Ice dams are created by rising heat escaping the home and melting the snow on the roof. The melted snow runs down the roof and refreezes at the eave line where it is colder. This creates a dam for water to pool. This pool of water can work its way under the shingles and into the home causing considerable damage. Sealing and insulating your attic plus having proper roof venting will keep the heat from escaping your home. Not only will this help prevent ice dams it will also help reduce your heating and cooling bills.
The Hutchinson HRA have grant and loan programs to help you afford these home improvements! Contact Judy at (320) 234-4451 for more details.
HouseLogic.com has more information on Ice Dams at this link https://www.houselogic.com/organize-maintain/home-maintenance-tips/preventing-ice-dams/