Roofing solutions in North Dakota must be able to do more than just keep water out. As the weather ranges from summer heat to some of the coldest winters in the continental United States, a roofing system that is able to both is worth much more than one that can only do surface protection. What Flat Roof Foam Coating Actually Does Spray polyurethane foam, also known as SPF, is a liquid material that is sprayed on the roof surface and expands and hardens into a continuous lay