The debate between screened and washed gravel has been ongoing in the landscaping and construction industry for years. Each type has its benefits and drawbacks depending on various factors such as use, budget, and location. This article aims to shed light on the subject and help you make an educated choice.
Understanding the Basics: What is Gravel?
Gravel is a term used to describe a wide range of small to medium-sized rocks. These rocks are largely unconsolidated and are used in a variety of ways, ranging from construction to landscaping. The term “gravel” may also refer to a blend of rocks, sand, and fine particles, depending on its application.
The Formation Process of Gravel
Gravel is formed naturally through the weathering and erosion process of larger rocks. Over time, the effects of water, wind, and other natural elements break larger rocks into smaller, unconsolidated pieces. This process can take several thousands to millions of years.
During the formation process, the size and composition of the gravel can vary significantly. Fine gravel consists of smaller particles, while coarse gravel contains larger pieces. Additionally, the types of rocks that make up the gravel can differ, including basalt, sandstone, or limestone.
As the rocks undergo weathering and erosion, they are transported by natural forces such as rivers, glaciers, or wind. These forces carry the gravel over long distances, shaping and sorting them along the way. Eventually, the gravel settles in riverbeds, floodplains, or other suitable locations where it can be extracted for various purposes.
Common Uses of Gravel
In the construction realm, gravel is commonly used in concrete production and to create stable foundations for buildings and roads. Its strong and durable nature makes it an ideal material for these applications. Gravel is also used as a base layer under asphalt or concrete pavements to provide stability and prevent settling.
Gravel’s versatility extends to landscaping, where it serves decorative purposes. It can be used to create visually engaging paths, patios, and in-ground ponds. The different sizes and colors of gravel allow for endless design possibilities, enhancing the aesthetic appeal of outdoor spaces.
Furthermore, gravel finds use in water filtration systems due to its natural ability to trap particles and facilitate the flow of water. It is commonly used in the construction of rain gardens, bioswales, and other sustainable drainage systems. The porous nature of gravel allows water to infiltrate the ground, reducing runoff and promoting groundwater recharge.
Now that we’ve understood the basics of gravel, it’s time to delve into the two different types: screened and washed gravel.
An In-depth Look at Screened Gravel
Screened gravel is a result of mechanical processing. It is produced by passing raw gravel through large screens that divide it into different sizes.
When it comes to construction and landscaping projects, screened gravel is a popular choice due to its versatility and affordability. Let’s take a closer look at the screening process, the benefits it offers, and potential drawbacks to consider.
The Screening Process
The screening process commences by dumping large amounts of raw gravel into a machine equipped with different sized screens. These screens help to classify the gravel, separating it into distinct sizes ranging from larger stones to fine particles.
As the raw gravel travels through the machine, the screens act as filters, allowing only particles of a certain size to pass through. This ensures that the screened gravel is uniform and consistent in size.
After the screening process is complete, the sorted gravel is packed and prepared for distribution. The different sizes of screened gravel are then made available to consumers, catering to various needs and preferences.
Benefits of Screened Gravel
Screened gravel’s primary advantage lies in its versatility. Due to the range of sizes available, it’s possible to custom-fit it for specific uses. For example, larger particles are ideal for drainage solutions, as they allow water to flow freely without causing any blockages. Medium-sized particles are commonly used for driveways or walkways, providing a stable and durable surface. Smaller particles, on the other hand, are perfect for decorative landscaping, adding texture and visual appeal to outdoor spaces.
In addition to its versatility, screened gravel is often preferred over washed gravel due to its lower cost. This makes it an attractive option for large-scale projects or budget-conscious individuals.
Potential Drawbacks of Screened Gravel
While versatile and affordable, screened gravel might contain dust and finer particles due to its processing method. The mechanical screening process can generate some dust, which may result in poor drainage and a muddy appearance, especially in wet conditions.
It’s important to consider these potential drawbacks when deciding to use screened gravel. However, it’s worth noting that these issues can be mitigated by proper installation techniques, such as adding a layer of geotextile fabric to prevent the migration of fines.
Ultimately, screened gravel remains a popular choice for a wide range of applications, thanks to its versatility, cost-effectiveness, and the ability to meet specific project requirements.
Exploring Washed Gravel
On the other hand, washed gravel is gravel that has undergone a washing process to remove dust and finer particles.
The Washing Process
Gravel is run through a machine that sprays it with water while simultaneously moving it around to remove dust and fine particles. The end result is cleaner gravel that allows for better drainage.
Advantages of Washed Gravel
Washed gravel, being dust and particle-free, allows for better drainage making it perfect for systems like French drains, septic drainage fields, and other projects that require high drainage capabilities. Its clean and polished appearance also makes it an ideal choice for landscaping and decoration.
Possible Disadvantages of Washed Gravel
While washed gravel offers several advantages, it’s typically more expensive due to the additional washing process. Also, the lack of finer particles means it may not compact as well as screened gravel, which could be undesirable in certain applications.
Comparing Screened and Washed Gravel
Let’s now explore how screened and washed gravel compare across various factors.
Cost Comparison
When it comes to cost, screened gravel typically comes out on top. The additional washing process usually makes washed gravel more expensive. However, this cost can be justified depending on your application and the aesthetic appeal you desire.
Durability and Maintenance
As far as durability and maintenance are concerned, both types of gravel stand on an equal footing. Both types are robust and can withstand the elements, and maintenance usually involves top-ups, where erosion has occurred, and regular checks for weed growth.
Environmental Impact
Both screened and washed gravel have a low environmental impact. They are natural products, and their extraction and processing produce relatively low emissions. The primary difference lies in water use – washed gravel uses more water in its production than screened gravel.
Ultimately, the choice between screened vs washed gravel will depend on your specific needs, budget, and desired aesthetic. Analyse and weigh the pros and cons of each type before making a final decision.
