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JLC • DECEMBER 1996 JLC • DECEMBER 1996/0 As a builder in the Northeast, where cold, snow, and ice are the main course on the winter menu, roof ventilation is one of my top concerns. The primary reason is that without good ventilation, most roofs in snowy climates will suffer from destructive ice dams. I've chipped away at my share of ice dams, and in my experience the cause is always the same: Hot air is all dressed up and has no place to go. Every house ever built has heat loss through the roof. When air in a rafter bay is warmed, it's natural for it to rise. If it can't escape, it's going