Tile with substantially flat structure, notably intended for laying on a roof with a low pitch, comprising an internal surface intended to be laid facing a pitched roof and an external surface opposite to the internal surface, the external surface comprising: - a substantially planar margin intended to direct the received rainwater, - an upper interlock portion situated in the continuation of the margin in a longitudinal direction corresponding to the line of greatest pitch of the roof, the upper interlock portion being configured to be overlapped by a tile that is adjacent in the longitudinal direction, - an external lateral interlock portion situated at a lateral edge of the margin, the external lateral interlock portion being configured to be overlapped by a tile that is adjacent in a transverse direction of the roof, the transverse direction being orthogonal to the longitudinal direction, wherein the external surface comprises an adjustment portion configured to allow adjustment of the overlap between the tile and an identical tile that is adjacent in the longitudinal direction, the adjustment portion being situated between the upper interlock portion and the margin, at least a part of the adjustment portion being configured to be overlapped by the tile that is adjacent in the longitudinal direction, the internal surface comprising a projecting support strip extending in the transverse direction, the support strip being configured to act as a support in a lower portion of the tile and to come into contact with the adjustment portion of the tile that is adjacent in the longitudinal direction, the contact between the support strip and the adjustment portion of the adjacent tile being adjustable in the longitudinal direction so as to modify a dimension of the vertical overlap, and wherein the adjustment portion is inclined in an opposite direction to the pitch of the roof with respect to the margin. the external surface comprising: - a substantially planar margin intended to direct the received rainwater, - an upper interlock portion situated in the continuation of the margin in a longitudinal direction corresponding to the line of greatest pitch of the roof, the upper interlock portion being configured to be overlapped by a tile that is adjacent in the longitudinal direction, - an external lateral interlock portion situated at a lateral edge of the margin, the external lateral interlock portion being configured to be overlapped by a tile that is adjacent in a transverse direction of the roof, the transverse direction being orthogonal to the longitudinal direction, - a substantially planar margin intended to direct the received rainwater, - an upper interlock portion situated in the continuation of the margin in a longitudinal direction corresponding to the line of greatest pitch of the roof, the upper interlock portion being configured to be overlapped by a tile that is adjacent in the longitudinal direction, - an external lateral interlock portion situated at a lateral edge of the margin, the external lateral interlock portion being configured to be overlapped by a tile that is adjacent in a transverse direction of the roof, the transverse direction being orthogonal to the longitudinal direction, wherein the external surface comprises an adjustment portion configured to allow adjustment of the overlap between the tile and an identical tile that is adjacent in the longitudinal direction, the adjustment portion being situated between the upper interlock portion and the margin, at least a part of the adjustment portion being configured to be overlapped by the tile that is adjacent in the longitudinal direction, the internal surface comprising a projecting support strip extending in the transverse direction, the support strip being configured to act as a support in a lower portion of the tile and to come into contact with the adjustment portion of the tile that is adjacent in the longitudinal direction, the contact between the support strip and the adjustment portion of the adjacent tile being adjustable in the longitudinal direction so as to modify a dimension of the vertical overlap, and wherein the adjustment portion is inclined in an opposite direction to the pitch of the roof with respect to the margin.