Condensation is caused when warm air comes into contact with a cold surface. When the air in contact with the surface cools, it is no longer able to contain the moisture present in the air and this moisture will condense onto the surface as water droplets. In most cases, these water droplets will virtuallt ‘rain’ down from the underside of the surface. Spray applied polyurethane foam is the most effective method for condensation control. The seamless nature of the foam and the adhesion to the substrate combine to eliminate the possibility of moist air coming in contact with a cold surface. This method is equally effective for condensation on the underside of a tin roof as well as the underside of concrete slabs when coolrooms are built on areas where the slab is suspended.