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Yes, interlocking pavers need sand both as a base and as a finishing touch to fill any gaps. Sand helps keep your pavers in place to avoid shifting, especially for areas with high foot or vehicle traffic. It also helps prevent water buildup by providing a channel for water drainage.

The layer of polymeric sand under the pavers plus the polymeric sand that gets swept into the joints between your pavers holds them in place in a few ways. For one, the gritty texture of the sand helps lock the pavers together. Polymeric sand also contains bonding agents that get activated by water. Polymeric sand will take between 24 and 48 hours to fully cure, so do not walk on your paver walkway before this time.

Driveways last 25 to 50 years, but you’ll notice cracks and possible missing pieces during this time. Regular maintenance, such as filling cracks, reapplying sealer, and ensuring that water does not erode the base material, can help extend the lifespan of your driveway. Gravel driveways should be regraded to fill in uneven areas every year or two, depending on how frequently it is needed.

Professional installers often include a deep layer of crushed gravel under permeable pavers to allow more runoff to soak through into the soil below. Many installations will include multiple layers of gravel, with coarser aggregate at the base and finer aggregate that sits on top of that bottom layer. Above the gravel, you’ll often find coarse sand that helps reduce paver shifting over time. Some permeable paver designs include a water collection system set into the gravel layer to route runoff to a safe area for disposal.