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Yes, hardscaping is generally a great investment that can increase your home's value. Hardscape features improve your yard's functionality, safety, and aesthetics, which boosts curb appeal and overall property value. According to a survey by the National Association of Realtors and the National Association of Landscape Professionals, hardscape upgrades are one of the top four outdoor projects that add value to a property for resale, along with landscape upgrades, landscape management, and lawn care services. While most buyers see value in these features, some may be concerned about potential increases in property taxes or the cost to alter them later. However, the return on investment is typically excellent. For best results, hardscaping should be combined with professional landscaping, and it's wise to hire a reliable contractor for installation.

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.

The most obvious disadvantage of permeable paving is that the cost is typically higher compared to non-permeable concrete, pavers, or asphalt methods. Also, the porous material can get clogged with dirt and debris, requiring cleaning and power washing more frequently than standard paving materials and methods. Although permeable paving is not ideal for highways, airports, and other surfaces supporting heavy traffic and machinery, it is suitable for regular residential driveways.

You can pour concrete over asphalt if it’s in good condition, thick, stable, and well-compacted. Concrete is more durable than asphalt and can extend the lifetime of your driveway without having to pay frequent asphalt driveway repair costs or replace it completely. 

But this is best reserved as a temporary solution based on budget restraints, as asphalt requires more frequent repairs and assessments than concrete. Once that concrete top is poured, it’ll be harder to accurately understand what’s happening beneath that layer, which could lead to more issues.