Frost In The Attic Information

The fix for frost in the attic is sealing attic bypasses these are passageways from the conditioned household space to the attic.

Frost in the attic information.

When the moisture gets into the attic it condenses on the roof sheathing in the form of frost. Houses with full home humidity systems are at risk for attic frost if the home s level of humidity is excessive. Bypasses are what allow moisture in the attic to begin with and this is what needs repair. Frost shows up in the attic when moisture laden air from the house gets into the attic.

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. Full home humidity systems. During winter conditions attic frost is a problem associated with attic bypasses. Lack of attic air sealing also allows frost to form as warm air penetrating into the attic causes moisture to condense on chilly surfaces.

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. I ve blogged about attic air leaks many times and i ve shared photos of attic air leaks. That s about it pretty simple. That s about it pretty simple.

To start frost accumulates when moisture laden air from the house gets into the attic. I have a 1000sqft attic floor area with two 301 maximum static roof vents. Cold weather climate winter lows of 25c. The frost itself doesn t do.

When the outside temperature rises again the frost thaws water collects and can leak into. Frost gets into the attic from air leaks or attic bypasses. This post is largely a re blog of my last post on attic frost but that was from 2013 and it s time for a reminder about all of this. Inadequate attic air sealing.