What causes this frost.
Frost in attic rafters.
Our dryer vents up through the attic to the roof.
Can i cure it.
As seniors with medical conditions we are worried about mould.
The worst frost was on the other side though.
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.
Some of it can cross the first rafter there but it doesn t seem to make it across the second rafter.
Frost accumulates in attics when moisture laden air from the house gets up there when it s cold.
How much dripping up there before we have.
How much frost should you have in an attic.
What s happening is that the rafters keep the warm air from migrating much.
What causes this type of moisture problem in the attic.
During winter conditions attic frost is a problem associated with attic bypasses.
The rafters are exposed.
When the outside temperature rises again the frost thaws water collects and can leak into.
Near the ridge the frost free area extends over the garage a bit because warm air rises and it ends up near the ridge.
Water vapor is migrating upward and eventually filtering into the attic.
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 you re looking at is evidence of excessive moisture in your house.
Will it cause any harm.
Notice though that there is some migration.