Granite is the most common igneous rock found in the Earth’s crust. But which granite is better - “crushed or decomposed granite?” Both are used for various purposes and have their own pros and cons. This blog discusses all about crushed and decomposed granite. So, read till the end to make an informed choice of what you should use, why you should use and when you can use it.
What is Crushed Granite?
Crushed granite has a larger and sharper edge, which makes it best for driveways and as a base layer for construction projects.
Pros
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They are affordable and durable.
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They match almost any hardscape design.
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They come in various colors (white, black, green, brown, pink, gold, blue, etc).
Cons
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They are prone to weed growth.
What is Decomposed Granite?
Decomposed granite is formed due to granite weathering and is relatively affordable. They are available in different sizes and colors and are used in various landscaping projects. Here are some pros and cons of DG (decomposed granite) -
Pros
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DGs are highly permeable and handle water runoffs easily.
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They are stable, and once compacted well, they offer a clean and stable surface.
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They are available in assorted natural colors, which provides a rustic appeal to the landscape.
Cons
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Decomposed granite sticks to the shoes, so avoid putting them in front of your home.
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They need regular maintenance like concrete and need to be always redressed and recompacted.
Difference Between Crushed Granite Vs. Decomposed Granite
Crushed granite comes in sizes ranging from ¼ inch to 1 inch. Whereas decomposed granite consists of rock fragments, which are smaller than standard gravel. Decomposed granite consists of fines, which makes it easy to install and compact the surface. Thus making it stay in place. Fines are smaller than decomposed granite; they are the tiniest of all and almost down to dust.
To make the surface more durable, decomposed granite is usually combined with stabilizers or polymers. When resin is added, it becomes somewhat like asphalt but also retains the natural appearance of stone. Since there are various options available, you can always consult with a supplier to determine the best fit for your specific project.
Crushed granite is mostly used and best suited for driveways, offering a bold, open look that many homeowners find visually appealing. On the other hand, decomposed granite and fines are mostly preferred for garden mulch and walkways. The main advantage of using decomposed granite as mulch is - it can deter pests. The best way to use decomposed granite is to place it in front of the main door as a doormat. It traps abrasive and small particles and prevents them from entering your home.
Why Choose Crushed Granite?
Here are some reasons why crushed granite is so much in demand -
Growth in Population
Crushed granite is more durable than decomposed granite and is required to set foundations for infrastructures. Also, sports courts, parking lots, and commercial spaces need crushed granite for proper roadways and drainage to support their daily operations.
Expansion of Industrial Infrastructures
The increase in industries and businesses, modern offices, buildings, and retail spaces require a strong foundation. Hence, crushed granite is considered important in such projects, as it offers the kind of stability and durability these infrastructures require.
Upgradation of Public Projects
Public infrastructures, such as bridges, roads, and green spaces, need to be upgraded regularly. Hence, they require solid and durable construction materials. This is because bridges need to support thousands of cars and heavy-duty vehicles daily. Hence, crushed granite offers reliability.
What to Use Decomposed Granite for?
Here’s what you can use decomposed granite for -
Pathways and Walkways
Decomposed granite is the best material to create walkways and pathways. This is because of its natural look that complements the surrounding trees, flowers, shrubs, etc. Also, it is permeable, which prevents water pooling. However, when installing decomposed granite, ensure it creates a solid surface that can handle daily foot traffic. For better durability, consider a depth of 2-3 inches.
Driveways and Parking Areas
Decomposed granite is the perfect alternative to concrete or asphalt. They are cost-effective and environmentally friendly, too. DG can be compacted to create a solid surface to support vehicles and allow natural drainage. If you need a smoother finish and reduce the risk of erosion, consider choosing a finer grade of DG.
Garden Beds and Landscaping
Decomposed granite is also used as a decorative cover for garden beds. It enriches the garden with its natural color and enhances the beauty of the flower beds. Also, its ability to retain moisture makes it beneficial for plant health. You can also use it as a mulch alternative, which suppresses the weeds and reduces the need for chemical herbicides.
Controls Erosion
If you live in an erosion-prone area, decomposed granite can be of great help. It allows the water to permeate, which reduces erosion. DG also stabilizes the soil and prevents washouts. When you use it in addition to native plants, it minimizes erosion and enhances biodiversity.
Conclusion
Based on their composition, crushed and decomposed granite are used for different applications. Crushed granite is known for durability and is used for driveways and walkways. Whereas decomposed granite is mostly used for aesthetic purposes, such as landscaping purposes. So, when you select one, consider the purpose and your requirements.
