Published 2026-10-20 · Kansas City roofing guide
In short
Cool air enters at the soffits and warm air leaves at the ridge; balance between the two keeps the attic near outdoor temperature.
How it works
Intake vents at the soffits let outside air into the attic. Exhaust vents near the ridge let warm, moist air out. When the two are balanced, air moves steadily under the roof deck.
Signs of poor ventilation
- A very hot attic in summer
- Frost or moisture on the underside of the roof deck in winter
- Ice dams along the eaves
- Shingles curling or aging early
- Musty smell or mold in the attic
Fixing it
Common fixes include clearing blocked soffit vents, adding baffles so insulation does not cover them, and installing a ridge vent. These are best done during a roof replacement, when the deck is exposed.
Questions
Can a roof have too much ventilation?
Mixing vent types, like a ridge vent with gable fans, can short-circuit airflow. Balance matters more than quantity.
Does ventilation affect shingle warranties?
Many shingle warranties require proper ventilation.
