Over that third unit from the left there s little heat getting into the attic as evidenced by the unmelted snow.
Frost heaters in attics.
That s about it pretty simple.
To start frost shows up in the attic when moisture laden air from the house gets into the attic.
I ve blogged about attic air leaks many times and i ve shared photos of attic air leaks.
In cold climates that leads to ice dams.
During winter conditions attic frost is a problem associated with attic bypasses.
Why it s there and how to fix it by reuben saltzman in study guide energy frost in attics new on january 9 2018 if you have a problem with frost in your attic you re not alone.
When a warm sunny day arrives after a long cold stretch and it seems like you have a roof leak when there isn t a cloud in the sky it s probably attic icing otherwise known as ice dams or ice damming and the surprising thing is that it s very unlikely that the roof covering itself is the problem.
When the outside temperature rises again the frost thaws water collects and can leak into your house.
Frosty roof deck nails and sidewall.
Check out my post on moldy attics for some.
Frost and ice forms in attics when warm humid air accumulates and condenses on the underside of your roof sheathing.
When the moisture gets into the attic it condenses on the roof.
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.
Frost gets into the attic from air leaks or attic bypasses.