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Laying paving slabs involves a good deal of physical labour, but in terms of technique, it is more complicated than tiling a wall. Accurate setting out and careful laying, especially during the early stages, will help you achieve perfect results.
Tools Required:
Step 1: Setting out the paving area
Whenever feasible, plan an area of paving so that it can be laid with whole slabs only. This eliminates the arduous task of cutting units to fit. Use pegs and string to mark out the perimeter of the paved and check the measurements before you excavate. You can use a straight wall, as well as a datum line and measure away from it, or allow for a 100 to 150mm margin of gravel between the wall and paving.
A gravel margin not only saves time and money by using fewer slabs but also provides an area for planting climbers and for adequate drainage to keep the wall dry. Any paving must be 150mm below a damp-proof course, in order to protect the building.
As paving slabs are made to fairly precise dimensions, marking out an area simply involves accurate measurement, allowing for a 6 to 10mm gap between the slabs. Some slabs are cast with sloping edges to provide a tapered joint and should be buttered edge to edge.
Step 2: Preparing a base for paving
Paving slabs must be laid upon a firm level base, but the depth and substance of that base depends on the type of soil and the proposed use of the paving.
Compact the soil with a garden roller and then spread the sand with a rake and level it by scraping and tamping with a length of timber. To support heavier loads, or if the soil is composed of clay or peat, lay a sub base of firmly compacted hardcore (broken bricks or crushed stone) to a depth of 75 to 100mm before spreading the sand to level the surface. If you plan to park vehicles on the paving, increase the depth of hardcore to 150mm.
Step 3: Laying paving slabs
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