MetroPave Installation Guide
- Excavation: Excavate ground to the required depth and compact base. If required install the edging restraint such as kerbing or concrete edging.
- Geogrid: Lay geogrid for additional ground stability. Not always necessary for light loads such as shed bases and paths or in areas with very little ground settlement.
- Free draining sub-base: Introduce a Type 3 sub base layer to ensure optimal drainage, typically of a compacted depth of 150-200mm. MOT Type 1 is not suitable, as it has too much fine material that will clog. Drainage of this layer is important since if it constantly water logs without proper management it will fail.
- Geotextile: Lay non-woven geotextile to stop the bedding layer from migrating or being washed away causing unstable settlement.
- Bedding: The bedding layer will differ depending whether grass or gravel is the required finish.
- For a gravel bedding, a bedding layer of 30mm should be compacted.
- For grass finish, mix then compact a 4:1 ratio of 5mm grit or sharp sand to a layer of 30mm. (Naylor recommends using 5mm grit for heavy loading)
- Grid: Lay the first layer of grid along the longest straight edge for alignment, leave 15-25mm expansion gap if against a kerb or solid edging. Grids can be attached via the lugs and slots on the side. MetroPave grids can be cut with a handsaw or circular saw to fit the required area.
- Infill: Backfill grids with the suitable infill material for the desired finish then lightly compact the layer to improve stability.
- For gravel finish, fill grid with 5-15mm angular gravel (rounded gravel or pea shingle will migrate out of grid during use).
- For grass finish, fill grid with a good quality friable top soil or 60/40 root zone or preferably a blended high quality free-draining sandy loam. Area should not be trafficked until the grass has established (typically 8 weeks).
Contact Naylor or see product brochure for more information on grass blends.