Why does moisture form in attics? There are two main causes of attic moisture: outdoor air humidity in the fall and indoor living space air humidity throughout the fall and winter. For the sake of this conversation, we are looking at a standard flat interior living space ceiling with a sloped trussed attic roof. First, moisture in the attic can be caused from outdoor air humidity. In the fall, lots of rain in September and October creates high humidity in Read More …





