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Three inches is a great thickness for a residential asphalt driveway that sees minimal to moderate traffic from cars, SUVs, and pickup trucks. However, a thicker driveway can better withstand the weight of a heavier vehicle, such as a trailer or a recreational vehicle. If you drive a heavy vehicle on a thin driveway, you risk cracking and damaging it.

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.

It is possible to DIY complete hardscaping projects, but in most cases, hiring a professional is best to get the job done correctly. Hardscaping—including installing patios, decks, retaining walls, walkways, and water features—is challenging and time-consuming, so the money you spend on a professional is typically worth it. Not only will the quality be better, but you could avoid problems that come along with a lack of hardscaping experience, like drainage issues that can lead to costly foundation damage and leaks in your home.

If you're designing a new patio in an area with poor drainage, permeable pavers made from porous materials may help prevent water issues. Most permeable pavers feature a gravel-only aggregate base instead of a concrete base to allow water to flow through instead of getting trapped. While beneficial in some cases, permeable pavers come with higher initial costs and greater load-bearing limitations compared to traditional pavers.