
Installing the right sub base for artificial grass is crucial for a long-lasting lawn. A sub base with a depth of at least 50mm is recommended to provide a stable foundation.
The type of sub base material you choose will also impact the longevity of your artificial grass. Compacted aggregate is a popular choice, but crushed stone can also be effective.
A well-drained sub base is essential to prevent water from accumulating and causing damage to the artificial grass. This can be achieved by incorporating a layer of permeable aggregate, such as sand or gravel.
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Preparation and Planning
To ensure a successful installation of artificial grass, preparation and planning are crucial steps. You'll want to start by measuring the area to determine the amount of material needed.
Measuring the area correctly will save you from having to make multiple trips to the store for more materials. Check for drainage patterns and ensure the surface will allow water to drain away, as a poorly draining surface can lead to a host of problems.
A typical excavation depth for general landscaping is 3 to 4 inches, so keep that in mind when planning your installation. This will also help prevent pests like gophers and moles from ruining your installation by giving you a solid base to work with.
A properly compacted sub base is essential to prevent weeds from flourishing and to ensure a smooth, even surface. By following these simple steps, you'll be well on your way to a successful artificial grass installation.
Groundwork and Subbase
When installing artificial grass, a solid subbase is crucial for stability and drainage. A compacted soil base is an affordable option, but it may not provide the same stability and drainage as other base materials.
To compact soil, rent a gas-powered compactor or use a mechanical compactor or hand tamper to ensure a solid base. The key is to create a firm, flat surface.
A crushed stone or gravel base is the most common and recommended base for artificial turf. This base allows water to easily drain through the artificial grass carpet and prevents pooling or puddling on the surface.
A layer of crushed stone or gravel 1-2 inches deep provides the ideal amount of stability and drainage. The rock base also provides a firm, smooth foundation for the fake grass to lay on top of.
Sand is another viable base material under fake grass, but it can erode or shift over time if not contained properly. Sharp, coarse builders sand approximately 1-2 inches deep works best.
Before laying artificial grass, remove the natural grass and 2-3 inches of soil. Then, apply a heavy layer of weed killer before laying the base layer of either Class II Road Base or Decomposed Granite.
To ensure a dense and strong foundation, double compaction of the base layer is recommended. This involves compacting the base layer twice to achieve maximum density.
Here are some base material options to consider:
Installation and Lay
To prepare the sub-base layer, you'll need to remove the existing soil and apply a weed killer to the surface. This is a crucial step to prevent weeds from growing through the artificial grass.
For DIY installers, using decomposed granite (DG) as an alternative to road base is a cost-effective option. Spread about 2" of DG evenly with a push broom along the surface, then compact the surface with a heavy-duty roller in multiple directions.
To ensure your base won't wash away with rainfall, apply a stabilizer on the DG after compaction. This will provide a sturdy enough base to hold the nails when securing the artificial turf down.
You can also consider adding a thin layer of Zeolite on top of the granite, especially if you have dogs. This natural volcanic mineral absorbs odours and reduces heat on the lawn.
Here's a summary of the base preparation steps:
- Remove existing soil and apply weed killer
- Spread 2" of decomposed granite (DG) evenly with a push broom
- Compact the surface with a heavy-duty roller
- Apply a stabilizer on the DG after compaction
- (Optional) Add a thin layer of Zeolite on top of the granite
By following these steps, you'll be able to create a stable and level sub-base for your artificial grass installation.
Best Lay Option
The best lay option for artificial grass is a solid foundation, and that's exactly what Class II Road Base provides. This material is used in most professional installations because it's incredibly stable.
You can also use decomposed granite and a stabilizer for the base layer, but it's not as solid as Road Base. If you don't have access to Road Base, this is a good alternative.
For a professional result, add a 20mm covering of 5mm crusher dust over the roadbase. This will give your artificial grass a smooth and even finish.
