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Fig. 104 - Section of tile paving. Setting techniques: tiles and flagstone for paving The setting of tiles and flagstone usually follows three separate phases: foundation preparation, setting bed and grouting (Fig. 104). In some cases, tiles and giant flagstone can be set on sand.

Fig. 105 - Setting bed preparation for tile paving. Fig. 106 - Tile installation in setting bedding. Foundation With tiles and flagstone too, the foundation can be ballast ("Macadam", "crush and run") or concrete slab as for cubetti. For the ballast, a layer of compacted gravel is prepared, with an upper surface of smaller-graded gravel for better compactness (Fig. 105 and 106). In the case of a concrete slabe foundation, a 10-15 cm layer of concrete is mixed with 250 kg of cement per each cubic metre of suitably graded inert material, slightly reinforced against shrinkage. In some cases, these two types of foundation can be combined and the related thicknesses varied according to requirements. Setting Bed The bedding layer differs according to whether the stone paving has variable or constant thickness. The most commonly used setting bed

Table 18 - Total paving thickness based on the tile thickness.