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Attic ventilation
Attic ventilation is the controlled airflow that moves fresh air into the attic and exhausts warm moist air out.
Why it matters
It helps prevent moisture damage, reduces heat buildup, and lowers ice dam risk.
Where people get this wrong
Ventilation is not a fix for big air leaks from the house into the attic. More vents is not always better. Balance intake and exhaust.
Real-world example
In winter, the attic smells musty and nails show rust. That can mean moist house air is leaking into the attic and ventilation is not clearing it.
Where this hits your build
This affects comfort, energy costs, and indoor air quality. It gets locked behind drywall, so decisions here need to be right before finishing starts.
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