The dream of a perfectly manicured lawn, green year-round without the fuss of mowing, watering, and fertilizing, is a common one. Artificial grass offers an attractive solution, but the question often arises: Can you simply lay it on top of your existing, natural grass? The answer is a nuanced one, and this article will delve into the pros, cons, and essential steps involved in making the right decision for your lawn.
Understanding the Basics: Artificial Grass and Natural Turf
Before we dive into the specifics of laying artificial grass on old grass, it’s crucial to understand what we’re working with. Artificial grass, also known as synthetic turf, is a man-made surface designed to mimic the look and feel of natural grass. It’s typically made from synthetic fibers like polyethylene, polypropylene, or nylon, and is often used in sports arenas, residential lawns, and commercial landscaping.
Natural grass, on the other hand, is a living, breathing organism that requires specific conditions to thrive. It needs sunlight, water, nutrients, and regular maintenance to stay healthy and green. Different types of natural grass have different requirements, adding another layer of complexity.
The Short Answer: Is it Possible?
Yes, it is possible to lay artificial grass directly on top of existing natural grass. However, doing so without proper preparation is strongly discouraged and will likely lead to significant problems down the line. Think of it like building a house on a shaky foundation.
Why Simply Laying Artificial Grass on Old Grass is a Bad Idea
There are several compelling reasons why you should avoid directly installing artificial grass over existing natural grass without proper preparation. Ignoring these potential problems can lead to costly repairs and a less-than-ideal artificial lawn.
Decomposition and Drainage Issues
One of the biggest problems is the decomposition of the natural grass underneath. As the natural grass dies and decomposes, it creates a breeding ground for bacteria and fungi. This can lead to unpleasant odors, especially in warm and humid climates.
Furthermore, decomposing organic matter retains moisture. This can impede drainage, leading to a soggy and unstable base for your artificial grass. Poor drainage can also contribute to the growth of mold and mildew, further exacerbating odor problems and potentially damaging the artificial turf itself.
Uneven Surface and Instability
Natural grass rarely grows perfectly evenly. Existing bumps, dips, and variations in the turf’s surface will be amplified when covered with artificial grass. This can result in an uneven and unsightly appearance, making the artificial lawn feel less stable and comfortable to walk on. The underlying decomposing matter can also cause the surface to shift and settle unevenly over time.
Weed Growth
While artificial grass is designed to be weed-resistant, it is not entirely weed-proof. Weeds can still grow through the drainage holes or along the edges of the artificial turf, especially if the underlying soil is not properly treated. The decomposing natural grass provides a fertile environment for weed seeds to germinate, increasing the likelihood of weed problems.
Pest Infestation
The moist, decomposing environment beneath the artificial grass can also attract pests like insects, rodents, and other unwanted critters. These pests can damage the artificial turf, create unsanitary conditions, and even pose a health risk.
Reduced Lifespan of Artificial Grass
All of the above factors contribute to a reduced lifespan for your artificial grass. The unstable base, poor drainage, and pest infestations can cause the artificial turf to degrade prematurely, requiring you to replace it sooner than expected. This negates the long-term cost savings that artificial grass is supposed to provide.
The Correct Approach: Preparing the Ground for Artificial Grass
The key to a successful artificial grass installation is proper ground preparation. This involves removing the existing natural grass, creating a stable base, and ensuring adequate drainage. While it requires more effort upfront, it will save you time, money, and frustration in the long run.
Step 1: Removing the Existing Natural Grass
The first step is to completely remove the existing natural grass. This can be done manually using a sod cutter or by applying a non-selective herbicide to kill the grass and then removing the dead turf. A sod cutter is often the preferred method, as it removes the grass and its roots in one go. When using herbicide, always follow the manufacturer’s instructions carefully.
Step 2: Excavation and Leveling
Once the grass is removed, excavate the area to a depth of approximately 3-4 inches. This will create space for the base layer. Level the ground using a rake and a compactor. A level surface is crucial for ensuring a smooth and even artificial lawn. Pay attention to the desired slope for drainage.
Step 3: Installing a Weed Barrier
To prevent weeds from growing up through the artificial grass, install a high-quality weed barrier fabric over the excavated area. Overlap the edges of the fabric and secure it with landscaping staples. This barrier will block sunlight and prevent weed seeds from germinating.
Step 4: Creating a Base Layer
The base layer is essential for providing a stable and well-drained foundation for the artificial grass. The most common material used for the base layer is crushed aggregate, such as gravel or decomposed granite. Spread the aggregate evenly over the weed barrier to a depth of 2-3 inches.
