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No, paver removal isn't needed to redo polymeric sand in a walkway or patio. Sand can be packed into existing joints as long as you're not dealing with intrusive tree roots or other severe paver problems that require you to pry up your pavers.

The best way to stop your pavers from sinking is to ensure you've properly compacted the base layers. Use your paver compactor and work over the base layer several times to create the hardest possible base. If the soil and sand of your base are compact, you’ll experience less shifting and sinking.

You have a few options if you’re looking for the best material for a steep driveway. Gravel and crushed stone are affordable and provide good traction, while resin helps prevent puddles from forming and can be coated with an anti-slip finish.

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.