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As to the type of surface treatment of the porphyry we can have various types of steps: those having both tread and riser, those with the tread only, or massive steps. The tread can be quarry-face with various thicknesses, or calibrated and with sawn, split, flamed or bull-nose edges; they may have constant thickness (2, 3, 4cm) and flamed, polished or semi polished faces. The riser serves to cover the vertical part of the step. Risers can be of varied or constant thickness. Massive steps consist of single porphyry blocks. The cost of porphyry is compensated for by its unlimited life and by the overall pleasant effect of a paving of this type. The surface can be quarry-face, flamed or sandblasted; while the edges can be split, coarse- or fine-chiselled, hammered, sawn, flamed or sandblasted. |
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