Insulating panel with studs made of aintered expanded polystyrene with graphite, produced in conformity with UNI EN 13163, with closed-cell structure. This panel is combined with a HIPS thermoformed film, thickness 0.6 mm, in order to improve its resistance to the deformation of the walking surface in compliance with EN 1264. Thermal conductivity 0.030 W/(m·K), insulating thickness 10 mm, total thickness 32 mm, equivalent total thickness 15 mm, thermal resistance 0.50 (m²·K)/W according to UNI EN 13163. Compressive strength according to EN 826 is 150 kPa. These panels have a tongue along the perimeter to connect them for proper combination. They have a moulded surface with studs of 22 mm so that the pipe mm can be fitted into the tabs of the panel at spacing of 5 cm or multiples.