Attic ventilation is a must in the Midwest. Warm, moist air that escapes from the actual living space in your home can condense on the underside of roof sheathing, leading to rot or mold. Ice dams begin to form when warm attic air melts the snow from beneath and creates runoff that refreezes on the colder eave. Warm air that escapes your living space also carries moisture that will condense on rafters or roof sheathing. If you notice dampness or frost in your attic during winter months, you need better ventilation.
Soffit vents are an excellent way to increase airflow. Outside air enters the attic at the roof’s lowest point creating a more constant and upward circulation of air. It is important to check that insulation is not blocking the soffit vents. Adding a simple ventilation baffle will help ensure that the vents remain open by forming channels that hold insulation at bay and direct incoming air upward.
Roof vents also help to prevent moisture damage in colder climates. Place roof vents near the roof’s peak for optimal results.
Bathroom vent fans must be vented to the outside. If vented into your attic, the excess moisture will cause condensation on the roof members, insulation and eventually lead to mold.