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Limestone screenings is all we use around here. There maybe different grades of quality in different areas but here the screenings or stone dust are incredible. If you leave a 1/8" or 1/4" layer of soft screenings on top of your grade and tamp your pavers into this they will all tamp level. By spreading a layer of poly sand on top of the pavers and running th tamp over this the sand will fill the full gap top to bottom and lock the paversd in place. If the screenings are wet underneath there is a problem not with the screenings but with the grade. If there is a proper grade water should run off the pavers and not leach down to the screening base.
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