Stone dust vs sand for laying pavers? Help! - GardenWebJul 1, 2005 . Use concrete sand and only 3/4" under the pavers. Just make sure the .. Crusher run, on the other hand, drains much better. The smallest.crusher run for drainage under concrete,How to Pack Down Rock Before Pouring Concrete | Home Guides .Whether you pour concrete for a walkway or patio, a strong gravel base is required to . water pooling under the concrete slab and slowly eroding the soil as it finally drains. . If you use a plate compactor, run it over the gravel to pack the material tight. . How to Pour a Slab on Clay Soil · How to Pack Down Crushed Granite.
crusher run for drainage under concrete