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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.

While blacktop is a type of asphalt, the terms should not be used interchangeably, as not all asphalt qualifies as blacktop. The primary differences are in their composition, production process, and ideal applications. Blacktop contains more stone than other types of asphalt and is heated to a higher temperature during production—300°F or more—while hot-mix asphalt is heated to between 275°F and 300°F. The ratio of bitumen (a tar-like crude oil) is a key differentiator, though sources vary: some state blacktop has less bitumen, making it less durable, while others claim it has a higher ratio. Due to these differences, asphalt is generally more durable and better for high-traffic areas like highways and streets, while blacktop is more suitable for playgrounds and residential driveways. For a driveway project, it is best to consult a professional to determine the most appropriate material.

Yes, you should lightly wet the sand with a hose before laying the pavers on top. This activates the bonding agents in the sand, ensuring that your pavers don’t shift around during the installation process. However, you should make sure that the sand is not soaked; overwatering can cause the sand and pavers to not set properly.

Asphalt and tarmac are not the same thing. Traditional tarmac, short for tarmacadam, uses tar as a binder to hold crushed stone together. Asphalt uses bitumen—a byproduct of crude oil—to bind aggregate. Though tarmac was once a go-to for roads, asphalt has become the modern standard. And these days, most surfaces referred to as “tarmac” are actually asphalt. So, while the names may overlap, the key distinction lies in the binder—tar for tarmac and bitumen for asphalt.