The cement-grout joints are subsequently chosen when:

a) The surface area should not be covered by sand, in other words – there ought to be no gap sand on the stones (on terraces)

b) In streaming traffic, so that the pull cannot withdraw the sand out of the gaps

The implementation is considerably more complicated as with filling the gaps with sand. It is necessary to build a concrete subbase, as each gravel pile might be prone to slight motion. The concrete subbase needs to leak water so that no frost heaves could occur in winter seasons. A layer of crushed stones and grout is applied onto the drainage concrete. On this layer, the stones are laid and subsequently pounded. The most delicate and awkward stage is the fill of the gaps with cement and grout. Only top quality materials and technical know-how ensure a long-lasting gapping. A special gapping system guarantees high quality – cf. the patented pointing system with SAMCO 88.

6 - 10 cm cobblestone

3 - 5 cm bed with crushed stones and cement

10 - 15 cm filter concrete

frost-protection layer

granitic small stones with Carrara-marble on a mortar bed with grout gaps

large stones with grout gaps and inlaid millstones