It's also a good idea to include a thin layer of Zeolite on top of the granite, especially if you have dogs. This natural volcanic mineral absorbs odours and reduces heat, making your artificial turf more comfortable to walk on.
In general, a good base layer should be around 60-70mm thick, and it's essential to compact it properly with a compactor. This will ensure your artificial grass stays stable and even.
Why Is It So Crucial?
It's crucial to prep the ground before installing artificial turf. A poorly prepped base layer can lead to a sinking lawn, bumps, wrinkles, and edges uplifting.

Pests like gophers and moles will have more access to ruin your installation if the base is not solid. Weeds will also flourish without a properly compacted sub base.
You'll need to remove 100mm of existing soil and then flatten it. This is a crucial step to ensure a solid foundation for your artificial turf.
A minimum of 2 inches of sub-base is recommended for residential turf installation. This offers enough of a base for drainage, durability, and added stability.
For commercial turf installation jobs, you will likely need closer to a 3 inches to 4 inches sub-base due to the higher volume of foot traffic.
A solid sub-base is essential to prevent the environment and plant life from "reclaiming" your installation area. It also adds a level of comfort and aesthetic appeal to your artificial turf installation.
Here are the key reasons why a sub-base is so important:
- Increases the durability and longevity of your turf, especially in high-traffic areas.
- Prevents the environment & plant life from “reclaiming” your installation area.
- Adds a level of comfort and aesthetic appeal to your artificial turf installation.
- Ensures proper drainage for any water or rainfall.
Optional Layers and Infill
Infill material, often sand or rubber crumbs, is spread and brushed into the turf to give the grass blades support and keep the turf in place.
This gives the grass blades support, adds weight to keep the turf in place, and ensures the pile remains upright for a natural look.
You may also want to consider adding other artificial grass underlays, such as drainage layers, weed barriers, and padding, to provide added comfort and help lengthen the lifespan of your new lawn.
Infill
Infill is a crucial layer in artificial grass installation. It's usually made of sand or rubber crumbs.
The primary function of infill is to provide support to the grass blades, keeping them upright and giving the turf a natural look.
Infill adds weight to the turf, which helps keep it in place. This is especially important in areas with high foot traffic.
The type of infill material used can affect the overall performance and appearance of the artificial grass. Some infill materials may be better suited for specific applications, such as sports fields or residential lawns.
Optional Layers

Class II Road Base is the best base material for artificial grass, providing a solid foundation for professional installations.
For a more comfortable and long-lasting lawn, you may want to consider adding a drainage layer under your artificial turf.
Decomposed granite and a stabilizer can be used as a base layer for DIY installations, but it's essential to note that they might not provide the same level of solid foundation as Class II Road Base.
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Drainage and Weed Prevention
Drainage is crucial for artificial grass, and it's not just about aesthetics. A quality sub-base allows water to percolate through rapidly, preventing pooling and flooding.
To achieve the best drainage results, opt for an artificial grass that's fully permeable and allows water to escape through the backing material. Two popular artificial grass drainage grids are AirDrain and DrainCore. In severe cases, french drain systems can be installed.
A proper sub-base also helps maintain a dry, usable surface even after heavy rain. If you're installing artificial grass in an area prone to intense rainstorms, like Modesto, proper drainage is essential.
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To prevent weeds from growing through the artificial grass, lay down a weed membrane or barrier and secure it with landscape staples or fixing pins. This will create a barrier that makes it nearly impossible for weeds to penetrate from below.
Here are some options for artificial grass underlay:
- Decomposed granite (DG) is a popular alternative to road base, making it easier to handle for DIY installers.
- Apply about 2" of DG evenly with a push broom, then compact the surface with a heavy-duty roller.
- Roll along the DG in multiple directions for the best results.
Weed Prevention
Weed prevention is a crucial aspect of artificial grass installation, and it's not just about keeping your lawn looking tidy. A proper sub-base adds an extra layer of protection against weed growth.
