Professional Insulation Panels are high density and fire retardant treated polystyrene panels. Because the panels are made from extruded polystyrene they achieve much higher density per square inch, which in turn provides higher levels of thermal insulation when compared with other polystyrene materials. Apart from good thermal insulation levels, the Professional Insulation Panels help with combating condensation issues and provide an effective way to hide problem surfaces such as cracked plaster.