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Roofing Knowledge Base Roof Express · Bay Area

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Roof Ventilation: Why Attics Overheat (and How to Fix It)

A Wikipedia-style guide to roof ventilation: intake vs exhaust, common vent types, and performance benefits.

Why ventilation matters

Balanced ventilation helps reduce heat/moisture buildup, supports shingle longevity, and can lower cooling load.

Intake vs exhaust

Intake (soffit) brings air in; exhaust (ridge/roof vents) lets hot air out. Balance is key.

Common vent types

Ridge vents, box vents, turbine vents, gable vents, and powered fans.

Symptoms of poor ventilation

Hot attic, moisture, mold, ice damming (colder climates), premature shingle aging.

What to do

An inspection can measure intake/exhaust balance and recommend upgrades.

FAQ

Quick answers to the most common questions.

Does more ventilation always help? +
Not if it’s unbalanced. Too much exhaust with not enough intake can pull air from conditioned spaces.
Will ventilation fix leaks? +
Ventilation helps moisture control but won’t fix roof leaks caused by flashing or membrane issues.

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