To prevent weeds from growing through the artificial grass, it's essential to install a weed barrier. This can be done by laying down a weed membrane or barrier and securing it with landscape staples or fixing pins. We recommend ensuring the barrier is perforated to allow water to drain properly.
Weed growth through the artificial grass can be a significant problem, but a specific grade of geotextile membrane can help block weed growth while still allowing water to drain freely. This type of membrane creates a barrier that makes it nearly impossible for weeds to penetrate from below.
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A good sub-base is key to preventing weeds from growing up through the artificial grass. Without an adequate layer between the ground and the synthetic lawn, weeds can easily grow through and cause problems. To avoid this, we recommend installing a sub-base that is specifically designed for artificial grass.
Here's a quick rundown of the materials you'll need for a DIY weed prevention project:
- Weed barrier or membrane
- Landscape staples or fixing pins
- Geotextile membrane (optional)
- Decomposed granite (DG) or road base
- Stabilizer
By following these simple steps and using the right materials, you can prevent weeds from growing through your artificial grass and keep your lawn looking its best.
Drainage Solutions
Artificial grass that's fully permeable is the way to go for the best drainage results. This type of grass allows water to escape through the backing material.
Drainage grids like AirDrain and DrainCore can be installed to lift the surface and create an air void for ventilation and water flow. This is especially useful in areas prone to heavy rainfall.
French drain systems can be installed in severe cases where water drainage is a major concern or there are existing drainage problems. This will ensure that water flows away quickly and doesn't accumulate.
A quality sub-base is essential for proper drainage, allowing water to percolate through rapidly and preventing pooling and flooding. This is especially crucial in areas like Modesto where intense rainstorms are common.
Installing a sub-base is not optional, even if you're installing artificial turf over paving or concrete. Without an adequate layer, the turf will sink and may lead to drainage problems and pooling water.
A weed barrier with perforations is a must-have to prevent encroaching plant life and ensure proper drainage. This simple step can make a big difference in the long run.
Surface and Evenness
A smooth, consistent surface is essential for artificial grass installations, and it's not just about aesthetics – it's also a matter of safety and functionality.
An even surface ensures no tripping hazards or uneven areas, which is particularly crucial for specialized installations like putting greens or sports fields where surface consistency directly impacts performance.
A well-prepared sub-base is key to achieving a smooth, consistent surface, and it's worth the extra effort to get it right.
No tripping hazards or uneven areas mean a safer and more enjoyable experience for users, whether it's for casual play or competitive sports.
Cost and Importance
Investing in a proper sub-base is a crucial step in installing artificial grass, and it's essential to consider the long-term costs of skipping this step.
Uneven surfaces and poor drainage can lead to costly repairs or even complete reinstallation of the artificial grass.
Premature wear and tear is a common issue in high-traffic areas, especially if the sub-base is inadequate.
The consequences of inadequate sub-base preparation can be severe, including water accumulation, mold growth, and foul odors.
These issues not only affect the appearance and usability of your lawn but also impact your wallet in the long run.
A proper sub-base can prevent these problems and ensure a smooth, even surface that's comfortable to walk on.
Installation and Professionals
Installing an artificial grass sub-base can be a bit of a challenge, but it's a crucial step in ensuring your new lawn looks and performs its best.
While it might be tempting to try a DIY installation, the reality is that sub-base preparation requires specialized knowledge and equipment.
Professional installation ensures proper depth and compaction tailored to your specific soil type and climate, and correct materials selection based on the intended use of your lawn.
At a bare minimum, you should ensure that the sub-base is stable enough to withstand high traffic areas or the weight of outdoor furniture.
Without an adequate sub-base, you may find yourself with a sinking lawn, which can eventually lead to drainage problems and pooling water.
The best sub-bases for artificial grass will not only increase the lifespan of your investment but also maximize the benefits of installing artificial turf in the first place.
Installing a weed barrier in applicable areas can also help prevent encroaching plant life, but make sure it's perforated so water can properly drain.
