During winter conditions attic frost is a problem associated with attic bypasses.
Frost in attic north side.
There was also frost on the west wall on the north side of the dormer where the sun doesn t get to it this time of year.
Upon inspection of the attic the entire north face of the attic had frost on the nails poking through and most of the decking boards.
You can t fully eliminate that moisture but you can try to limit it.
We still have one area in the rafters between the bathroom and a walk in closet that has some frost.
When the moisture gets into the attic it condenses on the roof.
As seniors with medical conditions we are worried about mould.
In most cases rolled or batt insulation will have a vapor barrier already attached.
As to the frost there are a few things you can check.
In some cases frost will form on the northside of the attic sheathing and not the south.
That s about it pretty simple.
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.
During the day as the sun is out in certain circumstances it will produce enough heat to warm the south side and allow it to thaw and evaporate moisture but the north side will still have frost as it does not get warm enough to cause evaporation.
Obviously the frost is caused by moisture in the attic air.
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.
To start frost shows up in the attic when moisture laden air from the house gets into the attic.
If you re further baffled by frost forming on one side and not the others you re probably looking at the north side.
If left untreated it can damage critical structural elements of the home such as the trusses and rafters ruin insulation damage any stored belongings and lead to the formation of potentially toxic black mold.
You can prevent these problems from occurring by maintaining a dry attic with a low relative.
When the outside temperature rises again the frost thaws water collects and can leak into your house.
There is no snow on the roof.
The frost is on the north side since the south side receives more sunlight over the course of the day during winter in the northern hemisphere.
On the vapor barrier the insulation should be labeled at least an r 30.
Condensation in the attic is a serious problem that must be addressed by homeowners.
