m2 Roof consisting of: Corrugated sheet support, optional vapour barrier according to hygrometric calculation and acoustic insulation consisting of asphalt-free polymer-based synthetic sheet with a density of 2,010 Kg/m³, 10.05 Kg/m² and 5 mm thick, TECSOUND 100; Thermal insulation layer in rigid polyisocyanurate (P.I.R) sheets coated on both sides with glass veil, water absorption <2%, water vapour diffusion 25.8 µ, with a thermal conductivity coefficient of 0.028 w/mK, 80 mm thick, type PIR VV 80, to be installed using mechanical fixings; High tenacity non-woven geotextile puncture-resistant separating layer made of heat-sealed polypropylene with a tensile strength of 12.5 kN/M and a static puncture resistance (CBR) of 1500 N with a weight of 170 g/m², TEXXAM 1500; Mechanically fixed synthetic waterproofing membrane, made of 1.8 mm thick FLAGON SR 180 PVC, dimensionally stabilised with polyester mesh felt, resistant to UV rays, atmospheric agents and roots, with a tensile strength ≥ 1100 N/5 cm, elongation at break > 15% and a static puncture resistance > 20 kg, welded by hot air fusion at the overlaps and reinforced in corners and angles with FLAG ANGLES;