Synthetic grass

Sub base preparation

The most important element of constructing a synthetic grass facility is the sub base preparation.
Inadequate backfill materials-, compaction and insufficient drainage is a recipe for failure to any installation and/or construction project.
Depending on the size of the facility and type of sport, it is important to consult with professionals in the civil- and geo engineering fields for their professional advice and support.
Although expensive, geotechinial tests are recommended for all proposed large sport field facilities i.e. soccer fields.

Drainage:
Drainage considerations for large sport fields are very important.
The biggest cause in the deterioration of synthetic pitches is the presence of standing water around- or beneath the pitch.

Generally, in the case of a non water permeable pitch, the surface water and the water that drain through the perforated backing of the artificial grass will follow the slope to the lowest areas of a the base.
This water needs to be let into an outlet and carried away from the pitch area.

Drainage requirements for a water permeable base needs additional sub surface drains to collect the water that seeps through to the sub base.
The base is usually leveled with a slope between 0.8 - 1%.
The location and surroundings of the proposed site and the water outlet locations are important factors in the design of a drainage system.
There exists a close relationship between soil permeability, spacing and depth of drains.
The capacity of water that drainage pipes can carry depends on the pipe's inside diameter, the slope at which it will be installed and the material the pipes are made of.
The installation method is just as important for a successful system. Therefore, we strongly recommend to include consultations with drainage professionals in the design phase of the proposed pitch.

Base:
Synthetic grass may be installed on a well engineered asphalt base, unbounded base (compacted aggregates) or concrete.
Asphalt base:
A compacted aggregate foundation is finished off with asphalt which result in the most durable and stable base to date.
The synthetic grass is then installed over the asphalt wearing course.
Some sport regulations requires the installation of shock pads to provide shock absorbency.
The shock pad will be installed over the asphalt wearing course followed by the installation of the synthetic turf.
Most asphalt bases are non water permeable.

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Unbounded, free draining base:
The base foundation consists of compacted course and fine aggregates.
A shock pad, if required, are then installed over the compacted base.
If a shock pad is not required, we recommend installation of a geo synthetic material between the base aggregates and artificial turf.
The benefit of an unbounded base is that it is water permeable, less costly than an asphalt base but it is not as durable than asphalt and might need replacement or repairs within a few years.

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Reinforcement Cement Pitches:
Smaller size sport pitches can be constructed by means of reinforced concrete slabs minimum 150mm thickness.
The synthetic grass is then installed on top of the concrete surface.

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One very important thing to remember, NEVER install synthetic playground grass on a concrete slap, cement or paving.
It completly defeat its purpose. Make sure your synthetic grass is installed on a well designed drainage base system.

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Contact Us for more information regarding drainage and sub base construction for Synthetic grass installations

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