Very often the road surface is used for hexagonal concrete slabs, called trill. These boards have a diameter 40 cm, and the thickness 12 the 15 cm. They are usually laid on a carefully prepared one, concentrated and even substrate, on a several -centimeter layer of sand or cement and sand bed. Similarly, standardized concrete paving slabs are also arranged 35 x 35 cm the 50 x 50 cm.
All the materials discussed here after laying should be firmly pressed to the ground. Stone cube and cobblestones are pressed by hitting with special compactors. Clinker bricks and concrete slabs are reached by hitting with a hammer, However, not directly, because it could cause, cracking, but by located on them, surface a piece of thick board.
When laying the surface elements. They are usually filled with sand or cement-sand mortar. The sanding of the sand into the crevices can be facilitated by pouring water (The filling of gaps made in this way is called silting). The disadvantage of this method is to inhabit in such filled gaps of various burdensome, weeds, whose removal is generally very difficult. In addition, such surfaces are difficult to keep clean. An important advantage of such surfaces (Especially in urban conditions) there is their partial permeability in relation to water and air, oo is beneficial for trees growing nearby.
The surfaces with crevices filled with cement mortar are less troublesome in operation. This filling not only prevents weeds and makes it easier to keep clean, but causes an increase in the mechanical strength of the surface, because the mortar introduced into the gap binds adjacent elements. The disadvantage of the surface with crevices filled with cement mortar is their impermeability in relation to water and air.