Laying RocBlocs
Installation advice for laying RocBlocs using a flexible paving system.
1. Site excavation. The ground should be excavated to a minimum depth of 200mm. This should be increased if the ground conditions are soft. You need to get down to good, firm sub-soil that does not contain any organic matter that will later decompose causing the area to subside.
2. We strongly advise the installation of a geotextile layer. This allows water to flow freely into the sub-soil but prevents the hardcore mixing with the sub-soil.
3. The sub-base should consist of at least 100mm MOT type 1 hard-core. This should be well compacted using a vibrating roller or plate.
4. Installation of the edgings or kerbs. Block paving must be well supported from the sides to prevent creeping of the paving blocks. The kerbs should be laid on a haunched semi-dry concrete mix.
5. 50mm of coarse grit sand is leveled across the whole area as the bedding layer. Aim for 20mm higher than the base of the RocBloc pavers to allow for compacting and screeding.
6. Compact the bedding sand layer. Aim for 5mm higher than the base of the installed pavers. Make up any low spots that appear.
7. Use screeding rails to give the final level of the bedding layer.
8. Lay the border or edge courses first
9. Lay the RocBloc pavers. All the full blocks should be laid first using a set line to maintain accuracy. Ensure even distribution of colour by mixing blocks from as many pallets as possible.
10. Cut in any edging blocks. RocBlocs can be cut using either a diamond blade or a block splitter.
11. Sweep the paved area clean and then apply kiln dried sand over the pavers, brushing in until all the joints are full. (Sand volume is generally about 2.5kgs/sq.metre.)
12. Final compacting with vibrating plate. Usually 2-3 passes will be sufficient. Ensure all joints are full of sand between passes.
*Finished paved height must be at least 150mm below any adjacent building D.P.C
*A minimum 1:60 fall across the paved area must be allowed for surface water drainage.