After years of dealing with ice dams, I put a new roof on three
years ago, with 6 feet of ice and water shield wrapped over the joint
where the roof meets the fascia. In each of the past two winters, I
still get the ice dams. I know I have poor insulation in the attic.
However, water appears to be getting into the soffit – I get icicles
from the soffit vents and it runs down the side of my house. My roofer
claims he has no idea what’s happening and blames condensation.
I don’t think you have ice dams, unless they are just above the
shield designed to protect the roof under the shield. I think your
problem is the gutters, which sound as if they are overflowing. All
gutters overflow when they ice up, but yours continue to overflow when
all ice and snow is gone. That is because water is dripping or flowing
near the back of the gutter, not down the middle, where it should. If
it flowed too close to the front of the gutter, it will overflow the
front of the gutter, with the resulting flow from the soffit vents and
down the sides of the house. Have a gutter man over to make
adjustments. More insulation on the attic floor and a ridge vent will
prevent ice dams best.