Hybrid Grass Installation

1. SECTION

Prepare lower rootzone layer;

  • Levels. Maximum allowed undulation
    < 10mm measured under 3 meter straight edge at 3 meter intervals in longitude and lateral direction;
  • Soil stability > 1,5N/mm² measured by penetrometer (cone 1 cm²)
  • Soil fertility level in accordance with applicable climate zone, type of grass and watering regime;
  • Granulometry of the lower rootzone in accordance with HYBRIDGRASS specifications.
  • Sprinkler heads will need to be levelled at 20mm above finished lower rootzone level. Ensure the surrounding soil is evenly compacted;

2. SECTION

Clear the field runoff areas / perimeter of obstacles and waste. Allow 3 meters clearance at one side of the field to place the HYBRIDGRASS rolls;

3. SECTION

Unload the HYBRIDGRASS rolls with 4m long carpet pin and transport the rolls to the cleared area beside the field. Ensure no vehicles traverse the prepared and levelled lower rootzone layer within the playing field contours and the runoff areas that will be fitted with HYBRIDGRASS carpet;

Hybrid Grass Installation

4. SECTION

Set out the corner points of the area that will be fitted with HYBRIDGRASS carpet. Allow an excess of +150mm to all sides, drill in a solid marker pin at each corner and fit a yellow or white string line between each marker pin; 

Hybrid Grass Installation

5. SECTION

Set out the corner points of the area that will be fitted with HYBRIDGRASS carpet. Allow an excess of +150mm to all sides, drill in a solid marker pin at each corner and fit a yellow or white string line between each marker pin; 

Hybrid Grass Installation

6. SECTION

Unroll the carpet using a tractor mounted equator at the 3 point linkage of a 40HP tractor or use a roller wheel device at the front link of a 20-30HP tractor. All tractors to be fitted with wide turf tyres;

Hybrid Grass Installation
Hybrid Grass Installation

7. SECTION

The first roll is manually to be moved into position at one side to meet the string line that marks the outer perimeter of the carpet + 150mm. ensure the carpet is gently stretched lengthways ensuring no wrinkles appear;

8. SECTION

Manually turn over 400 mm of the carpet edge on the side of the direction of installation (side B) of the first roll (and each consecutive roll) and cut clean the excess backing up to the first tuft line without artificial turf fibres fitted. This strip of cleared backing will act as the carrier tape for the carpet adhesive;

9. SECTION

Unroll the second roll and manually bring the carpet into position whereby the outer tuft line will be covering the previously cleared adhesive carrier strip. Ensure all wrinkles are stretched;

Hybrid Grass Installation

10. SECTION

Manually turn over 400 mm of the carpet edge on the side opposite of the direction of installation (side A) of the first roll (and each consecutive roll) and cut clean the excess backing up to the first tuft line without artificial turf fibres fitted. This strip of cleared backing will act as the carrier tape for the carpet adhesive;

11. SECTION

Prepare the 1 component PU carpet adhesive. Only use adhesive specified for HYBRIDGRASS. Gently mix the adhesive in the tub and pour into the HYBRIDGRASS Adhesive Applicator (HAA). Fill the bucket to ¾ of the available volume;

Hybrid Grass Installation

12. SECTION

Place the HAA into position at the outer edge of the adhesive carrier strip, pointing the triangle shape into the direction of the application. Open the gate valve at the rear of the HAA and start walking the HAA over the adhesive carrier strip in such a way that the adhesive is dispersed over this strip. The amount of adhesive applied onto the strip can be altered by opening and closing the gate valve and the speed of walking. The viscosity of the adhesive is depending on ambient temperatures and will dictate the settings of the HAA.

Hybrid Grass Installation
Hybrid Grass Installation

13. and 14. SECTION

Ensure the level of the adhesive in the bucket of the HAA remains at required level with a minimum fill of 10%;

If weather conditions dictate, the adhesive carrier strip and the adhesive itself will have to be sprayed with a mist of water to improve the curing time of the adhesive;

Hybrid Grass Installation

15. SECTION

When the adhesive feels ‘sticky’ the prepared carpet (10.) will be gently unfolded and moved onto the adhesive ensuring both tuft lines match perfectly

Hybrid Grass Installation
Hybrid Grass Installation

16. SECTION

After closing the seam it will have to be rolled by using a specific HYBRIDGRASS Carpet Roller (HCR). The timing and intensity of the rolling is depending on the weather conditions. After both carpets have been joined the adhesive will have to be checked every 10 minutes by gently lifting the edge of top carpet. Once the bottom carpet is no longer coming loose from the top carpet the rolling will commence. Roll the seam twice in a gentle pace and ensuring no wrinkles appear in front of the HCR;

Hybrid Grass Installation

17. SECTION

Allow for sufficient curing time (6-12 hours) before the carpet is ready to receive the infill. Check the seams and repair any loose seams with HATKO repair glue in cartridges;

18. SECTION

Repeat steps 8. to 17. until the complete field has been covered by HYBRIDGRASS carpet;

