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Don't Believe These Popular Attic Ventilation Myths

March 6, 2015 | Blog

In Coastal Bend’s humid climate, your ventilation system is an invaluable tool for keeping your home and attic in good condition. Debunking the most common attic ventilation myths can help you make wise decisions about how to provide this area with optimal airflow.

Myth: Attics are built with carefully planned ventilation systems.

Fact: Many attics are built with haphazard systems that provide little airflow. The presence of attic baffles isn’t always a sign of good design because these additions are often unnecessary.

Myth: Powered fans can help attic airflow.

Fact: Electrically powered ventilators can do more harm than good by sucking air and moisture from your rooms into your attic. They’re also a common source of air and water leakage from the outdoors. If they’re used, your attic should be thoroughly air sealed.

Myth: You can’t have too much attic ventilation.

Fact: More vents mean more risk of air and water leaks. Too many vents can also increase the risk of roof damage caused by high winds. One sq. ft. of ventilation is often enough for between 150 to 300 sq. feet. of ceiling space.  In many humid climates along the coast too much attic ventilation can bring in very moist air that can cause duct and equipment sweating problems.

Myth: Attic ventilation sucks warm air from your home during the winter.

Fact: As long as your attic is properly air sealed and insulated, very little warm air from your rooms below will enter your attic. Instead, wintertime ventilation does the critical job of removing moisture that might otherwise encourage rot and mold growth.

Myth: Research has determined optimal ventilation designs for every type of attic.

Fact: This attic ventilation myth may sound logical, but it doesn’t work out in practice. While there are some known best practices, there are so many variations from one attic to another that a ventilation system can’t always be designed by the book. This is why the job is best left to an experienced professional.

For more help separating attic ventilation myths from the facts or for help upgrading your ventilation system, contact CCAC in Corpus Christi and elsewhere around South Texas.

Our goal is to help educate our customers in Corpus Christi, Texas about energy and home comfort issues (specific to HVAC systems). For more information about attic ventilation and other HVAC topics, download our free Home Comfort Resource guide.

Credit/Copyright Attribution: “attem/Shutterstock”

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