Insulation of the River House began today. We are using closed-cell foam throughout. Inch for inch it has the highest R-value of any insulation on the market today. In addition, it forms a continuous air and vapor barrier, does not settle over time, and increases the shear strength of the framing by 300%. The walls will get 5 inches (R-32.5 in addition to the R6 ZIP sheathing), and the roof will get 10 inches (R-65). The only down side to closed cell foam is that once it cures there is no modifying anything encapsulated by it.