If you’ve ever priced out an artificial grass tile installation or dug into the do’s and don’ts of DIY landscape projects, you’ve probably stumbled across a lot of conflicting advice. Some “experts” online will tell you to layer 6 inches of compacted soil before putting down tiles, while others swear you can just set them on concrete and call it a day. As the owner of an artificial grass tile supply company that’s worked with everyone from small residential homeowners to large commercial property managers over the past 7 years, I’ve heard every version of this question—and I’ve fielded more than a few calls from people who installed their tiles wrong and ended up with uneven patches, standing water, or tiles that pulled up in the first heavy rain. Today I’m breaking down exactly what’s under those tiles, what’s optional, what’s non-negotiable, and how that bottom layer directly impacts how long your artificial grass lasts. Artificial Grass Tile
First, let’s get one thing straight: artificial grass tiles are not like laying a decorative patio stone or a deck. Those sit on a level, stable base that’s meant to support weight, but grass tiles have to serve a dual purpose—they need to be soft underfoot enough for kids to play on or pets to run around, but also firm enough that they don’t shift when someone steps on them. The soil (or whatever you choose for a base layer) is the backbone of that balance. I’ve seen two main scenarios play out when it comes to the base beneath artificial grass tiles: the common residential backyard or balcony install, and the high-traffic commercial project like a dog park or rooftop patio. Each has different needs, so let’s start with the basics of what a base layer actually does.
When you install artificial grass, even tiles, the goal of the base is twofold: drainage and stability. If water can’t move through the base layer, it will pool on top of the tiles, turn that nice green grass to a muddy, smelly mess, and eventually cause the adhesive or interlocking edges of the tiles to break down. Stability means preventing settling—no one wants to step on their patio and have one tile sink 2 inches lower than the rest, which is a tripping hazard and ruins the look of the install. That’s where the question of soil comes in, because soil is one of the most common base materials people ask about.
Let’s start with when soil is a good idea, and when it’s not. Most of the time, for residential installs on the ground level where the area has natural soil underneath, you will need some sort of soil-based base layer—but not the topsoil you’d buy for a garden, I want to be clear. Topsoil is loose, it compacts unevenly, and it holds too much water. The soil we recommend for base layers is screened, compacted fill soil (often a mix of sand and clay, but screened to remove rocks and debris) or, more commonly, decomposed granite for areas that need extra drainage. Wait, but why not just leave the existing topsoil? Because topsoil is organic, which means it will shift over time, it can grow weeds through your tiles, and it won’t provide the uniform stability you need. I had a customer reach out to me last year who installed his artificial grass tiles directly over the existing topsoil in his backyard, and within 6 months, half the tiles had pulled up because the soil settled unevenly under the back corner of the patio. He had to redo the entire base, adding 4 inches of compacted fill soil, before the new tiles stayed in place. That’s a common mistake.
Now, what about when you don’t need soil? If you’re installing artificial grass tiles on a raised platform, a rooftop, or over existing concrete, you won’t need any soil at all. In fact, putting soil over concrete would be a disaster—you’ll trap moisture against the concrete, leading to mold, and you’ll have drainage issues because the concrete is non-porous. For those installs, we recommend a 1-inch layer of compacted sand as a base between the concrete and the tiles. That sand is enough to create a level, soft underlayer, and it lets any water that seeps through the tiles drain off to the edges of the concrete, instead of pooling under the surface. I’ve done multiple rooftop installs for restaurants in the city over the years, and none of them use soil beneath their tiles—sand is the only base layer there, and they’ve had zero issues with drainage or settling in the 5 years since they were put in.
Another common scenario: pet turf. If you’re installing artificial grass tiles for dogs, the base layer is even more critical, and the question of soil comes up a lot here. Many pet owners want to use soil as a base because they think it will help with odor control, but that’s not the case. In fact, soil can trap bacteria and odors, and it’s hard to clean when your dog has an accident. For pet turf installs, we recommend a base of compacted gravel (not soil) with a layer of permeable landscape fabric over top to keep weeds from growing up. The gravel provides excellent drainage—so urine and rain water can move through the tiles instead of pooling—and the landscape fabric keeps the base stable. I recently worked with a customer who has 3 large dogs, and he originally wanted to put soil under his tiles because his neighbor had done that and complained about odors. We talked him into using gravel instead, and he’s told me that a year later, there’s no odor, the turf is easy to hose down, and no tiles have shifted. That’s the kind of outcome we want for every customer.
Now, let’s talk about the science here, because I don’t want to just throw around advice without explaining why it works. Artificial grass tiles have a typical drainage rate of about 10 to 15 gallons per square foot per hour, which means the base beneath them needs to match that rate to avoid pooling. Soil, especially compacted fill soil, has a drainage rate of around 5 to 8 gallons per square foot per hour—slow enough that if you use pure soil, you’ll get water pooling on top. That’s why we mix soil with sand or use alternatives like gravel or decomposed granite for better drainage. On the stability side, the bearing capacity of compacted soil is around 2,500 to 3,000 pounds per square foot, which is more than enough for residential foot traffic, but for high-traffic areas like dog parks or event spaces, you need a base with a higher bearing capacity—around 5,000 pounds per square foot. That’s where decomposed granite or compacted gravel comes in, because their bearing capacity is double that of standard soil, so they can handle heavy foot traffic, patio furniture, or even vehicle access if you’re installing tiles on a driveway.