Step 5: Compacting the Base Layer
Use a plate compactor to thoroughly compact the base layer. This will create a solid and stable foundation that will prevent the artificial grass from sinking or shifting over time. Proper compaction is critical for ensuring the longevity and performance of your artificial lawn.
Step 6: Adding a Sand Layer (Optional)
In some cases, a thin layer of sand is added on top of the compacted base layer. This sand layer helps to create an even smoother surface and provides additional drainage. If using sand, be sure to use a fine, silica-based sand that is specifically designed for artificial grass installations.
Step 7: Installing the Artificial Grass
Now you’re ready to install the artificial grass. Roll out the artificial turf and position it carefully, ensuring that the seams are aligned correctly. Use a utility knife to trim the edges of the artificial grass to fit the desired area.
Step 8: Securing the Artificial Grass
Secure the artificial grass to the base layer using landscaping staples or adhesive. Space the staples or adhesive evenly along the edges of the artificial turf and around any seams. This will prevent the artificial grass from shifting or lifting in windy conditions.
Step 9: Infilling (If Applicable)
Some types of artificial grass require infill, which is typically sand or crumb rubber. Infill helps to support the blades of grass, provide cushioning, and improve drainage. If your artificial grass requires infill, distribute it evenly over the surface using a spreader and then brush it into the fibers.
Step 10: Grooming and Maintenance
Once the artificial grass is installed, groom it with a stiff brush to help the blades stand up and look more natural. Regularly brush the artificial grass to remove debris and prevent matting. Rinse the artificial grass with water periodically to remove dirt and dust.
When Can You Consider a Simplified Approach?
While complete removal is generally recommended, there are a few specific scenarios where a slightly simplified approach might be considered. However, these situations require careful evaluation and are not without risk.
Very Thin, Weak Grass
If the existing natural grass is extremely thin, sparse, and weak, with minimal root structure, it might be possible to kill it with a strong herbicide and then compact it into the soil. This essentially creates a very thin layer of dead organic matter. However, even in this scenario, drainage is still a major concern.
Small, Well-Drained Areas
For very small areas that are known to have excellent drainage, the risks of decomposition and drainage problems are somewhat reduced. However, thorough preparation is still essential.
Professional Consultation is Key
Even in these limited scenarios, it is absolutely crucial to consult with a qualified artificial grass installer. They can assess the specific conditions of your lawn and provide expert advice on the best course of action. A professional will be able to identify potential problems that you might miss and recommend solutions to ensure a successful installation.
The Benefits of Proper Preparation
Investing the time and effort in proper ground preparation offers numerous benefits:
- Longer Lifespan: A stable base and proper drainage significantly extend the lifespan of your artificial grass.
- Improved Appearance: A level and well-maintained surface ensures a natural and aesthetically pleasing look.
- Reduced Maintenance: Proper preparation minimizes weed growth, pest infestations, and other common problems, reducing the need for maintenance.
- Enhanced Drainage: Adequate drainage prevents waterlogging and ensures that your artificial lawn remains dry and comfortable.
- Increased Value: A well-installed artificial lawn can increase the value of your property.
- Prevents Unpleasant Odors: Removing organic matter prevents decay and unpleasant odors.
Cost Considerations
While proper ground preparation adds to the initial cost of installing artificial grass, it is a worthwhile investment in the long run. The cost of removing the existing grass, excavating the area, installing a base layer, and compacting the soil will vary depending on the size of your lawn and the complexity of the job. However, it is important to factor in the potential costs of repairing or replacing poorly installed artificial grass, which can be significantly higher.
DIY vs. Professional Installation
Installing artificial grass is a project that can be tackled by experienced DIYers, but it requires significant time, effort, and attention to detail. Proper ground preparation is the most critical aspect of the installation, and it is essential to follow the steps outlined above carefully. If you are not comfortable with excavation, leveling, and compaction, it is best to hire a professional installer.
Professional installers have the experience, equipment, and expertise to ensure that your artificial grass is installed correctly and that it will last for many years to come. They can also provide valuable advice on choosing the right type of artificial grass for your needs and budget.
Choosing the Right Artificial Grass
With so many different types of artificial grass available, it can be difficult to choose the right one for your needs. Consider factors such as the intended use of the lawn, the amount of foot traffic it will receive, and your personal preferences. Look for artificial grass that is durable, UV-resistant, and has good drainage. Also, consider the pile height and density of the grass, as these factors will affect its appearance and feel.
