Can I Cover a Concrete Driveway With Stone?

Preparation

• Paving over an existing driveway is a two-part process that entails preparing the surface and then setting the stones. It’s essential to scrub the concrete free of debris and grime, or these organic materials will weaken the bond between the concrete and mortar. Patch any cracks or pits with a vinyl patch compound to provide a smooth, even surface for setting the stones.

Application

• Mortar begins to harden shortly after it is spread, so it’s important to know exactly how you want to lay the stones in advance. Dry-lay the stones on the concrete to familiarize yourself with the pattern, and note if the stones vary in thickness. Begin at one end of the driveway and spread 1/4 inch of mortar over a surface large enough for three stones. Spread a 1/4 inch of mortar over the bottom of the stone with a notched trowel. Press the stones into the mortar so it squeezes up around the sides, and make every stone level with the previous stone before moving on to the next.

Maintenance

• If you use irregularly-shaped, snapped stones like flagstones, fill the spaces in between the stones with grout to block debris from building up in the joints. For stone pavers with narrower joints, use polymeric sand. Once the mortar has set for a few days, seal the entire driveway to prevent the stones from eroding and protect the joints. Plan to replenish sand joints and re-seal the surface every few years based on the traffic and weather the driveway endures.

Considerations

• Laying stones over existing concrete is convenient, but it has a few drawbacks. It raises the surface by several inches, depending on the depth of the stones used. This throws off the alignment between the driveway, garage and any connecting walkways. One solution is to spread a simple concrete ramp from the driveway to the walkway so people won’t trip. Build up the sides of the driveway with a line of vibrant, low-growing plants like geraniums to add color and tie the new driveway into the rest of the landscape.