Summary
Proper attic ventilation helps protect a home from heat, moisture, mold, roof damage, and higher energy costs. Bob Vila explains that effective systems use intake vents, such as soffit or gable vents, alongside exhaust vents, including ridge, static, turbine, or powered vents. The International Residential Code generally recommends one square foot of ventilation for every 300 square feet of attic floor, though local requirements may differ. Homeowners should regularly inspect and clean vents, maintain balanced intake and exhaust airflow, and prevent insulation from blocking openings. Signs of poor ventilation include excessive attic heat, moisture, ice dams, roof deterioration, and increased cooling costs.
Bob Vila

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