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Pea gravel can be used as a base for a paver patio, but it’s not the preferred choice. Because it is small and round, pea gravel moves much more easily than other base options, like crushed stone, so it won’t keep your pavers in place properly. 

If you do opt for pea gravel, compact it well and use an additional binding agent (like stone dust) to keep everything from shifting.

If pavers are uneven but not sunken, lift the affected bricks and check the bedding sand underneath. In many cases, simply smoothing out or adjusting the sand is enough to level them. Add or remove small amounts as needed, then press the pavers back into place and tap them with a mallet until they sit evenly with the surrounding surface.

If you’re installing pavers over an existing concrete slab, you don’t need to affix the majority of the pavers, but you should use a polyurethane-based adhesive on the border pavers. Polyurethane will expand and contract with temperature changes, which will help keep the pavers firmly in place throughout the year. It’s also strong enough to stand up to foot traffic. You’ll use polymeric sand between the non-border pavers to keep them in place and prevent shifting.

Pavers last longer than both concrete and asphalt when well cared for. Since you can place individual pavers that suffer damage, you won't need to repave the entire driveway for an average of up to 50 years. However, the best material for you comes down to your local climate and budget.