Indian Sandstone Paving Installation

There are many different techniques for laying paving.  We regularly receive questions from clients about the best way to lay natural stone paving.  Concrete was the dominant paving material in the UK until the recent explosion in popularity of imported stone.  The most widely used technique for installing concrete paving has always been a 10 parts sharp sand:  1 part cement dry mix.  Techniques for laying Indian sandstone paving are different, the thickness variation of Indian Sandstone requires it to be laid on a 4 parts sharp sand:  1 part cement semi dry mix.  The wetter mix allows the finished height of individual paving slabs to be adjusted to counter the variation in thickness.  When mixing mortar for natural stone it is important that the correct amount of water is added.  If the mix is too dry it will lack the flexibility required to adjust the finished height of the paving slabs.  If the mix is too wet then the slabs can sometimes sink under their own weight.  Another side effect of a wet mix is leaching, this is when moisture from the mortar leaches through the slabs leaving white staining and residue on the paving surface.  You need to be  particularly aware of leaching when laying some of the softer varieties of sawn sandstone.

By London Stone Blog | Published 17th November 2010
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