SPFI is not only recognized as a thermal insulation, with the National Standards being referenced right in the Building Code but also SPF meets the requirements for a air barrier material and a air barrier system. SPF, in some cases can provide the Code required vapour barrier. SPF can provide thermal insulation, air barrier system, vapour barrier and drainage plane all in one application when used in cavity wall construction. SPF has one of the highest R-Values per inch of any insulating material available.