Installation

All our installations are carried out in accordance with BS7533, part 3 by our own highly trained crews.

Preparation:

The first step for our crew is to mark out the area to be paved. They will then carry out all excavation of the existing surfacing, making sure that the finished level of the new paved area will be at least 150mm below the damp proof course of any adjoining property. All excavated material is cleared from site.

The excavated area is compacted with the plate vibrator, and any soft areas dug out and filled with the sub-base material.

During this preparation stage it is important for us to establish the correct levels for drainage purposes. If the area is flat we will create a slight slope during the excavation. This needs to be a drop of  25mm over 1 metre across the width (1:40) and 25mm over 2 metres along the length (1.80).

If the area slopes towards the property then drainage channels, gullies or a soak away will be necessary. These will be installed at this stage along with any recessed manhole covers that may be necessary.

Edging:

All edge restraints are installed by setting firmly in concrete to the correct levels and haunched. Restraints can be kerb edgings, pre-cast edging, or blocks themselves. The blocks can be laid with the short side against the edge (a header or soldier course) or long ways against the edge (a single or double stretcher course) depending on your personal preference.

diagram

Laying:

The sub-base material (MOT type 1) is then laid within the edge restraints and compacted firmly with the plate vibrator to ensure there are no voids. At this stage we spread the sharp sand to a depth of 50mm, compacting it with the plate vibrator. A further 15mm of sharp sand is then spread over the area as a loose screed and levelled by drawing a rigid piece of timber across it. This becomes the laying surface.

The blocks are then laid hand tight only, starting in one corner, and at the bottom if there is a slope. To ensure an even distribution of colour and texture we draw the blocks from different packs during the laying procedure. Blocks are cut and in filled to the edge restraints. To ensure maximum strength pieces smaller than one third of a block are avoided where possible.

layingfinal sanding

Once the area is laid, we sweep the surface thoroughly to remove all chips and fragments and check to ensure there are no damaged blocks. If  there are any we replace them at this time.

The whole area is then compacted with two or three passes of the plate vibrator. We then sweep kiln dried joint filling sand over the entire area, ensuring it gets right into all the joints between the blocks.

Finally we vibrate the whole area again to force down the joint filling sand and fill any gaps, which may appear in the joints. The excess sand is swept off the surface and you have a new driveway, path or patio to be proud of.