Drainage- Sand is a good drainer because it is porous and will not shift the pavers even in heavy rain. On the other hand, very fine stone dust will hold water instead of draining it, and this can lead to damage to the paving stone during the freeze and thaw cycles.Click to see full answer. Furthermore, is Stone dust good for drainage?Also called rock dust, stone dust is more prone than sand to settling and drainage problems when used as a base beneath walkway or patio pavers. A proper base material can be compacted easily; however, due to stone dust’s powdery nature, it does not compact as well as other materials.Similarly, does stone dust get hard? Although it is made from the same type of stone as the other two types, it is crushed into a powder. When used by itself stone dust forms a hard surface that is water resistant. Because of its ability to form a strong, non-porous surface, stone dust is often used in between the stones or bricks in patios and walkways. Similarly, you may ask, what happens when stone dust gets wet? In extreme frost-thaw cycles, water-soaked stone dust can actually pump up through the joints, shifting pavers in the process.What does stone dust do?Since stone dust can form a strong, non-porous surface, it not only protects the base of the area from moisture, it also keeps weeds and grass from growing up between the pavers. Stone dust provides an efficient final base layer and these aspects are what make it a great material to go under patios.