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Brick patio redo

What do I have to do to the subbase if I take up an existing brick patio and raise it about 5 inches. Would i have to dig out all the stone dust and sand and start over or can I put more stone dust on top of the sand, and then sand and then lay the bricks? Worried that the existing layer of sand might cause problems mixed in with the stone dust. And/or should i use a more rock base? What size?:confused:

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