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This is a guide to how we lay block paving.
Terrain designs create a sub-base which is typically a type one road stone scalping base, this is permeable and helps to assist drainage. We then lay a 50mm bed of sharp sand across the entire surface of the driveway or patio. We also lay perforated membrane in order to prevent weed regrowth and damage from debris. Below is a full description of how we lay block paving.
The three courses we use for Block Paving, Road Stone Scalping Permeable Base, Sharp Sand and Block Paving
Mark out the area to be paved and remove all the existing surfacing to a depth so that the finished level is at least 150mm (2 bricks) below the damp proof course. For drainage purposes create a 1:80 slope during excavation that runs away from any building or fence.
Install any manhole covers, drainage channels and edge restraints as required.
Fill the excavated area with at least 100mm of Membrane Type One sub-base material and compact well with the plate vibrator, filling voids with sharp sand.
Spread sharp sand to a depth of 50mm, compact it with the plate vibrator and spread a further 15mm of sharp sand over the area as a loose screed and level correctly.
Lay one course of blocks on the sand along all edge restraints.
Lay the blocks hand tight only, with a joint gap of 2-5mm, starting in one corner and at the bottom if there is a slope. Lay blocks from at least three packs to ensure even distribution of colour. Cut in at edges using a block cutter or bolster chisel and club hammer.
Sweep the area thoroughly, particularly if a block cutter has been used. Replace any damaged blocks.
Compact the whole area with three to four passes of the plate vibrator in perpendicular on sand overlapping.