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A professional installation company like Modesto Artificial Grass takes pride in their meticulous sub-base preparation, which is a crucial step in setting the stage for a beautiful, long-lasting artificial lawn.
Their approach involves a site assessment to evaluate the existing soil conditions, drainage patterns, and intended use of the area, followed by excavation, geotextile membrane installation, and precision grading.
Types and Options
For artificial grass sub-base installation, you have three main options to consider. CMB, or Crushed Miscellaneous Base, is a popular choice due to its cost-effectiveness and durability.
CMB is made of recycled asphalt or concrete and a ¾ inch mixture of sand, gravel, or sand. This combination provides a stable and structurally sound layer for your synthetic lawn.
Class II road base is another option, but it's often more expensive due to a rigorous testing process that ensures optimal consistency and durability. DG, or Decomposed Granite, is a sub-base composed of granite sand, gravel, and clay mixed together.
Here are the three main sub-base materials and their characteristics:
Ultimately, the best sub-base material for your project will depend on specific factors, so it's best to consult with an artificial grass lawn installation company for a free estimate and expert advice.
Types of
Artificial turf sub-base materials are broken down into three main categories.
CMB, or Crushed Miscellaneous Base, is an ideal option to lay between the ground and your artificial turf, made of recycled asphalt or concrete and a ¾ inch mixture of sand, gravel, or sand.
Class II road base is another option, which goes through a rigorous testing process to ensure optimal consistency and durability, but often runs at a higher price point than CMB.
Decomposed granite, or DG, is a sub-base composed of granite sand, gravel, and clay mixed together to create a stable and structurally sound layer for your synthetic lawn.
CMB is the most commonly selected sub-base material because of its cost-effectiveness and durability.

Here are the three main types of artificial grass sub-bases:
Each sub-base material has its own pros and cons, and the best choice for your backyard will depend on specific factors.
Paver vs Turf
You can use a paver base for artificial turf installation, and it's a suitable option depending on your project requirements. However, installing pavers is more expensive than the typical turf base material, so it may not be the most cost-effective choice.
Installing artificial grass over pre-existing pavers is a common scenario, as it saves you the cost of removing the pavers first.
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Pet Friendly Lawns
Pet-friendly lawns are a must for any homeowner with furry friends. Preparing the base for artificial pet turf is similar to regular synthetic lawns, but with a crucial twist: lay a 1/4" layer of Zeofill to prevent pet odors.
Zeofill acts as a deodorizer and traps ammonia smells from urine, making it a game-changer for pet owners. A weed barrier is not recommended when prepping the sub base material for pet turf, so be sure to skip that step.
If your artificial grass lawn has any dips, consider installing a french drain to accelerate water movement and combat odors. This will help percolate liquids quicker and keep your pet turf system smelling fresh.
Tools and Requirements
To install an artificial grass sub base, you'll need a few essential tools. A rake is a must-have for smoothing out the base material.
You'll also need a shovel to dig and move the base material around. A wheelbarrow can be helpful for transporting heavy loads.
Some additional items to consider are nails and stakes for securing the base, and landscape fabric as an optional weed barrier. A utility knife can be useful for cutting the fabric to size.
Here's a list of the tools you'll need:
- Rake
- Shovel
- Wheelbarrow
- Nails and Stakes
- Landscape Fabric (Optional Weed Barrier)
- Utility Knife
- Plate Compactor or Lawn Roller
Required Tools
Installing artificial grass requires the right tools to get the job done efficiently. You'll need a rake to level the ground and remove any debris.
A shovel is necessary for digging and excavating the area where the artificial grass will be installed. Don't forget to use a wheelbarrow to haul away the dirt and other materials.
If you're planning to install artificial grass on a slope or uneven terrain, you'll need nails and stakes to secure the base material in place. Landscape fabric can be used as an optional weed barrier to prevent weeds from growing up through the artificial grass.
