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Porphyry stairs can have a natural cleft or a machined surface. For the treads the thickness can be 1 1/5, 1 6/10, 2, 2 , 2 4/5, 3 1/5 and 4, while for the solid steps (solid single blocks) it can be 4 , 5 1/5, 5 , 6, 6 1/3, 6 , 7 1/5 and 8. The finish of the frontside can be split, flamed, honed, polished and the edge can be chamfered, quarter round, bull-nosed or shaped.

Natural surface: the thickness of these stairs is calibrated only in the frontside for a depth of 2 because the thickness of the slabs with natural surface is always varing. The difference between the calibrated frontside and the remaining part of the lower surface is +/- 1 1/5.

Machined surface: the surface and the frontside are machine worked and can be flamed, honed, polished, bush hammered, sand textured and semi-polished. The thickness is calibrated in the whole lower surface.

The surface of the risers can be flamed, honed, polished, bush hammered, sand textured and semi-polished. Their thickness is usually 0 ¾”, but it is possible to have risers with a thickness of 1 1/5” or more.

 
     
Stairs for interior

 

 

 

     


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Stairs for exterior