m2 Moisture cutting, by means of the gravel drainage system, the application of a single-layer waterproofing membrane adhered to the poor concrete layer with bituminous primer type EA EMUFAL PRIMER with an endowment of 250 g/m3, consisting of a 4.8 kg SBS elastomeric bitumen sheet, with polyester felt reinforcement (FP) type MORTERPLAS SBS FP 4.8 KG placed, ready for protection with the high-tenacity non-woven geotextile anti-puncture separator layer based on heat-welded polypropylene with tensile strength of 9 kN/m according to UNE EN ISO 10319 and static punch resistance (CBR) of 1500 N according to UNE EN ISO 12236 with a grammage of 120 grs/m2 TEXXAM 1000; Thermal insulation layer made up of extruded polystyrene sheets with half-wood joints with compressive strength of 300 KPa, Lambda thermal conductivity 0.036 W/mºK and 80 mm thick SOPRAXPS SL 80 type; High tenacity non-woven geotextile anti-puncture separator layer based on heat-welded polypropylene with tensile strength of 12.5 kN/M according to UNE EN ISO 10319 and static punch resistance (CBR) of 2250 N according to UNE EN ISO 12236 with a grammage of 170 grs/m2 TEXXAM 1500 ready to receive the concreting of the slab.