m2 Roof consisting of: formation of slopes with aerated concrete in an average thickness of 8 cms finished in cement mortar with an average thickness of 2 cms with the necessary surface resistance to receive the waterproofing; Bilayer waterproofing membrane BONDED to the substrate after asphalt emulsion EMUFAL PRIMER with a minimum endowment of 300 gr./m2, SBS elastomeric LBM with fiberglass felt (FV) armor with a flexibility at low temperatures ≤-15ºC type MORTERPLAS SBS FV 4 KG (LBM-40-FV according to UNE 104410:2013), upper sheet fully adhered to the lower layer of SBS elastomeric modified bitumen with reinforced and stabilized polyester felt (FP) reinforcement with a flexibility to low temperatures ≤ -15ºC type MORTERPLAS SBS FP 4 kg (LBM-48-FP according to UNE 104410:2013), high tenacity non-woven geotextile separator layer based on thermowelded polypropylene with tensile strength of 9 kN/M and static punch resistance (CBR) of 1500 N according to a grammage of 90 grs/m2 TEXXAM 1000; thermal insulation layer formed by extruded polystyrene sheets with dimensions 1250x600 mm with half-wood joints with compressive strength of 300 KPa, Lambda thermal conductivity 0.036 W/mºK and thickness 80 mm type SOPRA XPS SL 80; high-tenacity non-woven geotextile anti-puncture separator layer based on heat-welded polypropylene with tensile strength of 12.5 kN/M and static punch resistance (CBR) of 2250 N with a weight of 170 grs/m2 TEXXAM 1500, finishing layer by means of reinforced concrete screed with electrowelded mesh for load distribution.