Thermal insulation layer consisting of extruded polystyrene sheets measuring 1250x600 mm with tongue and groove joints with compressive strength of 250 KPa, thermal conductivity Lambda 0.036 W/mºK according to EN 13164 and thickness 80 mm type EFYOS XPS PM 80; Drainage layer of low density polyethylene (HDPE) with polypropylene geotextile bonded 500 gr/m², 7.5 mm thick and compressive strength >150 kPa type DRENTEX PROTECT PLUS mechanically anchored with DRENTEX FIXINGS and starting profile type DRENTEX PROFIL to prevent the system from slipping during soil compaction, placing the geotextile in contact with the ground.