Frost In The Attic Information

Houses with full home humidity systems are at risk for attic frost if the home s level of humidity is excessive.

Frost in the attic information.

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. 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 have a 1000sqft attic floor area with two 301 maximum static roof vents. When the moisture gets into the attic it condenses on the roof sheathing in the form of frost.

When the outside temperature rises again the frost thaws water collects and can leak into. 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. That s about it pretty simple. During winter conditions attic frost is a problem associated with attic bypasses.

I ve blogged about attic air leaks many times and i ve shared photos of attic air leaks. 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. Inadequate attic air sealing.

When moisture gets into the attic it condenses on the roof sheathing in the form of frost. Frost gets into the attic from air leaks or attic bypasses. Cold weather climate winter lows of 25c. The frost itself doesn t do.

Check out my post on moldy attics for some. While bypasses are certainly the most common cause of frost there are other ways it can happen and these are much more. Full home humidity systems. Lack of attic air sealing also allows frost to form as warm air penetrating into the attic causes moisture to condense on chilly surfaces.