Installation of artificial Turf

Artificial turf installation

Overview

JUTAgrass® can be installed on newly built bases or on existing bases such as tarmac or concrete surfaces. An elastic underlay is recommended to increase safety and the performance longevity of the playing surface. Any sub base must be stable and include some type of drainage system. In the case of an impervious base, a slight gradient must be incorporated to assist drainage. In the case of a pervious base, a lateral drainage system should be built into the sub base construction. The perimeter drainage system of a pitch must be connected either to the sewage system, soakage pit or have some means to freely drain into the ground.

New Constructions

Sports pitches are constructed with a number of different profiles (flat, sloped single plane, turtle-back, envelope, etc). Artificial turf may be installed on any of these pitch profiles.

For new constructions the site should be stripped of all vegetation and topsoil and trimmed and levelled using cut and fill techniques as required to the specified profile.

A well-engineered foundation is essential to the long-term integrity of a pitch. A pitch may be subjected to many different stresses such as frost heave, clay shrinkage, clay swelling and settlement. The degree to which the performance and durability of the playing surface will be affected by these forces depends on the site conditions, (e.g. climatic conditions and the type of sub-soil present and the type and depth of construction). It is therefore advisable to have a professional geotechnical survey of a site before a pitch is designed.

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Cut of subbase
1, 9 – JUTAgrass, 2 – crushed stone 0-4 – 3 cm, 3 – crushed stone 4-8 – 3 cm, 4 – crushed stone 8-16 – 5 cm, 5 – crushed stone 32-63 – 19 cm, 6, 13 – semipermeble subbase, 7 – gravel sand 2/15 around drenage pipe, 8 – drenage pipes, 10 – asphalt concrete layer – 4 cm, 11 – permeable asphalt layer 0/25 – 4 cm, 12 – crushed stone 32-63 – 22 cm

The depth of the sub-base will be determined by the architect or engineer based on the geotechnical and meteorological conditions of the site. If the aggregate sub base depth is in excess of 100 mm, a combination of layers of graded pervious base construction stone can be installed beneath a pervious graded capping stone (”blinding layer”). A blinding layer generally consists of a graded aggregate with particles between 0.063 mm and 8 mm.

JUTAgrass® can be installed directly on the lay stone or preferably on an elastic underlay laid between the blinding layer and the turf. The use of an elastic underlay has several benefits including increased safety, performance and turf longevity, while allowing for less elastomeric infill to achieve optimal playing characteristics. Newer generation elastic base systems for artificial turf are engineered with vertical and lateral drainage systems, and provide a thermal barrier for protection against frost heave.

The design of the piped drainage system beneath and/or around a pitch will depend on the type of profile, size of the pitch, sub grade conditions, runoff restrictions and the local climatic conditions.

The area of artificial turf may be enclosed by concrete curbs, or can be finished by securing the artificial turf around the edges in some other fashion.

Turf Installation

JUTAgrass® recommends that its turf products and systems be installed by specialists in installation using specialised equipment. Simple landscaping jobs may be installed by the individual without prior experience.

Prior to the installation of simple landscaping projects it is recommended that a landscape specialist, such as a landscape architect, prepare a detailed plan for the installation.

JUTAgrass® is delivered in rolls 2 to 4 meters wide. For laying of sports areas we provide an installation plan with precise instructions for the layout of the rolls. Ensure that the grass rolls are rolled out facing the same direction. The rolled out turf can be cut from the underside with a cutter or utility knife.

The rolls are initially positioned loose-laid. Before gluing, the edges of grass rolls are folded up to put a 300 mm seaming tape underneath. On the seaming tape, a two-component polyurethane adhesive is evenly applied along the middle of the strip in a 200 mm width using saw bar C3. Care must be taken to not apply too much or too little adhesive. Immediately after the application of the adhesive on the seaming tape, the folded edges of artificial turf are placed back pressed into the adhesive.

For sports, the JUTAgrass® is filled with quartz sand and/or elastomeric granulate. The line markings of playing areas are cut out according to the installation plan.

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Infill materials

Infill materials provide stability and performance of the artificial turf system. The infill materials are:

Sand infill – quartz sand
Elastomeric infill
Elastomeric infill types are:

SBR (Styrene butadiene rubber)
EPDM (Ethylene propylene diene rubber)
TPE (Thermoplastic elastomers)
Other types include PU coated SBR, acrylic coated sand, organic infill, etc.

Sand infill

A specific type of sand is needed to infill JUTAgrass® and must fulfill several requirements. The most important property of the sand grains is that they must be round in shape to avoid abrasion and splitting of the turf fibres. Angular sand will irreparably damage the turf and also cause severe skin abrasions to those sliding or falling on the surface. Another important requirement is that sand cannot contain too much chalk. This could cause excessive chalking of the surface, which results in compaction of the artificial turf and a change of the grass color. Various gradients of the sand particles are used to determine the finished surface playability and stability, but in all cases a proper infill sand must be used.

Elastomeric infill

Rubber infill is rarely used in the short pile height systems for tennis and field hockey. However it is one of the most important components in the long pile ”3rd Generation“ artifcial grass systems used for football and rugby. The elastomeric infill creates a ”synthetic soil“ that supports the grass fibres keeping them in an upright position. This ”synthetic soil” also helps prevent matting and bending turf fibres, in addition to providing the traction needed for the players.

The resilience of a 3G system depends as much of the infill as it does on the yarn. Of the most common elastomeric infill materials are coloured EPDM (black, grey, green) or regenerated rubber SBR (black). Recycled EPDM is occasionally used as are thermoplastic elastomers (TPE) or polyurethane-coated SBR.