IS CONCRETE BASE GOOD UNDER PAVING STONES or WHEN IS IT NECESSARY?
If you have an existing concrete patio with some cracks in it, you can use it as base and install pavers on it over one inch of sand as long as you have an open clearance under any door or gate that opens on to the patio. You will increase the height of the patio by three inches so the existing grass touching the patio will have to be adjusted if necessary. When installing paving stones around a pool, the ground around a new swimming pool gets excavated almost 3 ft deep and 3 to 4 ft wide all around the pool. It does not matter how long you wait. 3 ft of back fill will keep settling for years and so will be the patio unless a concrete base for the patio is installed the proper way. To do it to prevent settling is to compact the ground as much as possible with a vibrating plate machine, tie rebars to the top of the pool walls on steel walls and drill holes into walls if the walls are poured concrete. Then tie concrete wire mesh at least 4 to 5 ft around pool and then pour 4 inches of co
