What is ice damming, and why is it a concern?

Ice damming is a phenomenon that occurs when there is a build-up of ice on the eaves of a roof. This typically happens when warm air from the interior of a building heats the roof, causing the snow on top to melt. The melted water then runs down towards the roof's edges. However, if the roof's eaves are cold, the water can refreeze into ice. Over time, this process creates an ice dam that prevents further water from draining off the roof.

The concern with ice damming is significant because as the ice builds up, the water behind it can begin to pool. This pooled water can eventually back up under the shingles or roofing material, leading to water leaks inside the building. These leaks can cause damage to walls, ceilings, insulation, and can create a risk for mold growth, resulting in costly repairs. Therefore, ice damming is not only a concern for the integrity of the roofing system itself but also poses risks to the overall structure and safety of the home.