A roofing system for a roof comprising a plurality of panels made of a metal sheet and arranged in use adjacent to each other, each with a first longitudinal side thereof connected to an opposite second longitudinal side of the immediately adjacent panel by means of a removable jointing device, in a direction of extension of a pitch of the roof said jointing device comprising the first and the second longitudinal adjacent sides (10,12) of each pair of adjacent panels, at least one bracket coupled to said adjacent longitudinal sides (10,11) and fastening means of the bracket to the roof; wherein said at least one bracket is designed to be supported laterally in cantilever fashion by the fastening means so as to define an undercut which is in use facing towards the pitch, and at least one of said first and second sides (10,11) of each pair of adjacent panels is made so as to be elastically deformable so as to snappingly engage, by means of an engagement portion thereof, said at least one bracket, in at least a plurality of different points (P1, P2,.. Pn) underneath said undercut; said first and second adjacent sides (10,11) of each pair of adjacent panels displaying a mating profile and being reciprocally overlappingly coupled beneath the undercut, at least in correspondence with the snap engagement portion with the bracket; wherein a fastening portion is flat wing-shaped, while a clamping portion has a goose necked complex shape and comprises: a first stretch, immediately adjacent to the fastening portion, folded away a laying plane of the fastening portion so as to display, on a plane which is perpendicular to the first and second sides (10,11) of the panels, a U shape flared towards the fastening portion so as to delimit, towards the same, a cavity which parallelly extends to the said first and second adjacent sides (10,11) of the panels; and a second stretch defined by a flat wing arranged on the side of an inlet opening of said cavity delimited by the first stretch; and wherein said second longitudinal side is delimited by a boxed profile open on the side facing towards the pitch in use, so as to be elastically deformable, and shaped to define a longitudinal housing adapted to contain therein a every bracket cooperating with the same; wherein in combination: - the first longitudinal side of each panel is delimited by an folded edge which is L-shaped on the side opposite to that facing in use the pitch and insertable in use in said cavity delimited by the first stretch of the clamping portion and defining said concavity of the same facing towards the pitch in use; and - said boxed profile of each second longitudinal side being delimited by a terminal edge folded towards the inside of the boxed profile itself by a length so as to couple in use under the second stretch of the clamping portion of the bracket to be gripped between the latter and the first side of the adjacent panel, characterized in that, said terminal edge is aligned and coplanar with the fattening portion of the bracket. - the first longitudinal side of each panel is delimited by an folded edge which is L-shaped on the side opposite to that facing in use the pitch and insertable in use in said cavity delimited by the first stretch of the clamping portion and defining said concavity of the same facing towards the pitch in use; and - said boxed profile of each second longitudinal side being delimited by a terminal edge folded towards the inside of the boxed profile itself by a length so as to couple in use under the second stretch of the clamping portion of the bracket to be gripped between the latter and the first side of the adjacent panel, characterized in that, said terminal edge is aligned and coplanar with the fattening portion of the bracket.