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Initial
preparation of the ground is carried out as described earlier. In areas subject to traffic
a roller or plate vibrator should be used. These are readily available on hire. Areas
subject to heavy traffic will require a base layer of compacted hardcore or gravel. Block
Paving is laid on a layer of fine washed sand, screeded and levelled to an uncompacted
thickness of 50mm (one tonne of sand will cover approx. 10m2). The top level of
the sand layer should be about 10mm proud of its final finished level to allow the blocks
to be compacted down into the sand. The laying of blocks can now commence, starting from a
corner. A substantial area of blocks should be laid before filling in gaps with cut
blocks.
On completion of the area, a plate vibrator should be used to compact the blocks into
place. Then fine dry sand should be swept over the surface and two or three passes made
with the vibrator keeping sand under its leading edge to properly fill the joints. |
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