What is the ultimate spare-no-expense solution to ice dams? After several years of roof raking and ice dam chipping I’m ready to bite the bullet and fix it correctly.
My house does not have soffits. The rafters just end at the sidewall, so soffit vents are out. I have ridge and gable vents, but w/o the soffit vents there's not much airflow. The ceiling joists are 2x6's so there's not much depth for insulation.
I was thinking about spray foam insulation on both the attic floor and against the roof. Would that cause ventilation problems? I used it on an addition that has a cathedral ceiling and have not had a problem with it in the 8 years since it was built.