Frost In Attic Rafters

What causes this type of moisture problem in the attic.

Frost in attic rafters.

When the moisture gets into the attic it condenses on the roof sheathing in the form of frost. 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. How much dripping up there before we have. The straight forward answer is that a little frost seen in a canadian attic in the dead of winter is nothing to panic about.

What s happening is that the rafters keep the warm air from migrating much. Some of it can cross the first rafter there but it doesn t seem to make it across the second rafter. Our dryer vents up through the attic to the roof. Near the ridge the frost free area extends over the garage a bit because warm air rises and it ends up near the ridge.

During winter conditions attic frost is a problem associated with attic bypasses. When the outside temperature rises again the frost thaws water collects and can leak into your house. The frost itself doesn t do any damage but once it melts things get wet which is when the damage. Notice though that there is some migration.

Sticking my head into hundreds of attics every year i see lots where.