SPF or spray polyurethane foam describes a category of high-performance spray foam insulation and air barrier material that delivers multiple benefits in one application. These advantages include high insulation values, near-zero air permeability, increased building strength, severe weather and flood resistance, increased occupant comfort, improved indoor air quality, reduced operating costs and lower environmental impacts. Because spray foam is fully adhering and seals hard-to-reach penetrations, it provides unequaled air sealing properties for the entire building envelope.