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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.

The most common causes of sunken pavers are poor base preparation and insufficient compaction. The problem could also be how your pavers were installed. If the soil beneath your patio or walkway wasn't compacted, it will pull pavers down as it settles. Additionally, using bare soil instead of making a paver bed with compacted gravel and sand can cause sinking over time. To fix sunken pavers, consider recompacting the base and addressing any drainage or erosion issues in the area.

A driveway approach is the part of a driveway where the public road meets the private driveway. This section contains several key elements, including the driveway apron, the curb cut, and the end slope. Depending on the slope of the driveway, this area may also contain the trench drain.

You’ll first need to install a base underneath your pavers for extra stability and drainage. Otherwise, the pavers can sink into the ground, and you’ll have to reinstall them. Use a base gravel layer of 4 to 6 inches for walkways and 10 to 12 inches for driveways. Compact your gravel layer every 2 to 4 inches so it’s nice and solid. After you install your gravel base, apply a 1-inch layer of sand on top.