Why should I use sand for the setting bed and sweeping into the joints between the paving stones?
The sand used for the setting bed should always be of a course sand type. Concrete sand is the optimum type and gradation for this part of the project. This is a national uniform specification set forth by the Interlocking Concrete Paving Institute (ICPI). Some people like to use stone dust, and in some areas, stone dust can be an effective setting bed. The reason stone dust is not recommended is because it will not allow for drainage under the paving stone. It is also harder to get the paving stones to “seat” properly in a setting bed of stone dust.
