I built my house in 2001-02, a 3 bedroom 2.5 bath cape. It has a full shed dormer in the back with 2 a dormers on the main in the front, never had any problems with ice dams and have never gotten up there and shoveled snow at all. Course it has 2x12 rafters on the front roof and 2x8 on the rear dormer with 5/8 plywood on the whole thing.
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