Attic Ventilation Myths That are Off the Charts

Few things are more misunderstood about the

home than attic ventilation. In essence, all

ventilation is about circulating air to keep it

fresh and to reduce moisture levels. About 90

percent of homes in the US have unreasonably high

levels of moisture. Understanding whether your home could benefit from some form of attic

ventilation might just be, if not a life-saver, a roof-

saver.

Here are some of the myths and the facts you need to know about attic ventilation.

1. More Attic Ventilation is Good

Insufficient ventilation can lead to moisture problems during the winter and decreased energy efficiency during the summer but too much ventilation can be just as bad, if not worse. Roof vents create an additional roof penetration, essentially another place of vulnerability where leaks can occur

2. Roof Vents are for Warmer Climates

Good roof ventilation can do this, but shingle color, sun exposure and insulation are exponentially more important to overall energy efficiency than ventilation. Sure, installing roof vents for older homes can reduce your hot air during the summer, but there are probably more low-risk, cost-effective ways to increase your home’s energy efficiency.

3. Roof Vents Remove Warm Air during the Winter

Too many people believe that because heat rises, ventilating an attic space during the winter means you’re releasing warm air and creating a drag on your heating efficiency. If this is true, you’ve got bigger problems to worry about than letting warm air escape from your home. Poor insulation is usually the culprit, although if you enter the attic on sunny, winter day, your attic space can be warmed by the sun more than your furnace. When this warm, moist air hits your roof, it’s likely to form condensation that will lead to further deterioration of your insulation and/or wood rot. If you think this might be a concern, wait till the sun goes down and measure the temperature in your attic. It should be pretty close to the outdoor temperature.

4. Research Studies

Numerous studies have been completed regarding the effectiveness and optimization of general roof ventilation and particular types of roof vents. The benefit of roof ventilation is undisputed. Laboratory setting are a poor indicator of real world wind and weather behaviors. In some ways, roof ventilation is as much as an art as it is a science

5. I Have Roof Vents, So I Have Roof Ventilation

While hardly anybody agrees on the best roof ventilation system, everybody agrees some roof vents do hardly any good at all. Take, for example, ridge vents. The majority of roofing experts agree that ridge vents are the most effective and cost-effective roof vents available. A ridge vent may create almost no ventilation at all.If you don’t know how your roof vents work, or if you’re unsure about your attic ventilation in general, you should talk to a roof inspector about your current system and any inherent weaknesses that may be at work

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