Two paved areas can use identical blocks and perform very differently, because the thickness, pattern and the base underneath make most of the difference. Use this guide as a starting point and confirm details with a designer for demanding projects.

Match thickness to traffic

As a general guide:

• Pedestrian areas (paths, patios, garden walkways): thinner blocks, often around 50 to 60 mm.
• Light vehicles (home driveways, small parking): about 60 to 80 mm.
• Heavier traffic (delivery bays, commercial yards, roads with trucks): 80 mm or more, with a stronger base.

Block strength, quality and the base matter as much as thickness, so treat these figures as typical ranges rather than rules.

Choose a pattern

• Stretcher bond: blocks laid in rows like brickwork. Simple and quick, best for light traffic.
• Herringbone: blocks interlock at angles. It resists movement from vehicle turning and braking, so it is often preferred for driveways and busy areas.
• Basket weave: decorative, suited to walkways and patios.

The shape of the block affects which patterns are possible. See choosing the best paving mold models.

Build a proper base

1. Excavate and remove soft, organic soil.
2. Compact the subgrade so it is firm and even.
3. Lay and compact a sub-base of crushed stone or suitable granular material. Thicker for heavier traffic.
4. Spread a levelled bedding layer of sand, kept thin and even.

Most paving failures trace back to a poor base, not poor blocks.

Edge restraints and drainage

Paving needs firm edges, such as kerbs or concrete haunching, so blocks cannot spread sideways. Slope the surface slightly so water runs off and does not pond. Make sure runoff does not undermine buildings. Our guide to foundations and drainage explains why.

Compact and fill joints

After laying, compact the surface with a plate compactor, sweep fine sand into the joints and compact again. Top up the joint sand after the first rains.

Make your own blocks

If you want to produce your own, see how to make cabro paving blocks and the I Shape Paving Block Press.

• cabro
• driveways
• paving