Laying paving on sand is a simple and efficient technique for creating footpaths. You must nevertheless ensure that the paving stones are not too thin because sand does not offer a perfectly stable support and they may break. In this case, it is prudent to pour a thin layer of concrete onto the sand, on top of which you can attach the paving stones with mortar.
If the ground is particularly loose or moist, it may be necessary to dig a deeper hole and line the bottom with a layer of flat stones or gravel, before pouring the sand. The type of sand to use is mixed grade (granulometry 0-4mm). As far as the joints are concerned, they should be filled when all the stones are laid.
Sedimentary rocks are the result of the accumulation and compacting of mineral debris (i.e. other stones), organic debris (animal remains and vegetation, fossils), or chemical precipitation.
They are exogenous rocks, i.e. rocks which are formed on the surface of the Earth. Sedimentary rocks are present on 75% of the surface of the Earth's continents, but when considering its crust as a whole (from the surface to a depth of 22 miles (35 km)), they only represent 5% of its total volume.
The main sedimentary rocks are:
Mont du moulin 30750 Lanuejols FRANCE.