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Do not put concrete under a typical paver patio instillation unless absolutely necessary. Just a uniform,uncompacted 1" setting bed of clean concrete sand over a compacted road base material. Work fine sand into the tight joints between units.

For the thinner, less stable type of larger pavers - "stepping stones", slate, concrete slabs, etc., the requirements may be different to minimize joint/unit heights and cracking of the paving units.

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