SPF Roofing Systems provide many benefits to building owners. The two most prominent benefits are waterproofing/ leak prevention and insulation value. Many additional benefits also exist. SPF creates a leak free monolithic seal over your entire roof deck providing a protective roof shell. Sprayed Polyurethane Foam is applied as a liquid using plural- component spray equipment to fill cracks and crevices, it then expands approximately 30 times its original liquid volume to form a hard, closed cell monolithic roof surface.