Method for producing facades, roofs or floors by means of fire-resistant self-supporting panels (1, 10), consisting of: - providing one or more modules (2, 11, 12) comprising: o a U-shaped metal profile comprising a horizontal central area extending in the longitudinal direction of the profile, two substantially vertical lateral webs (6, 6') comprising insertion ribs (20", 21") extending each side of the central area and two substantially horizontal sole plates (7, 7') extending each of the lateral webs, said profile optionally being provided with a corrosion-protection coating, o a substantially horizontal metal reinforcing element extending between the webs (6, 6') of the profile, secured to said metal profile, o a thermally insulating layer disposed in abutment on said central area between said webs (6, 6') and under said metal reinforcing element, said thermal insulator consisting of rock wool and having, at the two ends thereof, a thickness less than the height of said metal profile, - pouring, in the factory, a layer of concrete covering the entire surface of said thermally insulating layer and entirely surrounding said metal reinforcing element or elements, said layer of concrete being in contact with said webs of said metal profile, so as to form a fire-resisting self-supporting panel (1, 10), - conveying said panels on site, - assembling said panels by means of the insertion ribs (20", 21"). - providing one or more modules (2, 11, 12) comprising: o a U-shaped metal profile comprising a horizontal central area extending in the longitudinal direction of the profile, two substantially vertical lateral webs (6, 6') comprising insertion ribs (20", 21") extending each side of the central area and two substantially horizontal sole plates (7, 7') extending each of the lateral webs, said profile optionally being provided with a corrosion-protection coating, o a substantially horizontal metal reinforcing element extending between the webs (6, 6') of the profile, secured to said metal profile, o a thermally insulating layer disposed in abutment on said central area between said webs (6, 6') and under said metal reinforcing element, said thermal insulator consisting of rock wool and having, at the two ends thereof, a thickness less than the height of said metal profile, o a U-shaped metal profile comprising a horizontal central area extending in the longitudinal direction of the profile, two substantially vertical lateral webs (6, 6') comprising insertion ribs (20", 21") extending each side of the central area and two substantially horizontal sole plates (7, 7') extending each of the lateral webs, said profile optionally being provided with a corrosion-protection coating, o a substantially horizontal metal reinforcing element extending between the webs (6, 6') of the profile, secured to said metal profile, o a thermally insulating layer disposed in abutment on said central area between said webs (6, 6') and under said metal reinforcing element, said thermal insulator consisting of rock wool and having, at the two ends thereof, a thickness less than the height of said metal profile, - pouring, in the factory, a layer of concrete covering the entire surface of said thermally insulating layer and entirely surrounding said metal reinforcing element or elements, said layer of concrete being in contact with said webs of said metal profile, so as to form a fire-resisting self-supporting panel (1, 10), - conveying said panels on site, - assembling said panels by means of the insertion ribs (20", 21").