m2 Clean, dry and consolidated substrate prepared to receive waterproofing with ALSAN PUR liquid system (W2 ETA 23/0804 with a minimum useful life of 10 years), consisting of the following elements: ALSAN EPOX 131 epoxy primer with a coverage of 300 - 500 g/m2 applied with a roller; ALSAN PUR 608 liquid-applied single-component polyurethane membrane with a consumption of 1 - 1.2 kg/m2 applied with a roller, reinforcing it with ALSAN VELO P geotextile reinforcement weighing 110 grams with an overlap of 10 - 15 cm; second layer of ALSAN PUR 608 with a consumption of 0.5 - 0.3 kg/m2 and a third layer of ALSAN PUR 608 with a consumption of 0.5 kg/m2 or until reaching a minimum provision of 1.6 kg/m2; For a non-slip finish, sprinkle SILICA FIN sand (1 KG/M2) while the last layer of ALSAN PUR is still wet; Protective layer with ALSAN FT 904 FT aliphatic membrane with a consumption of 200 to 500 g/m2.