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Why the Paver Bed Is Exactly 1 Inch

Every paver manufacturer and the ICPI (the paver industry body) specify a bedding layer of exactly 1 inch of concrete sand, and the number is not arbitrary. A bed thinner than 1 inch cannot absorb the small height differences between individual pavers, so some stones end up rocking on high spots in the gravel. A bed thicker than 1 inch does the opposite damage: the loose sand shifts under load, pavers settle unevenly, edges dip, and joints open up within a season or two. The 1 inch of sand is a leveling layer, not a structural one. The real strength of a patio comes from the 4 to 6 inches of compacted gravel beneath it. For a 10x10 patio, that structure works out to about 0.31 cubic yards of sand (17 bags of 50 lb) over 1.2 to 1.9 cubic yards of gravel.

Washed vs Unwashed Sand

Washed sand has been rinsed to remove silt, clay, and dust, leaving clean grains that drain freely and behave predictably. Unwashed sand still carries those fine particles, which hold water, stain pavers, and can make a bedding layer turn to sludge in wet weather. Concrete sand, mason sand, and play sand are all sold washed, which is one reason they cost a little more than raw fill sand. For paver work, always buy washed concrete sand: the angular, washed grains lock together under the pavers and drain rainwater down into the gravel base instead of puddling. Fill sand and unwashed bank sand belong in trenches and holes, never under a patio you want to stay level.

Compaction: What to Compact and What to Leave Alone

Compaction is where paver projects succeed or fail, and the rule surprises most first-timers: compact the gravel, never the sand. The gravel base should be compacted in layers of about 2 inches at a time with a plate compactor until it reaches 4 to 6 inches total, because that base carries the load. The 1-inch sand bed, by contrast, is screeded smooth and left loose: walking on it or running a compactor over it before laying pavers creates footprints and low spots that telegraph straight through to the finished surface. Compaction of the whole system happens at the end, when a plate compactor runs over the laid pavers and vibrates them about 1/4 inch down into the sand, locking sand up into the joints from below. Sweep polymeric sand into the joints after that pass, mist it with water, and the patio is locked solid.