Several things about ice dams:
Roofer J is closer with his 300.00 for the first hour price. Remember you need to cover your payroll, overhead and the liability is HUGE. So easy to get hurt doing snow removal. Also keep in mind that if you are doing things by the book, your men are tied into permanent roof anchors and someone correct me if I'm wrong but for most Insurance Companys Snow Removal is a different thing altogether. Meaning if your guys get hurt doing snow removal and you are not specifically covered for snow removal, you are NOT covered.
You can fill cheap womens stockings with calcium chloride and toss them across the ice dam with limited success.
I would not advocate busting ice with a hammer or other objects that can damage roofs or gutters. If things are that bad then consider investing in an Arctic Steamer americanpressureinc.com/arct ... ution.html
We haven't found a lot of money in snow removal. By the time you factor in buying tools like shovels, roof rakes, salt, etc. Factor in the huge liability and (this is a big one) the percentage of people that will not pay you, it's more a matter of keeping your guys busy in the winter months when work is slow. Your mileage may vary.