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The fabric is there to prevent weeds from popping up after have the stone patio in place and still allow drainage into the soil below. So do not need nor want it high up against the stones as will prevent the sand from filling in the voids as once the polymer sand is compacted level, it will help hold the stones in place and will not easily run off. The polymer modified sand will harden as it dries which allows it to resists erosion, weed growth and insects...
see > http://www.polymersand.com/why_jointlock.html
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