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Vanstone Paving Blocks: Guidelines for Installation
Reference
Kindly refer to the CMA's publications for best practice regarding the installation of concrete block paving. Link to CMA
- Edge restraint
- Placing of sand bed
- Laying of paving blocks
- Compaction of paving blocks
- Joint filling
Edge restraint
The function of the edge restraints is to retain the sand bedding and to ensure that paving blocks at the edge of the pavement do not creep outward or rotate under load with consequent opening of joints and loss of interlock.
Any suitable edge restraint consisting of kerbs, channels, or other may be installed on or within the subbase. Vanstone has a wide variety of kerbs and edgings available to suit every need.
Placing of sand bed
Spread a bedding of clean and well graded riversand evenly on top of the prepared foundation over the area to be paved. Please note: For Permeable paving a specially graded sand sizes 2mm - 6mm is required. Use a screeding method to place the sand to an uncompacted thickness of 30 +-10mm. This will ensure that slight uneveness in the subbase is evened out. Lay sand bed slightly in advance of the placement of the blocks but only to the extent that the particular area of paving can be completed on the same day.
Laying of paving blocks
The best pattern for interlocking and therefore strength is herringbone. Always observe pattern and line while keeping joints between blocks as small as possible. All Vanstone paving blocks have built-in spacer strips to give the ideal sized joints between blocks whilst being packed against each other. Place paving blocks on the freshly screeded sand bed, bumping each new block against the just-laid ones to get a snug fit. In order not to disturb the sandbed, work from on top of already placed blocks and move forward away from the starting point. Fill any gaps between full sized blocks and edges with cut blocks. Use an angle grinder or purpose made paving cutter.
Compaction of paving blocks
Compaction shall be such that damage to blocks is prevented. Use a 2-4 t light vibratory roller or a suitable plate compactor. At least two compaction passes shall be made over a paved area as soon as possible after laying and before any jointing sand is added. Complete the compaction of all laid blocks at the end of each day. A uniform even surface shall be obtained over the paved area. Paving that will be subjected to regular vehicle loads exceeding 30kN shall, after joint filling be locked up with at least five passes of a heavy pneumatic roller. Remove and replace damaged blocks before joint filling.
Joint filling
Fill joints between paving blocks with a fine dry sand like buildingsand or fine plastersand. Please note: For Permeable paving a specially graded sand sizes 2mm - 6mm is required. Use brooms to sweep sand into joints and compact again with a plate compactor sufficiently to settle the joint filling. Sweep away all surplus sand and remove.