we put blow in insulation between the second floor ceiling and attic floor in the fall of 2007.(The house has a flat deck)It worked wellNo ice formed on the roof during that last winterThis winter began, and in one area of the flat roof ice formedThis seems to indicate to me that heat from the attic was getting thru the insulation and causing the roof bottom to melt the snow that fell on itThat is what I wanted to avoid because ice formation on a flat deck damages a roofDoes anyone know why ice would form now after last year there was no ice formation ever?
