Soffit at eaves – insulation? venting?
We are building in climate zone 5. We have a 2/12 roof with a cathedral ceiling. We are planning an unvented roof assembly – flash and batt (closed cell foam (min 41% of total R) on underside of roof deck with BIBS below that).
My question is about the eaves. The roof is basically a simple gable shape with the ridge beam running East/West. Ranch home. The south side of the house is brick and I am concerned about cladding thermal plumes (pic from Building Science Corp) contributing to ice dams.
To minimize the risk for ice dams –
1 – should the soffit be vented or air sealed?
2- should the soffit be insulated?
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