What is sharp sand?

Sharp sand is the coarse bedding material laid directly under block paving to create a stable foundation. Its angular particles, typically graded between 0.6mm and 2mm, compact firmly together and resist shifting when weight is applied, keeping your blocks level and preventing settlement.

The term "sharp" refers to the grain structure. Unlike fine, rounded sand, sharp sand has jagged edges that lock together, making it ideal for supporting the paving surface. A typical installation involves spreading sharp sand 30-50mm thick over a compacted sub-base, then carefully screeding it level before laying the blocks.

Sharp sand is distinct from kiln dried jointing sand, which serves a different purpose. Jointing sand is finer, much drier, and used to fill the gaps between laid blocks after installation. It is not suitable as a bedding layer because it cannot compact with the same density or provide the structural support sharp sand offers. Using the wrong sand in either role can lead to uneven settlement and block movement.

Block paving contractors always specify sharp sand for the bedding layer as part of their standard specification. Getting the depth, compaction, and levelness of the sharp sand bed right is crucial to how well a paved surface performs over time. Many paving contractors in Cheltenham stock sharp sand on site or arrange regular delivery to manage jobsite logistics efficiently.