The following case study was published by Gridforce. It shows that possible dangers of buying other grid type systems. This information could be very useful to those considering this type of installation so we have duplicated the content here for your information.

The picture above is a competitors grid manufactured from HDPE, as you can see all the black bits are plastic that have broken off. When it comes to plastic pavers on the market, there is often a discussion about the difference in the type of plastic used to manufacture the paver.

Most plastic pavers on the market are manufactured from what is known as a HDPE (high density polyethylene), which is a polyethylene thermoplastic made from petroleum. High density polyethylene is a readily available plastic, therefore economical in cost. Although HDPE has a high tensile strength, the material is rigid, and in sub-zero temperatures and the freeze thaw cycle; the plastic becomes more brittle and is subject to stress fractures and cracking.

Gridforce is manufactured from LDPE (low density polyethylene). LDPE is a thermoplastic made from the monomer ethylene and is more difficult to get hold of, consequently a more expensive product. LDPE is less brittle and more flexible, therefore when used in a car parking situation can cope more effectively with the lateral stress movement created when being trafficked.

When grid pavers are tested for strength, they are usually analysed when filled with aggregate. As a result, this doesn’t give a true reading of the strength of the plastic as it is relying on the gravel. Gridforce is however tested empty. This means that the tensile strength can only increase when the pavers are filled.

