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Decomposed granite (DG) has gained popularity in landscaping and construction due to its aesthetic appeal and functional properties. However, a common question arises among homeowners and contractors alike: does decomposed granite settle? This inquiry is crucial for anyone considering DG for pathways, driveways, or garden beds, as settling can affect both the appearance and functionality of the surface. In this post, we will delve into the characteristics of decomposed granite, the factors influencing its settling behavior, and best practices for installation to minimize settling issues.

What is Decomposed Granite?

Decomposed granite is a natural stone material that results from the weathering and disintegration of granite rock. It is typically available in two forms: natural and stabilized. Natural decomposed granite consists of loose particles that can vary in size, while stabilized decomposed granite is mixed with a binding agent, such as resin or polymer, to enhance its durability and reduce dust.

The Settling Process of Decomposed Granite

When we talk about settling in the context of decomposed granite, we refer to the gradual compaction and displacement of the material over time. Several factors contribute to this process:

1. Particle Size and Composition: The size of the DG particles plays a significant role in how well they compact. Finer particles tend to fill gaps between larger ones, leading to a denser and more stable surface. Conversely, a mix with larger particles may create voids that can lead to settling.

2. Moisture Content: Water is a critical factor in the settling of decomposed granite. When DG is wet, it becomes more malleable, allowing for better compaction. However, excessive moisture can lead to erosion and displacement, particularly in areas with poor drainage.

3. Traffic Load: The weight and frequency of traffic over a DG surface can accelerate settling. High traffic areas are more prone to compaction and displacement, especially if the underlying base is not adequately prepared.

4. Installation Techniques: Proper installation is vital to minimize settling. Techniques such as layering, compacting, and using a stabilizing agent can significantly enhance the longevity and stability of a DG surface.

Best Practices to Minimize Settling

To ensure that your decomposed granite surface remains stable and visually appealing, consider the following best practices during installation:

1. Prepare the Base: A well-prepared base is essential. Excavate the area to a depth of at least 4-6 inches and ensure proper drainage. A compacted base of crushed stone or gravel can provide a solid foundation for the DG.

2. Choose the Right Type of DG: Depending on your project, select either natural or stabilized decomposed granite. For high-traffic areas, stabilized DG is often recommended due to its enhanced durability.

3. Moisture Management: Before installation, lightly moisten the DG to facilitate compaction. After installation, avoid excessive watering, which can lead to erosion. Instead, consider using a dust control product to maintain moisture levels.

4. Regular Maintenance: Periodic maintenance, such as re-compacting the surface and filling in any low spots, can help mitigate settling over time. Additionally, applying a stabilizing agent can prolong the life of the DG surface.

Conclusion

In summary, while decomposed granite does settle over time, understanding the factors that contribute to this process can help you take proactive measures to minimize its impact. By focusing on proper installation techniques, moisture management, and regular maintenance, you can enjoy the beauty and functionality of decomposed granite in your landscaping projects for years to come. Whether you are a homeowner or a contractor, being informed about the settling behavior of DG will empower you to make better decisions and achieve lasting results.

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