This newly purchased home that had a history of ice damming & high energy costs. Upon inspection, the attic & front knee wall only had 2″ of old insulation. Heat from the living space was escaping into the knee wall area and warming the roof deck which leads to snow melt and severe ice dams. This thermal envelope flaw is very common with Cape styled houses.
To solve the historic problems, Cozy Home Performance installed 2″ of rigid insulation board over rafter slopes in the kneewall and then dense packed the empty rafter cavities with cellulose. This provided total R-value of R38, plus a thermal bread over the rafter framing. The attic was completely air sealed and insulated with 12″ of cellulose for a R-value of R42.