My Attic Has Frost

That s about it pretty simple.

My attic has frost.

Since our minnesota winters are usually dry the only other source of humid air is your living space. It can lead to mold wet insulation and find a way back into the home resulting in water stains on the ceiling. See the picture above. A bathroom vent has been left to pump warm air into the attic.

Many people s first instinct when they notice frost in the attic is to add insulation. If it s due to air infiltration from the living space then air sealing should be the first thing you do not the last. When the moisture gets into the attic it condenses on the roof. The exhaust from the rooms below gets released into the open air in the attic if not sealed properly causing lots of moisture in the air.

Frost in your attic space is a sign that warm humid air is somehow getting into your attic space. To start frost shows up in the attic when moisture laden air from the house gets into the attic. What ends up as frost in the attic starts as water somewhere else in the house. Insulation is irrelevant when your attic bypasses are left open for warm air to pour into the attic.

When warm air from inside the house escapes traveling up through the bypasses the moisture condenses on the roof boards and rafters where the frost can form. Where the water comes from. Left unchecked moisture in the attic can lead to serious mold and decay expensive to repair and potentially unhealthy for anyone in the house. Attic frost is the result of conditioned air leaking out of your home in the winter.

That is not a solution.