Yes, but it's best to kill off the grass with solarization and remove the dead plant matter before laying down the pavers. This helps limit the chance of your pavers shifting as the dead plant matter decomposes.

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.

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.

Interlocking pavers offer a number of advantages over regular pavers. For instance, they’re more durable, more resistant to shifting, and easier to repair. There are also permeable options that allow for drainage. However, interlocking pavers are more often more expensive than regular pavers and are prone to growing weeds over time.