Frost In Attic Rafters

When the outside temperature rises again the frost thaws water collects and can leak into.

Frost in attic rafters.

The rafters are exposed. Frost accumulates in attics when moisture laden air from the house gets up there when it s cold. Some of it can cross the first rafter there but it doesn t seem to make it across the second rafter. That s about it pretty simple.

Water vapor is migrating upward and eventually filtering into the attic. 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 frost should you have in an attic. Our dryer vents up through the attic to the roof.

When the moisture gets into the attic it condenses on the roof. Attic insulation is in the floor of the attic rather than the roof. What s happening is that the rafters keep the warm air from migrating much. Near the ridge the frost free area extends over the garage a bit because warm air rises and it ends up near the ridge.

What you re looking at is evidence of excessive moisture in your house. We still have one area in the rafters between the bathroom and a walk in closet that has some frost. The worst frost was on the other side though. Can i cure it.

Will it cause any harm. A few years ago we had a lot of frost and a company came in and charged us 250 to spray the exhaust fan and duct to stop leakage. How much dripping up there before we have. What causes this frost.

What causes this type of moisture problem in the attic.