Frost In Attic Rafters

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. We still have one area in the rafters between the bathroom and a walk in closet that has some frost. How much frost should you have in an attic.

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How much dripping up there before we have.

Frost in attic rafters.

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. When the moisture gets into the attic it condenses on the roof. 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.

What causes this frost. Attic insulation is in the floor of the attic rather than the roof. Can i cure it. Water vapor is migrating upward and eventually filtering into the attic.

Our dryer vents up through the attic to the roof. The rafters are exposed. What causes this type of moisture problem in the attic. Near the ridge the frost free area extends over the garage a bit because warm air rises and it ends up near the ridge.

Will it cause any harm. Frost accumulates in attics when moisture laden air from the house gets up there when it s cold. Notice though that there is some migration. The worst frost was on the other side though.

What s happening is that the rafters keep the warm air from migrating much. What you re looking at is evidence of excessive moisture in your house. As seniors with medical conditions we are worried about mould. That s about it pretty simple.

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

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