The Best Stone for Wall Drainage

River Slicks

• River slicks, or creek rock, are a type of stone that has a smooth, textured finish. They are often found at the bottom of drained-down rivers or near the banks of creeks or lakes. River slicks are often round or near round in shape and vary in sizes. Most are between 6 and 12 inches in diameter and offer great support for a retaining wall or garden wall. They are good stones for drainage as water generally flows over and around them because there are few nooks for water to set and build up. To improve drainage further, gravel or sand can be used to create a wall and hold rocks in place.

Fieldstone

• If you are looking for a sturdy wall to hold back water and moisture, fieldstone is an option. Fieldstone is irregular in size and shape and is often broken and split according to design and landscape needs. Fieldstone can be purchased in your choice of sizes and, in some cases, color. Fieldstone walls are often structured and supported with mortar to assure a waterproof barrier. Fieldstone is resistant to water, so your wall will have to be sloped or tiered to allow for proper drainage. Professional installers may also consider drainage aggregate and a drain tile system to ensure water flows away from the wall and does not cause the wall to shift or lean.

Flagstone

• Flagstone is a common stone for retaining walls. Flagstone is often stacked because of its irregular, but flat, shape. There are oftentimes small gaps between flagstone walls, allowing water to pass through freely. Compact sand or gravel filler will also help with drainage. Having small spaces between the stones will prevent stones from bulging out or shifting due to water buildup and soil pressure.

Rubble

• A rubble stone wall is made from an assortment of rocks and stone. If you live on property where there are several stones in various sizes and shapes, you can use them for a short retaining wall. Because of the varied sizes and shapes, rubble allows for adequate drainage. A rubble wall is a good choice for a vegetable or flower garden border, as excess rain water will resist building up around roots and damaging plants.