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We’ve just added the video below to our Gridforce information pages. It demonstrates just how effectively Gridforce can drain rainwater away from the surface compared to a traditional asphalt surface. These were both taken during the same downpour here in Guernsey.
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Another successful installation carried out by Ace of Spades at Mill Cottage – this is the small car park past the fire station on the left hand side . The project was completed on time and, importantly, within budget. Gridforce GF40 has been put down over 940m2. No more puddles will form in this car park , because the water will drain away!
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Network Rail needed extra parking for their new industrial units alongside the railway track in Warrington. Their main concern was the run off of water from the rail line flooding the new car park beneath, and therefore needed a SuDS compliant solution. Prior to the work, the area was an un-used grass land comprising of excess soil mounds and weeds.As an alternative to traditional tarmac carparks that would require expensive drainage systems, consider the use of the Gridforce permeable paving system in conjunction with the use of tarmac. Gridforce products fully comply with SuDS regulations and therefore can act as run off from the tarmac areas. This eliminates the requirements for underground drainage.
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Slutchers Lane - WarringtonThe ChallengeNetwork Rail needed extra parking for their new industrial units alongside the railway track in Warrington. Their main concern was the run off of water from the rail line flooding the new car park beneath, and therefore needed a SuDS compliant solution.As an alternative to traditional tarmac carparks that would require expensive drainage systems, consider the use of the Gridforce permeable paving system in conjunction with the use of tarmac. Gridforce products fully comply with SuDS regulations and therefore can act as run off from the tarmac areas. This eliminates the requirements for underground drainage.Prior to the work, the area was an un-used grass land comprising of excess soil mounds and weeds.ProjectNetwork Rail Car ParkApplication1005m2 gravel finishProductGF 50 blackLocationSlutchers Lane, WarringtonThe SolutionThe land was prepared for laying the grid by removing excess grass land and digging down to the substrate.  MOT type 3 was then laid and compacted to provide a firm surface and allow for adequate drainage. A sheet of geotextile membrane was laid on top of the sub-base to prevent any further weed growth and act as a separating layer. This was then covered with a layer of sand providing a levelling layer and forming a bedding layer for the grid. The GF50 pavers were laid and connected into place to cover the required area.  The grid was then in filled with 14mm angular gravel as selected by the client.ConclusionThe installation work on this car park was carried out in December 2012 and within a short space of time the original grass waste land had been transformed and was available for use.  The Gridforce ground reinforcement system allows vehicular stability, water infiltration and the reinforced gravelled finish the customer required.Client Benefits
  • Gridforce has a 10 year product guarantee
  • Gridforce units weigh only 1.4kg each (5.6kg/m2), well within safe manual handling limits
  • Gridforce is manufactured from 100% recycled plastic
  • Gridforce’s patented lug and slot connection aids line and level accuracy and facilitates fast installation
  • Local materials used in construction of the car park base and stone used in filling Gridforce
  • Permeable surface means no drainage infrastructure required and no storm water run off issues
  • Rainwater returned to the water table, ensuring no further burden on existing sewer system and alleviating risk of flooding
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kahProjectKew and Ham Sports AssociationApplication2300m2 gravel finishProductGF 40 blackLocationTwickenhamInstallersGridforce Installation TeamThe ChallengeKew and Ham Sports Association needed a new aesthetically pleasing car park for their newly built Multi Use Games Area (MUGA). As well as trafficking cars, the car park needed to be able to withstand heavy goods vehicles for the on-going work.Prior to the work, the area was grass land which had been worn down by previous traffic leaving a muddy mess.The SolutionThe land was prepared for laying the grid by removing excess grass land and digging down to the substrate.  MOT type 3 was then laid and compacted to provide a firm surface and allow for adequate drainage. A sheet of geotextile membrane was laid on top of the sub-base to prevent any further weed growth and act as a separating layer. This was then covered with a layer of sand providing a levelling layer and forming a bedding layer for the grid. The GF40 pavers were laid and connected into place to cover the required area.  The grid was then in filled with 14mm angular gravel. Two colours of gravel were used to differentiate the parking and the access routes. Additionally, parking markers were used to highlight the parking bay areas.ConclusionThe installation work on this car park was carried out by the Gridforce installation team in June 2012, and within a short space of time the original grass land had been transformed and was available for use.  The Gridforce ground reinforcement system allows vehicular stability, water infiltration and the reinforced gravelled finish the customer required.Client Benefits
  • Gridforce has a 10 year product guarantee
  • Gridforce units weigh only 1.4kg each (5.6kg/m2), well within safe manual handling limits
  • Gridforce is manufactured from 100% recycled plastic
  • Gridforce’s patented lug and slot connection aids line and level accuracy and facilitates fast installation
  • Local materials used in construction of the car park base and stone used in filling Gridforce
  • Permeable surface means no drainage infrastructure required and no storm water run off issues
  • Rainwater returned to the water table, ensuring no further burden on existing sewer system and alleviating risk of flooding
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Twycross ZooThe ChallengeContinuing its policy of expansion, Twycross Zoo commenced construction of its new £7,000,000 Himalaya Visitor Welcome Centre in March 2009.Himalaya was designed to emerge naturally from the landscape, and the use of local sustainable materials, ground source heating and landscaping to attract biodiversity were considered fundamental to the development.Design and construction of Himalaya was entrusted to Kier Marriott Construction Ltd, through its Nottingham office.  Various options were considered for the car parking, but bearing in mind that materials used on the previous car parking areas had not always been an unqualified success, the Gridforce ground reinforcement system was selected and approved.  After a 12 month construction period, the Himalaya Centre opened to visitors in March 2010.Application: Parking for new visitors centreLocation: Twycross Zoo, LeicestershireInstallation Date: Early 2010Client: Kier Marriott Construction Ltd (Nottingham) -appointed design and build contractor for Twycross Zoo.Gridforce Solution2060m2 of Gridforce GF40 pavers in black, manufactured from 100% recycled plastic.Construction DetailsBase: 300mm of crushed stone on a layer of geotextileBlinding Layer: 20mm of coarse grid sandSurface material: Gridforce GF40 pavers (unit size 500x500x40mm but delivered pre-connected in 1m2 = 4 pavers per panel). Pavers filled with 10mm angular granite.Client Benefits
  • Gridforce units weigh only 1.4kg each (5.6kg/m2), well within safe manual handling limits
  • Gridforce is manufactured from 100% recycled plastic
  • Gridforce’s patented lug and slot connection aids line and level accuracy and facilitates fast installation
  • Local materials used in construction of the car park base and stone used in filling Gridforce
  • Permeable surface means no drainage infrastructure required and no storm water run off issues
  • Rainwater returned to the water table, ensuring no further burden on existing sewer system and alleviating risk of flooding
  • Carl Ellis of Melfort Construction commented that ‘the pavers were easy to lay, enabling us to complete installation on time.  We were also very pleased with the level of support on site from the Gridforce representative and I know that Twycross Zoo are very happy with the appearance of the car parking area’.
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