m2 Floating waterproofing membrane using PVC-P FLAGON BSL 200 synthetic sheet with a thickness of 2 mm, reinforced by co-extrusion and highly resistant to attack by microorganisms and root perforation, with a tensile strength >/= of 14 N/mm² (EN 12311-2), elongation at break > 280% (EN 12311-2) and a resistance to static punching > 20 kg (EN 12730) welded by hot air thermofusion in the overlaps and reinforced in corners and corners with FLAG ANGLES; Thermal insulation layer made up of extruded polystyrene sheets with dimensions 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; Low-density polyethylene (HDPE) drainage layer with adhered polypropylene geotextile of 500 gr/m², 7.5 mm thickness and compressive strength >150 kPa type DRENTEX PROTECT PLUS mechanically anchored with DRENTEX FIXINGS and DRENTEX PROFILE type starter profile to prevent the system from slipping during earth matching, placing the geotextile in contact with the ground.