Depends on depth of slab mate, usually well compacted sand is a good base and you can fill joints with fine sand. Some people add some dry cement to the bedding sand and over time the moisture will leave this pretty solid.
Depends on depth of slab mate, usually well compacted sand is a good base and you can fill joints with fine sand. Some people add some dry cement to the bedding sand and over time the moisture will leave this pretty solid.