Sharp Sand — The Complete Guide

Sharp sand is one of the most versatile aggregates on any construction project. From bedding block paving to mixing concrete, knowing when to use sharp sand versus building sand will save you time, money and headaches.

What is Sharp Sand?

Sharp sand (also called coarse sand, grit sand, or concreting sand) is a coarse-grained, angular sand with particles typically 0–4mm in size. The angular, irregular shape of the grains is what makes it "sharp" — this interlocking texture gives mortars and concrete their strength. It's washed to remove silt and clay, making it ideal for structural applications.

Common uses

Block paving bedding layer (usually 40mm depth)
Concrete mixing (with cement and gravel)
Floor screeds
Drainage and soakaway applications
Laying patio slabs (mixed with cement)
Bricklaying mortar for below-ground and external work
Children's play area sand pits

Sizes & grades

Typically 0–4mm. Some suppliers offer coarser variants up to 6mm. For block paving bedding, a consistent 0–4mm grade gives the most reliable result.

How much do you need?

For a block paving bed at 40mm depth: length × width × 0.04 × 1.6 tonnes/m³. A 5m × 4m driveway needs approximately 1.3 tonnes. For screeds, multiply floor area × depth (typically 65–75mm) × 1.6.

Pro tip

Don't use sharp sand for finishing or pointing — it's too coarse. Use building sand instead. And never use building sand for structural concrete — it lacks the strength of sharp sand.