Ice dams are as ominous as they sound. They can ruin your roof, cause flooding within your house, and cost hundreds of dollars in damage. If mold sets in, the cost could run into the thousands.  The process of melting snow refreezing on the edge of your roof forms ice dams. This frozen snow hardens into a ‘dam’ that causes the rest of the melting snow behind it to back up, causing flooding and other damage to your gutters, roof, insulation, attic, and other areas of your house, depe...