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Selecting the right product for your project will be determined by several factors, the type of loading expected, the frequency of use and the strength of the in situ soils. When assessing the loading frequency, please note that the entrances, exits and any access roads undergo significantly increased loading frequency compared to the parking bays. If you have further questions, please contact us.

Pedestrian loading

Pedestrian loading frequency Criteria TurfMesh product
Emergency access Single day use, no more than once a year TurfMesh 1000
Low footfall, occasional use Low footfall traffic, single day used, no more than 20 days per year* TurfMesh 1000
High footfall, occasinoal use High footfall traffic single day use no more than 20 days per year* TurfMesh 1400
Intensive occasional use High footfall traffic used for up to 7 consecutive days once a year or for use up to two consecutive days on a weekly basis TurfMesh 1400
Permanent use Medium footfall traffic used on a daily basis TurfMesh 1800

* at least 5 days should be provided between loading cycles

Vehicular loading

Vehicle loading frequency Criteria TurfMesh product
Emergency access Single day use, no more than once a year  TurfMesh 1400
Low number occasional access Single day use 100 vehicle movements per day no more than 20 days per year*  TurfMesh 1400
High number occasional use Single use 1000 vehicle movements per day no more than 20 days per year* TurfMesh 1800
Intensively trafficked occasional use 500 vehicle movements per day for up to 7 consecutive days twice per year** or up to 2 consecutive days on a weekly basis TurfMesh 1800

* at least 8 days should be provided between loading cycles between april –october
** at least 30 days should be provided between loading cycles between april –october

Soil strength

CBR is the Californian Bearing Ratio test usually performed by an engineer to determine the strength of the ground.

To assist in this determination, the table below presents field observation details from BS 5930 to help determine the expected strengths of the in situ soils. Please note that the figures given refer to the underlying soil below the root zone and not the topsoil.

Soil strength In situ manual test Estimated shear strength (kN/m2) Equivalent CBR (%)
Very soft Finger easily pushed in up to 25mm 0-20 <1
Soft Finger pushed in up to 10mm 20 - 40 1 - 1.5
Firm Thumb makes impression easily 40 - 75 1.5 - 6
Stiff Can be indented slightly by thumb 75 - 100 3 - 6
Very stuff Can only be scratched by thumb 150 - 300 12 - 6

As an added complication, the drainage characteristics of the existing soils can exert as great an influence as those of the underlying soils. We recommend that soil drainage be considered from the outset. Where porous pavers are to be used, a sub-base will need to be installed before the placement of the pavers in order to reinforce the ground and help with the drainage.

Related products

Stock code Description My Geoworks Downloads
TurfMesh1000 Geomat, 6500N - 2m x 20m roll - Suitable for pedestrian, occasional car use and temporary access
TurfMesh1400 Geomat, 9500N - 2m x 20m roll - Suitable for occasional use of light commercial vehicles
TurfMesh1800 Geomat, 11500N - 2m x 20m roll - Suitable for frequent grass parking areas and occasional use of HGVs
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