Decomposed Granite Installation Methods

Decomposed Granite installation Rock N Dirt YardDecomposed granite is a commonly used material for pathways. Its fine sandy texture packs well for pathways and provides a softscape alternative to concrete or other harder surfaces.

Is Decomposed Granite (DG) the best option for pathways? It depends on the application and the amount of maintenance desired. After a recent tour of over 50 residential gardens by a variety of landscape contractors and based on comments from our customers, I have found there are places where DG works and where it does not. There are typically three types of DG installations, natural unbound, stabilizer bound, and resin bound (Polypavement or TerraPave).

Natural Untreated DG:
DG without any binding agent, which is usually compacted with a Vibraplate.
Pros: Looks good and makes great garden paths through plantings and in secondary areas, least expensive DG option.
Cons: Material movement off of paths into planting beds, migration of the material if installed on sloped pathways, moss growth in shady areas, muddiness during the wet season, tracking of the material into the house or onto patio surfaces, needs to be refreshed and maintained periodically to look its best.

Stabilized DG: 
DG with a stabilizer agent to aid in binding the material together.
Pros: Less migration with stabilized material, less costly than Resin bound DG pavement.
Cons: Stabilizer is expensive, gutter runoff and rain may erode the material, has same problems, although often more minor as untreated DG as noted above.

Resin Bound DG:
DG with polymers/resin used to create an asphalt like hard surface
Pros: Solves many of the problems associated with the other two DG types
Cons: Can still erode over time, especially if not compacted with Steamroller (which is often not possible due to access or cost), expensive, texture of surface is more like asphalt and less like DG, which depending on the situation, may be less desirable.

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2 Comments » for Decomposed Granite Installation Methods
  1. mike strong says:

    Is it possible to install decomposed granite on top of asphalt? I have a large asphalt landing that I would like to turn into a decomposed granite patio. Ideally, I would rather not deal with removing the asphalt and install the DG directly on top of the asphalt. This will be a sitting area only and is a flat area. Not sure if the DG will stay because the asphalt is hard and I may not be able to tamp the DG down well enough for it to stay. the area in question is about 2100 square ft.

    • Rocks says:

      Hi Mike,
      That will be fine what you are planning. As long as you have something acting like edging to keep your decomposed granite from washing away, you will be fine. Give us a call if you would like to discuss the details of your project.

      Thanks

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