These materials are suitable

Joint filling materials:

• Joint sand: cheap and easy to work with
• Quartz sand: nice look and easy processing
• Rock flour: good stability and dry filling
• Grout: optimal sealing

Joint sand

Sand has a coarse-grained structure and encourages rainwater to seep away. Lime or crushed sand are recommended and inexpensive products. They are processed in a moist state so that the particles seep into the gaps and solidify better. Joint sand has the disadvantage that wild herbs emerge over time. Because of its poor support properties, the filling material is suitable for large areas that are covered with cobblestones.

Quartz sand

This sand has the advantage that you can keep the joints small. The grain size promotes good infiltration when grouting, which means that the laid stones are more stable. The substrate is often used because of its white appearance. However, it is more likely to get dirty and difficult to clean. The weed growth is not to be underestimated.

Rock flour

This filling material is also known as basalt flour and has a dark appearance. It has properties similar to Quartz sand,(€ 14.90 at Amazon *) the support effect is higher. Unlike sand, it will Rock flour(€ 12.33 at Amazon *) not filled in wet. To minimize the risk of clumping, you should sweep the substrate dry. The disadvantage is a higher price.

Grout

This material is the most expensive filling. To avoid weeds growing, you should use a synthetic resin-based paving joint mortar. Such a product seals the surface so that weed seeds cannot penetrate with their roots. The joints are easy to clean because the filling does not float up. Grout proves to be disadvantageous on large areas because water does not seep away sufficiently. The processing is complex and you have to pay attention to expansion joints when laying the stones.