The Hidden System Protecting Your Roof
Cool air enters through soffit vents, warm moist air exits through ridge vents. This keeps your attic close to outdoor temperature and removes moisture. Standard: 1 sq ft of ventilation per 150 sq ft of attic floor.
What Happens Without It
Winter: Ice Dams
Attic heat melts snow on upper roof, water flows down and refreezes at eaves, forming ice dams. Water backs up under shingles and leaks inside. Almost entirely preventable with proper ventilation.
Summer: Heat Buildup
Unventilated attic in July: 160°F. This bakes shingles from below (voiding warranties), overworks your AC, and warps decking. Proper ventilation reduces attic temps by 30-40°F.
Year-Round: Mold
An average family generates 2-4 gallons of water vapor daily. Without ventilation, moisture condenses in the attic causing mold. Remediation costs $1,500-$5,000+.
Signs of Inadequate Ventilation
- Ice dams forming in winter
- Extremely hot upstairs rooms in summer
- Peeling exterior paint
- Mold or rust in the attic
- Shingles aging faster than expected
Best System
Continuous ridge vent + full soffit intake = balanced passive airflow. Ridge vent installation costs $400-$800 for an average home. One of the highest-return improvements for roof longevity.
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