Laying a lawn with artificial grass demands a preparatory work. At first you should choose the covering on which the grass will be laid. Sometimes the grass is laid directly on asphalt, and it’s absolutely wrong as the lawn will be rigid, and it is impossible to calculate the amount of drainage precisely. The most correct method includes preliminary dredging of the place where a lawn will be situated.
The Artificial Lawn Structure
The depth of the dredging can fluctuate depending on the size of a lawn and its purpose. Usually the depth is 20-30 cm. After the removal of soil the cavity is filled with crushed stone, which fraction is about 20-40 mm. The thickness of this layer makes a half of the height of the removed soil. Then the crushed stone of the smaller fraction (5-10 mm) is filled over the crushed stone of the larger fraction. The height of the layer is maintained after the calculation of thickness of the most artificial covering. The remained emptiness is filled up with granite elimination. This method is good for the lawns that are used for active games. Decorative artificial grass can keep within on an adding layer (5-10 cm).
At this stage the drainage works are carried out. A small slope on the lawn is created –either on the one side of it or from the middle to the perimeter. When the area of the artificial covering is big, then it is necessary to use a laser level or a theodolite to make the slope look as it should be. If your district is rainy or it is placed on a high level of ground waters, then special drainage pipes under a lawn or a platform are laid. This laying is conducted at the level of adding crushed stone of large fraction. At the stage of drainage system installation the dredging depth before adding the crushed stone has to be about 50-60 cm. The works on laying covering on football fields and courts demand difficult drainage systems which include built-in pipelines and trays for collecting water
The use of geo textile substrate is justified in certain cases. It can be helpful in zones with a large number of an atmospheric condensation – the drainage of sand doesn’t take place in this case.