What started out as a very poor insulation for a  roof in a cold climate (R 19 batts in a 2×6 rafter bay, largely fallen down in the past 70 years) is being made over as a model of energy saving performance. In this photo you can see the polyisocyanurate nail base beginning to be installed. From the inside 5 1/2″ of polyurethane spray foam will be applied to seal any air leaks and raise the overall R-value to R49! This house is similar to the 1940’s era housing stock we find all over Aspen, Basalt, Carbondale and Glenwood Springs.