STAIRS

Materials

Surface

in its natural state; unprocessed.

fissured longitudinally; natural appearance.

elongated notches or incisions that provides the stone a rustic appearance.

having surface indentations produced or appearing to have been produced by a special tool

high temperature treatment that granitic rocks’ surfaces are subjected in order to obtain a rough, cratered and vitreous surface. The final appearance of the stone is rustic.

roughen or clean (a surface) with a jet of sand driven by compressed air or steam.

polished but not shiny; rustic surface.

to cut the stone’s surface with a diamond teeth disc or steel strapping; the resulting surface is smooth but rough.

similar to the polishing process, but the surface is not shiny.

abrasive grain are applied with polishing machines, obtaining a smooth and shiny surface of the stone.

The mortars and the glues

Mix calculations
For 1 m3
of dry sand
  • From 800 kg to 1100 kg of cement.
  • From 400 kg to 1000 kg of hydrated lime.

Cementitious adhesive are used according to recommendations of the manufacturer.

Sand grain sizes

JOINTS

  • 1,5 – 2 mm
  • 2 – 10 mm
  • > 10 mm

JOINTS

  • 1,5 – 2 mm
  • 2 – 10 mm
  • > 10 mm


Remarks


o To lay white or light coloured stones, use white lime or cement in the mortar mix.
o It is better to try the mortar mix on a sample of stone to see if stains appear before applying it to a great surface.
o It is better to use a low alkaline blinder.