A reinforced concrete tile is provided with substantially increased tensile strength and lightness in weight by a lightweight substrate layer of reinforced resinous material which has been applied while wet to the lower surface of layer of concrete so as to integrally bond itself to the layer of concrete. The substrate layer may comprise a resinous mixture reinforced with fibres or with a mesh of fibreglass or other appropriate composition. In a first method of making reinforced concrete tiles, a concrete tile which has been formed has the bottom surface thereof treated so as to roughen the surface and remove any loose debris therefrom. A layer of reinforced resinous material is then applied to the bottom surface of the concrete tile. In a second method of making a reinforced concrete tile, wet concrete is extruded onto a pallet having an upper surface, which may be formed by a liner of appropriate configuration to impart a wood shingle appearance, and which defines the top surface of a tile to be formed. After shaping the wet concrete tile on the pallet, a layer of reinforced resinous material is applied to the surface of the wet concrete tile opposite the pallet, so as to form a reinforced substrate layer on the base of the concrete tile being formed, before curing and removing the tile. The layer of reinforced resinous material may be applied by application of layers of resinous slurry before and after application of a layer of mesh, or by pressing the mesh onto a layer of slurry using a roller. The layer of mesh can be offset to form the base of a moulded sidelock portion of the tile and to help secure the tile to an underlying roof structure. In accordance with still further methods, reinforced tiles are formed by disposing a layer of mesh between concrete layers of different thickness and by placing a layer of mesh on the upstanding pegs of a pallet and forming the concrete tile thereover.