combination of these factors contributes to an overall increase in the chance that the shingles will sustain damage over time, thus making the answer regarding the increased risk of damage suitable in this context.