Spray polyurethane foam (SPF) is a spray-applied plastic that can form a continuous insulation and air sealing barrier on walls, roofs, around corners and other surfaces. SPF insulation is known to resist heat transfer extremely well and offers a highly effective solution in reducing unwanted air infiltration. Spray foam insulation can be applied to many different types of surfaces from concrete, brick, metal, wood, and plastic. So if you need a metal building insulated, new construction house, or even some type of storage container Modern Insulation can insulate it for you.