To get the most R-value with the least thickness, use batt insulation with higher R-value per inch in combination with rigid foam insulation. Rigid foam sheeting has an R-value ranging from R-5 to ...

ACH Foam Technologies' Foam-Control MAX graphite polystyrene (GPS) is a rigid foam insulation well ... Developed to achieve R5 (R-value) at 1 1/16th in. thick without decrease in R-value ...

Aluminum fascia caps all this nicely. The other issue is insulation levels. Two inches of rigid foam has an R value of only about 10, which is not enough to code for new buildings. It works in ...