Frost In The Attic Information

Check out my post on moldy attics for some.

Frost in the attic information.

When moisture gets into the attic it condenses on the roof sheathing in the form of frost. That s about it pretty simple. Frost gets into the attic from air leaks or attic bypasses. When the outside temperature rises again the frost thaws water collects and can leak into.

While bypasses are certainly the most common cause of frost there are other ways it can happen and these are much more. The fix for frost in the attic is sealing attic bypasses these are passageways from the conditioned household space to the attic. During winter conditions attic frost is a problem associated with attic bypasses. I have a 1000sqft attic floor area with two 301 maximum static roof vents.

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. When the moisture gets into the attic it condenses on the roof sheathing in the form of frost. Bypasses are what allow moisture in the attic to begin with and this is what needs repair.

Houses with full home humidity systems are at risk for attic frost if the home s level of humidity is excessive. I noticed that i have frost in my attic in the winter and that one of my 2 roof vents is forming condensation which is dripping onto the insulation. Inadequate attic air sealing. That s about it pretty simple.

Lack of attic air sealing also allows frost to form as warm air penetrating into the attic causes moisture to condense on chilly surfaces. To start frost accumulates when moisture laden air from the house gets into the attic. Cold weather climate winter lows of 25c. Full home humidity systems.