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This roof failed years too early — and the reason is hiding at the ridge and upper slope. It had two different types of attic exhaust: ridge vents and can (box) vents. When you mix ventilation systems like this, the ridge vent often pulls air in through the can vents, instead of pulling it from the soffits. This creates a short-circuited airflow loop, leading to: • Trapped attic heat • Wintertime ice dams • Summer shingle baking • Increased moisture and condensation If your roof has both systems, it’s not ventilating correctly — and your shingles could be deteriorating right now. RoofVentilationFail RidgeVentVsCanVent RoofingMistakes AtticAirflow IceDamPrevention ShingleDamage HomeMaintenanceTips LevelUpImprovement MichiganRoofing MetroDetroitContractors

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