When the moisture gets into the attic it condenses on the roof sheathing in the form of frost.
Frost on roof in attic.
Left unchecked frost in an attic can lead to serious mold and decay.
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.
When the weather warms up the frost will become water droplets and evaporate harmlessly.
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.
Exhaust them with turbine vents.
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.
Frost and ice forms in attics when warm humid air accumulates and condenses on the underside of your roof sheathing.
About california ventilation building codes.
A well ventilated home is drier healthier and more comfortable.
The frost itself doesn t do any damage but once it melts things get wet which is when the damage.
Depending on the temperature and the insolation ie.
Well placed windows doors and other openings allow air to circulate without creating.