What makes up an artificial lawn?
Installing artificial grass may require significant preparation of the existing site to ensure a stable surface that will last a long time. While installations on concrete or timber surfaces can be as simple as gluing or stapling the grass itself to the surface, a typical installation in a back yard is quite complex.
Removal of existing grass and organic matter.
The site must be cleared of all organic matter to ensure a solid sub-surface and to eliminate any potential regrowth of grass and weeds through the new artificial surface. Depending on the site this can range from removing just the topsoil to excavating until a solid compactable surface is found. This may be anything from 70mm to 200mm in depth.
A Geotextile membrane (commonly called Mudstop) is a special woven fabric designed to stop the soil below from leeching upwards into the base course. It also strengthens the sub-surface by keeping the compacted base materials from sinking over time. Geotextiles are designed to last decaades.
The base is critical to the overall success and stability of the installation. Layers of material are compacted until the required supporting depth is achieved. The final few centimetres will be a fine material that leaves a very smooth flat surface.
Installing the grass
The grass is rolled out in strips and generally pinned at regular intervals around the perimeter. Seams are bonded with special tapes to give near invisible joins. When complete the pile of the grass is brushed up and a significant amount of silica sand is spread and brushed into the surface. The weight of the sand keeps the grass in place as well as filling gaps between the fibres to ensure they stay upright. Up to 12kg/sqm of infill sand can be used depending on the pile height of the grass.