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In addition, a vapor barrier should be installed on the side of the insulation that remains warm in winter, especially if the outdoor temperatures average 40 degrees Fahrenheit or below in the coldest winter months and the relative humidity within the house is a constant 50 percent.
Outside, on the roof surface, something else is happening, especially during the winter. The warm air that is escaping through the roof decking from the attic melts the snow on the roof, which trickles down to the frozen gutter and refreezes. Continue reading →