Frost In Attic Rafters

The rafters are exposed.

Frost in attic rafters.

Notice though that there is some migration. Our dryer vents up through the attic to the roof. 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. Can i cure it.

How much frost should you have in an attic. Frost accumulates in attics when moisture laden air from the house gets up there when it s cold. What causes this type of moisture problem in the attic. 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.

As seniors with medical conditions we are worried about mould. When the moisture gets into the attic it condenses on the roof. Will it cause any harm. When the outside temperature rises again the frost thaws water collects and can leak into.

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. Some of it can cross the first rafter there but it doesn t seem to make it across the second rafter. Water vapor is migrating upward and eventually filtering into the attic.

How much dripping up there before we have. The worst frost was on the other side though. What you re looking at is evidence of excessive moisture in 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.

That s about it pretty simple.