Your artificial grass doesn’t need watering, but it does need a sturdy foundation
The aggregate for artificial turf creates a stable foundation below your fake grass, preventing soil expansion and contraction that leads to wrinkles or soft spots in your lawn.
Crushed miscellaneous base offers an affordable sub-base option for your artificial turf project, though it can struggle with drainage and requires careful smoothing during installation.
Your sub-base layer needs two to four inches of depth, with decomposed granite providing better drainage than CMB while achieving a smoother finish for your artificial lawn.
Hiring a local artificial grass installing professional removes the guesswork from sub-base selection and depth calculations, ensuring your foundation supports your lawn for years to come.
It may look simple enough, but installing fake turf is not the same thing as putting an outdoor rug on your patio—even if they’re both made of plastic. It takes a lot of digging, and you’ll need a solid foundation—of both installation knowledge and literally underneath your grass. That’s where sub-base comes in.
Artificial grass sub-base refers to the mix of materials put directly below your fake turf. It creates a smooth surface and supports your lawn for years—and even decades—to come. Here’s what you need to know.
The main purpose of using a sub-base is to create a solid foundation for your lawn. Soil, no matter how compacted, expands with moisture and contracts as it dries. Clay soil is particularly vulnerable to this type of movement. Sub-base doesn’t expand or contract. The result is a smooth lawn without wrinkles or soft spots from uneven soil. Some sub-bases even help with drainage, preventing water from pooling in your yard.
Wondering what to put under artificial grass? The best sub-bases are a mixture of gravel and sand. Some varieties come from concrete, asphalt, or wood, but the most common types are CMB, Class II road base, or decomposed granite—and there’s a good reason.
For the average homeowner, the cost of artificial turf is usually upwards of $4,000. You can save a little cash by choosing crushed miscellaneous base (CMB) as your sub-base. This sub-base material is a mixture of sand, gravel, and recycled concrete or asphalt. It’s generally the most affordable option and compacts easily, making it a popular choice in landscaping. Unfortunately, it can be hard to smooth out, and it’s non-porous, so it can struggle with drainage.
Class II road base is similar to CMB, but it has to undergo extensive testing to ensure that it can perform well under roads, parking lots, and sidewalks. Commercial applications—like golf courses or athletic fields—more commonly use this sub-base. It’s not budget-friendly, and usually not necessary for a residential backyard.
Decomposed granite or limestone chippings are natural derivatives that form when stone erodes and weathers down over time. Stone chippings come with a higher cost, but they do achieve a smoother finish than CMB. They’re also better for drainage, which helps promote the long-term health of your backyard (especially if you’re trying to create a pet-friendly artificial turf space).
A local artificial grass company should be able to tell you the exact amount of sub-base needed for your project. They may even recommend a laying course, an additional layer of granite dust or sand that goes over the sub-base to make the surface even flatter and smoother.
In general, your sub-base layer should be two to four inches deep. The material is generally sold in loose truckloads or bags by the ton. It depends on the sub-base type. For a 100-square-foot area, you’ll need around:
1 to 2 tons of CMB
1 to 1.5 yards of decomposed granite
You may have trouble managing the sheer weight and volume on your own, but you can hire a local stone and gravel company to deliver it to your yard.
First of all, the gentleman I dealt with (Cam?) was very responsive to my many questions and concerns throughout the project, which is a huge plus to me. From the first time I met him for the estimate all the way til the completion of the job, he and his crew were professional and respectful....
All Star Paving and SealingWe had a 20+ year old landscape lighting system that needed replacement. Midwest Lightscapes worked with us to design a much improved lighting system, lighting the exterior of the house and the back yard. Installation of the 45 light system took one and one-half days, and went very smoothly....
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Ruby Home and Hauling ServicesReceived ideas for future landscape plans...quote to do the work seemed a bit high but I did not have any other quotes to compare it to, so perhaps that is the going rates. <br />
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Feazel Roofing discussed the job in detail prior to beginning. The day before the work commenced they delivered the materials to the site and put them where we had agreed upon. At the time of the commencement of work, they brought numerous tarps that were blue in color. They covered the...
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