Salt Depot VRR4PK Viper Roof Roll, Off-White/White

VIPER ROOF ROLL™ is our premium, non-corrosive, solution in preventing ice dam's in the winter. Each box contains four rolls (approximately 21 in L) that contain CMA (calcium magnesium acetate). Place the Viper Roof Rolls 12 to 24 in above your downspouts or where you generally have ice build-up through the winter months. The time released roof roll will release CMA and work from the bottom up so that ice doesn't adhere to the surface creating an ice dam or build-up. Calcium magnesium acetate is chloride and salt-free and will not harm roof components.