The laying course uses Bradstone Bedding Aggregate, a 6mm angular, open graded material. Unlike normal bedding sand, it is free draining and therefore it does not require any control on moisture content. The laying course should be 50mm thick, rather than 30mm for conventional paving and it is not compacted before the blocks are laid. Once laid, and prior to jointing, a light pass over with a whacker plate with a rubber mat is required. The preparation and levelling of the bedding surface is critical as an aggregate bedding layer will not be compacted as with conventional block paving. Laid to a depth of 50mm 1 bulk bag covers 13m2.