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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.

Yes, permeable paving is expensive. For driveways, expect to pay up to $70 per square foot; for patios, permeable paving can cost up to $30 per square foot. Costs will depend on the type of material you choose, plus the standard labor rate in your area.

Maintaining a driveway depends on its material. For concrete and asphalt, it's best to clean the surface thoroughly twice a year with a stiff broom and a pressure washer to remove accumulated dirt and debris. Sealing the driveway is crucial to protect it from water damage and freeze-thaw cycles. Before applying a sealant, pressure wash the surface to remove any loose sealant, dirt, or stains, as sealing over them will trap them. Any cracks or expansion joints should be filled with a flexible polyurethane caulk or asphalt sealer. In colder climates, use sand instead of salt for de-icing. Sand helps melt snow and ice without accelerating the freeze-thaw process, which can cause cracks.

There’s no single best asphalt grade—it all comes down to where and how it’s used. Highways and heavy-traffic roads need something tough, like polymer-modified asphalt (PMA) or Stone Matrix Asphalt (SMA). Local roads and parking lots rely on the Performance Graded (PG) system, chosen based on climate. A PG 64-28 mix, for example, handles a broad temperature range while simpler, more cost-effective mixes are typically enough for residential driveways. The best grade of asphalt depends on traffic, weather, and your budget, which is why a professional’s input is always a smart move before making a decision.