Dry Sand Grouting
Dry sand grouting is recommended for pavers with jointing gaps smaller than 5mm in width.
In South Africa, plaster sand is commonly used for dry sand grouting. In the rest of the world you get proprietary packaged, paving jointing sand. In South Africa there are one or two suppliers of these special sands which create the best possible grouting and interlock between pavers.
Sand is swept diagonally into the open joints, and then vibrated to ensure it is settled after which more is swept in until the gaps are filled. Using dry sand is essential as damp sand will clump and stick to pavers which will result in joins not being filled properly. Therefore, pavers also need to be completely dry before the sand can be swept in.
Grouting sand is simple to install and no rigorous cleaning is required after installation. Sand could, however, wash out of joints, and paving joints should be topped up approximately three weeks after installation and annually.
Sand grouting might wash out on steep slopes and around downpipes. Weeds are known to grow in sand joints and this generally requires regular maintenance.