Attic Ventilation

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Why is Attic Ventilation in The Winter Important?

If you are anything like most people, you probably don’t spend a ton of time in your attic. The attic is an out of sight, out of mind area. That is, until you watch a horror movie where there’s a creepy sound coming from the attic, or until you have to pay for roof repairs due to improper attic ventilation. Attic ventilation is always important, but it’s especially important in the winter.

What happens if my attic doesn’t have proper ventilation?

We are glad you asked. Having ventilation to the outside of your house from your attic may sound like the opposite of what you want in the cold months. But it really is necessary, here’s why:

During the winter, heat rises from your home and goes into the attic. What goes hand in hand with heat? Moisture. If there is no ventilation for the heat to escape, there is just a mass of warm, wet air sitting in your attic. The moisture will begin to settle into your roofing materials, the framing of your roof, and anything that is being stored up there.

Having proper ventilation in your attic will not only allow the warm, moist air to escape, but also allow the cool, dry air in. This evens out the air in the room so that there isn’t hot or cold spots. This is important in preventing ice dams from building up and causing water to freeze underneath your roof’s shingles.

How do I ventilate my attic?

In your attic you should have intake vents and exhaust vents. For every intake there should be an exhaust, a 1:1 ratio.

There are 3 types of intake vents: gable, under-eave, and rafter. Gable vents are at the highest point of the roof’s peak. Under-eave vents are continuous vents that run under the home’s eave. Rafter vents are exactly where it sounds like they would be…along the rafters.

There are 2 types of exhaust vents: ridge and turbine. Ridge vents are along the roof’s ridge, and turbine vents are along or near the roof’s ridge. Turbine vents have a small fan in them that turns with the wind, sucking the hot air from your attic.

The point in venting your attic is to rid it of the warm, wet air that is just sitting up there, waiting to cause problems. Having proper attic ventilation will prevent you from having to deal with problems like mold/mildew in your insulation and having to repair, or even replace your roof! Insulation is key to energy efficiency, and once mold and mildew damage occur you’ve got big problems.

Call Air Expo today to check for proper ventilation and help solve some potentially large problems this spring.

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