What’s decomposed granite?

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Decomposed granite, sometimes referred to as DG, is most commonly recognized as a building and landscaping material. It is popular in the construction of paths, parking areas and roads, as well as in the landscaping of the courtyard. Decomposed granite consists of weathered granite particles ranging from gravel to silt size and usually include some clay. The name decomposed granite refers to the fact that the particles are the result of the natural erosion, or decomposition, of the granite rock.

One of the most common places to find DG is in hiking trails. The material is quite stable when compressed, yet remains a permeable material, allowing for satisfactory drainage. In addition to paths, decomposed granite is commonly used to construct driveways and parking areas. Decomposed granite is also sometimes used in road construction, although it must be compacted to form a stable driving surface.

Decomposed granite is popular in landscaping as a hardscape material. It can be used as a ground cover, mulch, patio base or to create paths. Decomposed granite is a fairly environmentally friendly choice because it’s a natural product, is permeable, and provides a hardscape that doesn’t require water. After the granite is in place, it will continue to weather the elements, which adds beneficial nutrients to the surrounding soil and plants. Unsurprisingly, decomposed granite is an especially popular landscaping choice in arid regions.

Depending on the climate and intended use, DG can be used on its own with moderate compression to keep it in place, or it can be set up with stabilizers. If granite is laid out on its own, it is usually contained with some sort of border or framework to prevent the granite from being easily washed away. Conversely, if decomposed granite is secured with stabilizers or resins, the hardscape will be more permanent and stable, but permeability will be reduced, making drainage an important consideration.

Decomposed granite usually refers only to granite that has weathered naturally, however, it is often referred to interchangeably with crushed gravel and crushed stone. Each of these products has angular pieces and usually a percentage of fine pieces. They are often used for similar types of construction or landscaping processes.

The formation of decaying granite occurs over time, and is the natural result of weathering and weathering of granite rocks. Wind and water physically and chemically alter the granite, eventually fracturing the small pieces that make up the decomposed granite. The final product is quarried in granite quarries, usually together with other granite products such as large boulders, slabs and crushed granite.

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