19. SECTION

Fold back the HYBRIDGRASS carpet for 1 meter following the outer perimeter of the field;

20. SECTION

Excavate a shallow trench (100mm wide and 150mm deep) at one goal end and one side lengthways of the field. Trench along the inside of the string line and place the spoil on the outside of the string line. Unfold the carpet, place in the trench and stretch whilst backfilling with the spoil that was deposited beside the trench. Compact the trench by tractor tyre and re-level the soil;

21. SECTION

Start the carpet infill procedure by preparing the infill or ordering in premanufactured infill. Deposit the infill on a clean hard surface as close as possible to the field entry. Ensure the material is dry and keep sufficient amount of plastic liner available to cover the infill in case of rain;

22. SECTION

Load the infill in the hopper of a specialist sports field top-dresser, either tractor mounted or fitted as attachment to a Guzman or JD Gator type of vehicle. All equipment has to be fitted with low ground pressure turf tyres. The maximum weight should not exceed 1500 kg per load. Spread the infill in layers of maximum 6mm over the contours of the field ensuring an even spread either by drop spreader or rotary spreader;

Hybrid Grass Installation
Hybrid Grass Installation

23. SECTION

Use a tractor mounted HYBRIDGRASS Infill Brush (HIB) to gently brush in the infill in the carpet whilst exposing the artificial turf fibres. Start brushing in the counter direction of the direction of the fibres in the longitude direction of the carpet. Use a hydraulic top-link attachment to the tractor in order to easily adjust the level of the brush to the surface;

Hybrid Grass Installation

24. SECTION

After all infill has been dispersed in the carpet and fibres have been exposed the next application of infill can be spread by repeating 22. and 23.;

25. SECTION

Complete the infill to an overall depth of 35mm measured with an infill tester;

Hybrid Grass Installation
Hybrid Grass Installation

26. SECTION

Ensure the connection to the surrounding runoff area is level and without any obstacles or ridges;

Hybrid Grass Installation

27. SECTION

After reaching an infill level of approximately 25-30mm the carpet on the remaining two sides of the field that had not yet been fixed in the soil can be fixed according the procedure as specified in 20.;

28. SECTION

Expose any irrigation sprinkler heads by placing a X in the carpet of approximately 100 x 100mm from the centre of the sprinkler head and fold down the carpet adjacent to the sprinklers. Mark the sprinkler by tagging with a sprinkler flag and digitally survey the location of each sprinkler head prior to the HYBRIDGRASS installation; 

Hybrid Grass Installation

29. SECTION

Apply the start fertiliser based on soil chemical analysis and prepare the seedbed;

30. SECTION

Drill in the grass seed by using a specialist tractor mounted spike-seeding device, Redexim Speedseed or Blec Multiseeder or equivalent.

Hybrid Grass Installation
Hybrid Grass Installation
Hybrid Grass Installation

Tools and materials required for HYBRIDGRASS installation:

Item Description Amount or application rate
3-meter aluminium straight edge To check the level of the lower rootzone layer 1 no
Penetrometer To check the stability of the subbase 1 no
String line – ø 0,5mm – yellow, white or blue To mark the outer perimeter of the field 400 meter
Steel pegs – ø 10mm – 500mm long To fix the corner points and to attach the string line to 6 no
Walk behind knife To cut the excess carpet from the HYBRIDGRASS rolls 2 no
Delphin knife + holder For manual cutting of wrapping and carpet 4 no
Universal blades Loose ‘Stanley’ blades for knifes 100 no
Manual level bar To rectify uneven spots in subbase 1 no
1 component adhesive To join the HYBRIDGRASS carpet rolls 5 kg tub / 140 meter seam or 35 gram/m¹
Adhesive in cartridge To make repairs when checking the seams and fix small areas 3 no boxes of 12 x 390 g cartridges
HYBRIDGRASS adhesive applicator To apply the adhesive to the carpet glue tape 1 no
HYBRIDGRASS carpet roller To compress the seam after the adhesive as been applied 1 no
Latex disposable gloves To be used whilst applying carpet adhesive 1 box of 100 no
Protective gloves To be used for carpet fitting 20 pairs
Padded knee protectors To be used whilst fitting the carpet glue seams 2 pairs
Loader or excavator To load the infill mix into the hopper of the topdresser 1 no – capacity of loading bucket minimum 500 liter
Compact tractor + topdresser To spread the infill mix to the surface 1 no drop spreader or rotary spreader – max load weight 1,5 ton. Fitted with 4 turf tyres, evenly spaced over the width of the spreader
Compact tractor + HYBRIDGRASS static brush To move the infill down and straighten the carpet fibres 1 no, fitted with hydraulically adjustable top link
Tractor mountable spring tine device To be used when more aggressive raking is required when infill mix is moist 1 no, 3 meters wide
HYBRIDGRASS infill mixture According HYBRIDGRASS specification 35 mm loose bulk / m²