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Last edited 10 Oct 2020
How to lay block paving
Block paving, or brick paving, is commonly used for constructing pavements, patios, driveways and so on. It is may be used due to its decorative aesthetic, ease of installation, and the fact that the bricks or blocks allow for easy remedial work by removing and replacing those that are necessary.
The SuDS Manual published by CIRIA in 2015 defines block paving as: ‘Paving designed to allow rainwater falling onto the surface or runoff discharged over the surface to infiltrate through the joints or voids between the blocks into the underlying pavement structure.’
The first stage, once the area required for block paving has been established, is to excavate to a depth that means the finished surface of the blockwork will be at least 150 mm below the damp-proof course of the adjacent building to the paving (and that it drains away from teh building). The typical excavation depth is 200-250 mm below the finished paving level (this comprises 100-150 mm sub-base, 40 mm sand bed and 50 mm block or brick).
The ground should be excavated to a gradual slope to allow surface water to run away and not pool on the surface. If a drainage system is to be installed, the slope can be directed towards that. The typical slope is a 1 cm drop for every 60 cm length.
A skip may need to be hired to remove the excavated material. The amount of excavated material needing to be removed can be calculated by multiplying the surface area by the dig depth, as well as accounting for 20-30% extra for the bulking-up of the spoil material.
 Edge restraints
The edge course bricks and kerbs should be laid on a concrete foundation using a mortar bed, and hammered in gently, checking the line for the correct level. This edging should then be haunched by applying concrete to the outside up to approximately halfway (roughly 75 mm thick).
The herringbone pattern provides the strongest interlocking bond and is achieved by setting the blocks at either 45- or 90-degrees to the perpendicular. Those laying the blocks should always work from the paving that has been laid, not the screeded laying course.
Once all laid, the blocks should be carefully checked for alignment by stretching a string line along the diagonal courses. Concrete blocks tend to drift less than clay pavers which can require re-adjustment.
 Jointing and finishing
Jointing involves spreading kiln-dried sand over the surface of the block paving and sweeping this into the joints. This can be done whilst compacting the paving down using a compactor plate. Care should be taken to alternately pass over each section of paving at 90-degrees to the previous pass.
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