Jabfloor is a floor insulation board that achieves the required U-value and compressive performance on a range of different floor applications:

Jablite Polystyrene EPS 70 Floor Insulation can be used in a wide variety of floor, wall and attic applications both domestic and industrial to satisfy the current building regulations and U-value requirements. Jablite EPS is a lightweight cellular plastic material suitable for a wide range of building-insulation applications. It is an excellent insulating medium which exhibits consistent thermal performance over the range of temperatures normally encountered in buildings. The most common applications are below a concrete slab with concrete poured on top or also being used as a walkway board with chipboard laminated to the EPS 70.