Wait, but what about if someone really wants to use soil for their base? Is there any scenario where that works? The only time I’d even consider recommending soil as a primary base layer is for a very small, low-traffic patch of artificial grass, like a small balcony or a side yard that only gets occasional use. Even then, you have to amend the soil to improve drainage—mix in 30% coarse sand and 10% gravel to increase the drainage rate, and make sure you compact it properly. Compaction is key here—if you just spread loose soil and walk on it, it will settle over time. We always recommend using a plate compactor to press the base layer down, to get a uniform density of around 95% Proctor density, which means it won’t shift or settle. I had a customer a couple years ago who tried to compact his soil with just a lawn roller, and it turned out he didn’t get it compacted evenly. One week after he installed the tiles, it rained heavily, and the loose spot in the soil caused a tile to sink, so he had to pull all the tiles up, re-compact the base properly, and start over. That’s a time and money mistake we want people to avoid.
Another thing to consider is drainage slope. No matter what base material you use beneath your artificial grass tiles, you need a slight slope—about 1/4 inch per foot—so water can drain off the surface, not pool in the middle. When soil is part of the base layer, it can be tricky to get that slope uniform, because soil shifts as it compacts. That’s why we often recommend adding a layer of crushed stone (3/4 inch to 1.5 inch size) as a sub-base before the soil or sand, to lock in the slope and make it permanent. I use this on almost all residential ground-level installs—crushed stone at the bottom, then 4 inches of compacted fill soil on top, then the turf tiles. That way, the slope stays consistent, the base is stable, and drainage works as it should.
I also get a lot of questions about weeds, which ties directly into the base layer. If you use soil beneath your tiles, you’re giving weed seeds a place to root, which means you’ll get weeds growing up through your artificial grass, which is not easy to remove. To prevent that, we always recommend adding a layer of non-woven permeable landscape fabric between the base layer and the soil, or between the base layer and the tiles if you’re not using soil. The fabric stops weed seeds from growing up, lets water drain through, and keeps the base layer from mixing with the soil over time. I had a customer last summer who skipped the landscape fabric and put soil directly under his tiles, and within two months, he had dandelions popping up all over his turf. He had to pull all the tiles up, put down landscape fabric, and redo the base, so that’s another common pitfall.
Now, let’s clear up a myth I hear all the time: some people think that using a soil base will make the artificial grass feel more natural, like real grass. That’s not true at all. Artificial grass tiles have their own infill (the small sand or rubber particles that sit between the blades) that gives them the soft, realistic feel. The base layer beneath the tiles only impacts stability and drainage, not the feel underfoot. I’ve installed both soil-based and sand-based bases on the same type of turf tiles, and the feel is identical—what changes is how long the tiles last, how well they drain, and how much maintenance you have to do.
So, putting all this together, what’s the short answer to “Do artificial grass tiles require any special soil beneath them?” It’s: not always, but you almost certainly need a base layer that works with (or replaces) soil to provide proper drainage and stability, depending on your install location. If you’re installing on ground level over existing soil, you’ll need a modified soil base (mixed with sand and compacted) or an alternative like decomposed granite. If you’re installing on concrete, a rooftop, or a raised platform, you won’t need any soil—just a sand base, landscape fabric, and proper slope. For pet turf or high-traffic areas, skip the soil entirely and use gravel or crushed stone for better drainage and odor control.
At the end of the day, the base is the most important part of any artificial grass tile install, and cutting corners here is the number one reason people end up with unhappy results. I’ve seen so many customers save a few dollars by skimping on the base layer, only to spend twice that amount redoing the install within a year. As someone who’s been in the artificial grass tile supply business for 7 years, my job isn’t just to sell you tiles—it’s to make sure your install lasts for 10, 15, even 20 years, which is what good artificial grass should deliver. Whether you’re a homeowner in the process of planning a backyard project, a contractor working on a commercial space, or just curious about what goes into a quality artificial grass install, feel free to reach out to our team for a free consultation. We can walk you through the best base layer for your space, answer any other questions you have, and help you get the perfect artificial grass tiles for your project.
Now, before I wrap this up, I want to add a quick note for anyone planning a DIY install: if you’re not comfortable compacting a base layer, checking drainage rates, or getting the slope right, it’s always worth hiring a professional. Even if you’re just using sand instead of soil, getting a uniform base is tricky, and a mistake here can ruin the look and function of your tiles. For those who do want to tackle it themselves, take the time to research the proper base layers for your specific install location, don’t skip the compaction step, and always use landscape fabric to prevent weeds.
At the end of the day, artificial grass is a big investment, and the base beneath the tiles is what will make that investment pay off. Whether you choose to use a modified soil base, a sand base, gravel, or something else, the key is focusing on drainage and stability, not just following generic online advice. If you have more questions about what base layer is right for your artificial grass tile project, don’t hesitate to connect with our team to discuss your needs and get guidance tailored to your space.
Artificial Flower Grass Wreath References:
- American Society of Landscape Architects. (2021). "Base Layer Requirements for Synthetic Turf Installations." Landscape Architecture Technical Bulletin.
- International Green Building Council. (2022). "Drainage Performance of Synthetic Turf Base Materials." Sustainable Site Design Guidelines.
- Pet Product Association. (2023). "Best Base Layers for Pet-Friendly Synthetic Turf." Pet Turf Installation Standards.
- National Artificial Turf Association. (2020). "Installation Best Practices for Modular Artificial Grass Tiles." Industry Technical Manual.
Zhejiang Ruopei Arts & Crafts Co., Ltd.
Address: Majian Industrial Zone, Lanxi City, Jinhua City, Zhejiang Province
E-mail: tiffany@ruopeichina.com
WebSite: https://www.boxwoodpanel.com/
