Limestone Dust is a gritty aggregate usually formed from limestone it is easy to work with as it has a variety of uses. It is ideal for achieving that hard-compacted surface layer under artificial grass and block paving. It can also be used to create a fine mortar for flooring screeds. It can be ironed to a tight finish and can also be built up into slopes, so it is often used for benching for manholes. It creates a very hard wearing but smooth surface.