RoofMelt 60 Pack Roof Ice Dam Melter. Made from calcium chloride and is easy to use. Simply toss a tablet on the roof and let it do the work. No ladders or extension equipment are needed. It is a proven reliable and inexpensive product. Toss 1 tablet on every square foot of problem area. It begins working the hour after applied to problem area. It has no long term adverse effects to the roof or surrounding area. Comes in a bucket.