Frost In Attic Rafters

What causes this type of moisture problem in the attic.

Frost in attic rafters.

When the outside temperature rises again the frost thaws water collects and can leak into your house. Near the ridge the frost free area extends over the garage a bit because warm air rises and it ends up near the ridge. How much dripping up there before we have. Our dryer vents up through the attic to the roof.

The frost itself doesn t do any damage but once it melts things get wet which is when the damage. The straight forward answer is that a little frost seen in a canadian attic in the dead of winter is nothing to panic about. Left unchecked frost in an attic can lead to serious mold and decay a patch of frost here and there on the tips of roofing nails poking through the sheathing for instance probably isn t a cause for alarm. Sticking my head into hundreds of attics every year i see lots where.

During winter conditions attic frost is a problem associated with attic bypasses. Some of it can cross the first rafter there but it doesn t seem to make it across the second rafter. The worst frost was on the other side though. 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 weather warms up the frost will become water droplets and evaporate harmlessly.