Frost In Attic During Winter

During winter there are usually three sources of humidity in an attic.

Frost in attic during winter.

When the outside temperature rises again the frost thaws water collects and can leak into your house. 1 a leak 2 air infiltration from the living spaces and 3 incorrect venting of kitchen bathroom washer drier or plumbing vents. The air in the attic has water in it and it condenses on the cold metal. If you have a roof leak in the winter months and it s not being caused by ice dam there may be another culprit.

When the moisture gets into the attic it condenses on the roof. A point often overlooked is that since it s winter the water freezes on the cold nails. This is why you see the frost. This exact same process is happening in your attic during extreme cold weather.

The nails that you see in your attic get as cold as the outdoor temperature. Sealing your attic access hatch to prevent the movement of indoor air past the edges is the first step. 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. During winter conditions attic frost is a problem associated with attic bypasses.

This will freeze if attic temperatures remain below freezing causing frost to build up. Attic condensation the conditions that cause ice dams often cause attic condensation too.