Nothing says winter quite like the sight of a roofline studded with shimmering icicles. Far from being a benign hallmark of the season, however, icicles may indicate the presence of a winter hazard—an ice dam. When icy buildup forms on the edge of your roof, it leaves rain and snowmelt without a path down to the gutters and out to the ground. As a result, your roof may become compromised, allowing incursion from not only water, but also pests such as termites and carpenter ants. Inspect your roof for ice dams throughout the cold months and, if necessary, pursue options for prevention.