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You should place a layer of thick landscaping fabric directly over the concrete slab and then a thin layer of leveling sand over that to protect the pavers from moisture. For border pavers, you should plan on locking them in place with polyurethane adhesive. This will prevent them from shifting under foot traffic.

After removing existing moss, consider using paver blocking sand to fill the joints. This specialty material hardens once placed and serves as an effective barrier against moss and weeds. From there on, regularly clean your pavers and try to keep them dry. You can also seal your paver as a semi-permanent solution — just make sure you reseal every 3 to 5 years.

To adhere pavers to concrete, you can use either mortar or a concrete-specific adhesive. For border pavers, a polyurethane-based adhesive is a good choice as it expands and contracts with temperature changes, keeping them firmly in place. For the non-border pavers, polymeric sand is used between the joints to prevent shifting. In most cases, it is also recommended to lay a permeable sand layer below the pavers to ensure proper stability and drainage. Before starting, always take the proper preparatory steps for a professional result.

Paving is a part of hardscaping, so all paving is hardscaping, but not all hardscaping is paving. Paving involves laying down concrete or asphalt, while hardscaping can also include the use of paving stones, bricks, gravel, wood, and more. Hardscape features that involve paving are considered permanent and will increase your property taxes, while some other hardscaping features—like those involving bricks, gravel, and paving stones—will not affect property taxes. Paving also typically requires a permit, while hardscaping features considered temporary will not.