This is the best ventallation combination there is. It allows cold are to enter along the soffets and exit at the ridge (where most of the heat is). An ideal attic would be less than 32 degrees all the time in the winter. Ice dams are caused by the attic temperature rising above 32 degrees and the snow on the roof melts. This water runs down the roof until it hits the soffet which is below 32 degrees. As soon as this water hits the cold soffet it refreezes. You really want the attic as cold as possible. The insulation on the ceiling of the living area is what keeps the cold air in the attic and not get into the house. The vapor barrier should NEVER be cut. This allows moister to get into your attic, condense, and fall back into the insulation. Once the insulation gets wet, you are going to have MAJOR problems.
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