A plate compactor or lawn roller is necessary to compact the base material and ensure a smooth surface for the artificial grass to be installed on.
How Much Is Required?

For a residential turf installation, you'll want to have at least 2 inches of sub-base. This provides a solid base for drainage, durability, and stability.
You can't just eyeball the amount of sub-base you need, though - it depends on how much of your yard you're covering with artificial turf. Commercial jobs require more, with a minimum of 3 inches to 4 inches of sub-base needed to handle the higher volume of foot traffic.
Here's a quick rundown of the recommended sub-base amounts:
- Residential: 2 inches
- Commercial: 3-4 inches
It's always a good idea to consult a turf installation professional to ensure you have the right amount of sub-base for your specific job. They can guide you through the process and recommend the best sub-base material for your landscape.
DIY and Heavy Traffic
For DIY installers, preparing the sub-base layer can be a challenge, especially when it comes to finding access to heavy machinery. Renting expensive equipment can be a significant cost, so it's recommended to work with tools that can be handled by one person.
To save money and still achieve a solid base, use decomposed granite (DG) as an alternative to road base. This material is easier to get ahold of and can be spread evenly across the surface with a push broom.
A heavy-duty roller is then used to compact the surface, rolling in multiple directions for the best results. This will help create a sturdy base that can withstand rainfall and heavy foot traffic.
A stabilizer must be applied to the DG after compaction to prevent the base from washing away with rainfall. This is crucial for the lifespan of your artificial lawn, and skipping it can have detrimental effects.
DIY Installers
As a DIY installer, you'll want to save money by avoiding expensive machinery rentals. Instead, use tools that can be handled by one person to lay the base material.
You can prepare the sub-base layer by removing the soil and applying a weed killer to the surface. This is a crucial step to ensure a smooth installation process.

Decomposed granite (DG) is a great alternative to road base, and it's easier to get ahold of. Apply about 2" of DG evenly with a push broom along the surface.
A heavy-duty roller is necessary to compact the DG, which should be done in multiple directions for the best results. This will ensure a sturdy base for your artificial turf.
To prevent the base from washing away with rainfall, you must apply a stabilizer to the DG after compaction. Skipping this step will be detrimental to the lifespan of your new artificial lawn.
Allow the area to fully dry before moving forward with the artificial grass installation. This will ensure a successful and long-lasting installation.
Heavy Traffic
For heavy traffic areas, you'll want to add extra stability to the turf base layer. Geotextile permeable pavers can provide this support, so lay them along the surface before unrolling the fake grass.
Heavy traffic will put a lot of stress on the base layer, so it's essential to prepare it properly. This includes using high-quality materials and following the manufacturer's recommendations for the synthetic turf base layer.

To create drivable grass, you'll need to use geotextile permeable pavers. These pavers will help distribute the weight of cars and provide a stable surface for the artificial grass to sit on.
It's crucial to prepare the sub-base properly to avoid any mistakes that could compromise the installation. This includes using high-quality materials and following the manufacturer's recommendations.
Consequences and Longevity
Skipping the base layer or sub-base for artificial grass can lead to poor drainage, an uneven surface, weed growth, and poor stability.
If you don't install a solid base, the soil will shift over time, causing dips and sagging that can become a safety hazard.
Uneven surfaces can look unnatural and feel uncomfortable underfoot, making your lawn hard to enjoy.
Poor drainage can lead to water accumulation, mold growth, and foul odors, creating an unpleasant environment.
Premature wear and tear, especially in high-traffic areas, can be a big problem if you don't prepare the sub-base properly.
Investing in a proper sub-base is often more economical than dealing with costly repairs or even a complete reinstallation down the line.
Frequently Asked Questions
What should you put down before laying artificial grass?
Before laying artificial grass, prepare the base with geotextile weed barrier fabric, crushed stone or decomposed granite, and silica sand or sand infill. A turf adhesive is also recommended to ensure a secure and long-lasting installation.
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