A polystyrene float is designed for levelling polystyrene boards during thermal insulation and insulation work. The rasp working part is made of galvanised steel sheet with a thickness of 1 mm and large openings that allow effective surface processing. The reinforced working part increases the durability and stability of the tool, while the construction without a backing plate reduces its weight. The ergonomic 3K soft-grip handle ensures a comfortable and secure grip even during intensive use.