Frost In Attic Rafters

During winter conditions attic frost is a problem associated with attic bypasses.

Frost in attic rafters.

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. When the outside temperature rises again the frost thaws water collects and can leak into your house. The straight forward answer is that a little frost seen in a canadian attic in the dead of winter is nothing to panic about. When the moisture gets into the attic it condenses on the roof sheathing in the form of frost.

What s happening is that the rafters keep the warm air from migrating much. Notice though that there is some migration. How much dripping up there before we have. When the weather warms up the frost will become water droplets and evaporate harmlessly.

Near the ridge the frost free area extends over the garage a bit because warm air rises and it ends up near the ridge. Our dryer vents up through the attic to the roof. The worst frost was on the other side though. Sticking my head into hundreds of attics every year i see lots where.

The frost itself doesn t do any damage but once it melts things get wet which is when the damage.