Frost In Attic Rafters

What s happening is that the rafters keep the warm air from migrating much.

Frost in attic rafters.

Water vapor is migrating upward and eventually filtering into the attic. When the moisture gets into the attic it condenses on the roof. 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 you re looking at is evidence of excessive moisture in your house. The worst frost was on the other side though. How much frost should you have in an attic. As seniors with medical conditions we are worried about mould.

Will it cause any harm. Can i cure it. Some of it can cross the first rafter there but it doesn t seem to make it across the second rafter. What causes this type of moisture problem in the attic.

Attic insulation is in the floor of the attic rather than the roof. What causes this frost. The rafters are exposed. 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 outside temperature rises again the frost thaws water collects and can leak into. During winter conditions attic frost is a problem associated with attic bypasses. Our dryer vents up through the attic to the roof. Notice though that there is some migration.

That s about it pretty simple.