Conclusion: Invest in the Foundation
While it might be tempting to cut corners and simply lay artificial grass on top of your existing natural grass, doing so is almost always a mistake. The potential problems of decomposition, drainage issues, uneven surfaces, weed growth, and pest infestations far outweigh any perceived savings in time or money. Proper ground preparation is the key to a successful and long-lasting artificial grass installation. By investing in the foundation, you can enjoy a beautiful, low-maintenance lawn for many years to come. Remember to consult with a qualified professional if you have any questions or concerns about the installation process. They can provide expert advice and ensure that your artificial grass is installed correctly.
FAQ 1: Is it actually possible to install artificial grass directly over existing grass?
It is technically possible to lay artificial grass directly over existing grass, but it’s generally not recommended and can lead to significant problems down the line. The decaying organic matter from the old grass creates an unstable base, prone to unevenness, drainage issues, and weed growth. This can compromise the longevity and aesthetic appeal of your artificial lawn.
Failing to properly prepare the base will significantly reduce the lifespan of your artificial grass and necessitate premature repairs or even a complete replacement. The old grass will decompose, creating pockets and dips, and the lack of a proper sub-base will hinder drainage, leading to waterlogged patches and potential mold or mildew growth. This can ultimately cost you more money and effort in the long run.
FAQ 2: What are the potential problems associated with laying artificial grass on top of real grass?
One of the primary concerns is drainage. Existing grass and soil retain moisture, and covering them with artificial turf without proper drainage can lead to water accumulation, creating a breeding ground for mold, mildew, and unpleasant odors. The trapped moisture can also cause the artificial grass to lift and become uneven over time.
Weed growth is another significant issue. Even if you kill the existing grass beforehand, weed seeds can still germinate beneath the artificial turf. Without a proper weed barrier and a compacted sub-base, weeds will eventually find their way through the artificial grass, compromising its appearance and requiring ongoing maintenance.
FAQ 3: What site preparation is required for artificial grass installation?
Proper site preparation is crucial for a successful artificial grass installation. This typically involves removing the existing grass and any loose soil, followed by leveling the area. A layer of compacted sub-base material, such as crushed stone or aggregate, is then added to provide a stable and well-draining foundation.
Following the sub-base, a weed barrier membrane is essential to prevent weed growth from underneath. This membrane should be laid carefully to ensure complete coverage of the prepared area. Finally, a layer of sand or infill is often applied on top of the artificial grass to help weigh it down, protect the fibers, and provide a more natural feel.
FAQ 4: What are the benefits of removing the existing grass before installing artificial turf?
Removing the existing grass allows for the creation of a stable and level sub-base. This ensures proper drainage, preventing water accumulation and the growth of mold and mildew. A solid foundation also prevents the artificial grass from becoming uneven or sinking over time, extending its lifespan and maintaining its aesthetic appeal.
Removing the existing grass also allows for the effective installation of a weed barrier. This prevents weeds from growing through the artificial turf, minimizing maintenance and keeping your lawn looking pristine. A well-prepared base, free from organic matter, creates an optimal environment for a long-lasting and beautiful artificial lawn.
FAQ 5: Are there any specific situations where laying artificial grass on top of real grass might be acceptable?
In very specific and limited circumstances, such as temporary installations or low-traffic areas, laying artificial grass directly on top of real grass might be considered. This is only advisable if the existing grass is extremely short, level, and well-draining, and if the artificial grass is only intended for short-term use.
However, even in these scenarios, the potential for drainage issues, weed growth, and unevenness should be carefully considered. It is crucial to thoroughly assess the risks and understand that this method is not a long-term solution and may require more frequent maintenance and potential replacement compared to a professionally installed system with proper base preparation.
FAQ 6: What type of base is best for artificial grass?
The ideal base for artificial grass typically consists of a layer of well-compacted crushed stone or aggregate, such as Class 5 road base. This material provides a stable, level, and well-draining foundation that is essential for the longevity and performance of the artificial turf.
The depth of the base layer will vary depending on the soil conditions and intended use of the artificial grass area, but generally, a minimum of 4 inches is recommended. Proper compaction of the base material is crucial to prevent settling and ensure a smooth, even surface for the artificial grass.
FAQ 7: What steps can I take to improve drainage if I choose not to remove the existing grass?
While not recommended, if you insist on laying artificial grass over existing grass, improving drainage is crucial. This can be attempted by heavily aerating the existing grass and soil before installation to create channels for water to escape. Perforated drainage pipes can also be installed beneath the artificial grass to redirect water away from the area.
However, these measures are unlikely to be as effective as a proper sub-base and may only provide temporary relief from drainage issues. The decaying organic matter will continue to impede drainage over time, and the lack of a proper compacted base will still contribute to unevenness and potential problems. Therefore, professional installation with proper base preparation is always the best long-term solution.