Illustrated cross-section comparing a paver patio edge built with a proper troweled concrete edge restraint against an unrestrained edge where pavers have spread, tilted and lost joint sand, with callouts for bedding sand, joint sand width and base compaction
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Why Paver Patios Shift: Edge Restraint, Joint Sand and Drainage

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The real causes behind a shifting, gapping or sinking paver patio: missing or misbuilt edge restraint, wrong bedding sand or base compaction, and joint sand washed out by concentrated drainage — per ICPI’s own construction standards.