Ventilation in the attic is important!

Ventilation in the attic is important!

Protect your home during the winter months

Sufficient air circulation in the winter months is very important. During the winter, proper attic ventilation protects the structure of your roof from damaging moisture problems, helps maintain good indoor air quality, and keeps your energy bill from skyrocketing.

In the winter, heat rises—and with it comes moisture. When an attic isn’t well ventilated, moisture really likes to hang around this area of the home. Moisture can seep into the structure of your home, damaging framing and roofing materials, and even the contents of your attic.

It seems counter intuitive, but you want to keep your attic cool in the winter. Attic ventilation allows cool, dry outside air to enter the attic, and warm, moist air inside air to escape the attic. Good ventilation will help keep temperatures even to prevent hot and cold spots that cause ice dams to form and lead to rot, ceiling stains, damaged shingles, and more.

Proper attic ventilation also prevents mold and mildew growth, safeguarding the quality of indoor air against these harmful contaminants. It also prevents the warm, damp, and dark environment that pests love, keeping rodents and insects from nesting.

To ensure adequate ventilation, one square foot of ventilation is recommended per every 300 cubic feet of space within the attic. A 1:1 ratio of intake and exhaust vents is required for proper airflow. Roof vents allow for natural attic ventilation, but there are also mechanical solutions available.

Intake vents allow air to move into the attic, and exhaust vents allow warm, moist air to move out of the space. While attic ventilation fans work to draw in cool, outside air and force out warm, moist air through the roof vent system. All three solutions work to keep your attic cooler and drier.

In addition to the ventilation solutions above, the following actions will also help you keep your attic cool and avoid any issues:

  • Put a stop to free air flow by sealing all nail penetrations. Pay attention to all electrical, HVAC, and chimney penetrations.
  • Replace damaged roof and ridge vents.
  • Do not cover attic vents during the winter months. Doing so, keeps cold air out and disrupts attic ventilation—leading to moisture issues.
  • Clear the space between the top of insulation and the roof deck’s underside at the eaves. This allows air to move through the rafters.

It may seem a little odd to want a cool space above you, while you’re trying to keep the rest of the home warm and cozy. If you have sufficient attic insulation, a cool attic won’t impact the temperatures in the rest of your home, or cause your heating system to work harder.


If you need help with indoor home comfort solutions, work with trusted, local heating and cooling specialists—we know a few!

Feel free to ask us questions. You can reach the office by calling 250.465.2490. You can also contact us online.

We are always happy to help you find the best home comfort solution—and direct you to other professionals if we don’t fit your needs.

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