Polystyrene insulation offers high resistance to water absorption. Extruded polystyrene (XPS) insulation can be used for floor insulation below the concrete slab and on inverted roofs where its resistance to mechanical damage from foot traffic is advantageous.
EPS, known as expanded polystyrene offers low thermal conductivity. It is lightweight ensuring the easy handling and installation of this insulation. Polystyrene insulation is completely compatible with other materials used in construction such as, cements, plasters and salt.