Retaining Wall Drainage Gravel Size

For proper drainage the first 12 inches of space behind a retaining wall should be filled with crushed stone or gravel.

Retaining wall drainage gravel size.

Gravel is necessary for many landscape projects and not just beautiful rock gardens. 3 4 there are two options at this size clean and dga. A wall that leans into the soil it retains is less likely to be pushed outward by soil pressure than a plain old vertical wall. A retaining wall is intended to hold back soil when there is a drastic change in elevation.

We go about 6 8 deep behind the wall with loose rock usually crushed. Refer to the diagram of a typical retaining wall drainage system presented here. One thing to avoid at all costs is lining the back of the retaining wall with plastic. 5 8 this is also commonly used to mix with asphalt or concrete.

Design and build your retaining wall to slope at a minimum rate of. When you re doing a diy landscape project it s important to choose the right type of gravel. A retaining wall must have the strength to hold back the weight of the soil plants and sometimes small structures behind it. This is so that when water gets into the space it does not become bogged down in soil but instead can flow down the wall to the drains or weep holes.

4 tips to building the best retaining wall use crushed stone behind the wall. Gravel labeled 411 is usually a mixture of 57 and stone dust and is particularly useful for patching potholes and sealing things like retaining walls. 3 4 clean is used for drainage behind walls and is also used as fill and for drainage projects such as french drains. Soil holds water so the dirt will expand and contract during winter thus pushing on the wall and eventually toppling it over.

The wall gets its. It is also used for drainage or as driveway gravel. Typically this gravel ranges in diameter from 2 5 inches 6 35 centimeters to 4 inches 10 16 centimeters. The quantity of drainage gravel used will vary depending on the height of the wall and the amount of water runoff expected but as a general rule the more gravel used the better.

Gravel known as size 1 is relatively large. Retaining walls and other features that require drainage make great use of large gravel to allow water to drain away faster than soil would.