Frost In Attic Rafters

What causes this type of moisture problem in the attic. Will it cause any harm. What s happening is that the rafters keep the warm air from migrating much.

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

Frost in attic rafters.

Notice though that there is some migration. As seniors with medical conditions we are worried about mould. Water vapor is migrating upward and eventually filtering into the attic. Some of it can cross the first rafter there but it doesn t seem to make it across the second rafter.

What you re looking at is evidence of excessive moisture in your house. 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. Attic insulation is in the floor of the attic rather than the roof. What causes this frost.

The rafters are exposed. 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. Our dryer vents up through the attic to the roof.

How much frost should you have in an attic. How much dripping up there before we have. 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. The worst frost was on the other side though.

We still have one area in the rafters between the bathroom and a walk in closet that has some frost. Near the ridge the frost free area extends over the garage a bit because warm air rises and it ends up near the ridge. Can i cure it. Frost accumulates in attics when moisture laden air from the house gets up there when it s cold.

That s about it pretty simple.

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