Artificial grass in Miami lives or fails beneath the surface. The infill, base, drainage system and preparation work determine whether your turf stays level and odor-free through summer thunderstorms, holds up under a dog's paws, or develops dips, puddles and seam failures within a year. This guide walks you through every layer: what infill does, how much you need, what to put under the turf, how to prepare Miami's sandy and caliche soil, how water moves through and away from the installation, and the finishing details that separate a real installation from a shortcut job.
Whether you are converting a lawn that has died in the heat and shade, building a dog run that will not turn to mud, installing turf around a pool deck, or preparing a yard for a sale or move-in, understanding base prep and drainage means you can ask the right questions and recognize honest work. This is the reference guide for homeowners and property managers in Miami and the surrounding areas who want to know what is actually happening under their turf.
Turf Infill Options: Silica, Coated Sand, Zeolite and Envirofill
Infill is the material spread across the turf after installation. It serves four purposes: it props up the grass fibres so they stand upright and feel natural underfoot, it protects the backing from ultraviolet light, it adds weight so the turf does not shift in wind or under foot traffic, and it plays a role in drainage and water movement through the system. The type of infill you choose affects performance, feel, durability and maintenance needs.
Silica sand is the foundational infill on most residential installations. It is affordable, widely available, and does the job of ballasting and protecting the backing. Silica sand is angular and can feel firm underfoot, particularly in heat. Coated sand rounds the grains and often adds a layer of colour or a binding agent. Coated sand feels gentler on bare feet and knees, and the colour can be matched to the turf blade for a more natural appearance. Zeolite is a porous mineral infill that absorbs and helps neutralize urine and odors, making it popular for Pet Turf and Dog Run Installation. Antimicrobial and cooling coated infills, sold under brand names such as Envirofill, add additional properties: antimicrobial agents reduce bacterial growth, and cooling formulas lower surface temperature in direct sun, a real benefit in Miami's heat. These specialized infills cost more but can extend the life of the turf and improve comfort in high-traffic or pet-use areas.
Crumb rubber (recycled tire crumb) is an infill found on sports fields and synthetic turf courts where impact absorption and ball response are design requirements. Crumb rubber is not recommended for residential yards or pet areas. It retains heat, can leach compounds, and is not the right choice for a family backyard or a Pool Surround Turf installation. Ask your installer what infill is in the spec and why it is right for your use.
How Much Infill Artificial Grass Needs, and Why
Infill is measured in pounds per square foot, and this number is one of the most common places where cheap installations cut corners. Too little infill leaves the fibres floppy, allows the backing to be exposed to sun damage, and fails to anchor the turf securely. The typical range for residential turf is 1.5 to 3 pounds per square foot, depending on the turf product, the pile height, the face weight, and the intended use. A dense, tall turf for a dog run or play area will need more infill than a shorter, finer turf for a patio or pool surround. A Putting Green Installation has its own specifications, often higher, because the ball response and surface consistency demand it.
The infill amount is not something to guess about. It should appear in writing on your estimate and installation spec, alongside the turf product name and face weight. When you get a quote, ask the installer to specify the infill type and the pounds per square foot they will install. If they cannot give you a number or say it varies, that is a red flag. Proper infill is part of a real installation, and you deserve to know what you are paying for.
What to Put Under Artificial Grass for Drainage
The layers under your turf matter as much as the turf itself. The process starts with removal: the existing lawn, sod, or old turf and all roots must come out. Dead St. Augustine grass, chinch bug damage, and thinned patches in Miami yards are common reasons for a turf conversion, and leaving roots or debris underneath will cause the new turf to settle unevenly and fail at seams. After removal, the ground is excavated and graded so water runs away from the house and the pool deck, not toward them. A slight slope of 1 to 2 percent is standard.
Next comes the base layer. In Miami, this typically means removing the poor-draining sand and caliche, then laying and compacting a free-draining base of decomposed granite or crushed base rock, usually three to four inches thick after compaction. A weed barrier may be laid at this stage to prevent weeds from growing up through the turf, though on very sandy soil or in shaded areas where weeds are not a major concern, it is optional. For Patio, Balcony and Turf-Paver Strips, the base is already solid concrete or pavers, so the step is different: a draining underlay or pad is laid on top of the hard surface to create a cushion and allow water to escape at the edges.
For hard surfaces like concrete, balconies, or rooftops, never glue turf flat onto the slab. Water will pool underneath and cause odor, mold, and turf failure. An underlay with edge drainage is essential. After the base is compacted and level, the optional underlay or pad goes down (recommended for pet areas, play areas, and hard surfaces for comfort and drainage), and then the turf is laid, seamed, nailed, and infilled. Each layer has a job; skipping or shortcutting any of them will show up in the first year.
Base Prep on Miami Caliche: Excavation, Base Rock and Compaction
Miami's soil is a challenge. The ground spreads flat across sand and porous limerock, and while it drains quickly in some spots, caliche (a hard, calcium-cemented layer) blocks drainage and creates pockets where water pools. A proper base prep removes or breaks through the problem and creates a firm, well-draining foundation for your turf. This is not cosmetic work; it is the difference between a yard that stays level and one that settles into dips and puddles within months.
Excavation typically removes the top four to six inches of existing soil and roots, and sometimes deeper if caliche is encountered. The ground is then graded with a slope away from the house and pool so water runs off naturally. A plate compactor (a vibrating machine that weighs several hundred pounds) is used to compact the base material in thin lifts, usually two to three inches at a time. Each lift is compacted firmly before the next layer is added. Three to four inches of compacted base rock is typical for residential work. An uncompacted base is one of the fastest ways to fail: the turf will settle unevenly, seams will separate, and puddles and odors will develop. Compaction is not optional, and it is not something you can see once the turf is down, so it has to be done right the first time.
If your yard has a real drainage problem, water pooling after rain, or standing moisture in low spots, that problem must be addressed before turf goes down. In some cases, this means extending the excavation, improving the grade, or installing a French drain or perimeter swale. If drainage cannot be fixed, the job should not proceed. We assess this on site during the estimate, and if the water problem is beyond turf, we will tell you that and suggest what needs to happen first.
Artificial Grass Drainage and Underlay: Perforated vs Fully Permeable
Artificial grass is designed to drain, but the rate matters. Turf backing is either perforated (with small holes punched through) or fully permeable (a woven or non-woven material that allows water through without holes). Drainage rate is measured in gallons per hour per square foot. A typical residential turf drains at 5 to 10 gallons per hour per square foot, which sounds fast until you realize that a summer thunderstorm in Miami can dump an inch or more of rain in minutes. The real test of drainage is not a light watering; it is a heavy downpour or a dog area that gets soaked daily.
A fast-draining turf backing is only half the story. The base underneath has to drain just as fast, or water will pool on top of the compacted base and sit under the turf. This is why base prep matters so much in Miami. A well-compacted, properly sloped base of crushed rock or decomposed granite will shed water quickly. A poorly prepared base of clay or uncompacted soil will hold water. For Pet Turf and Dog Run Installation, drainage is critical because urine sits on wet surfaces and causes odor and breakdown. For Playground and School Turf, fast drainage prevents puddles and keeps the surface safe.
Underlays and drainage pads add another layer. A quality underlay under the turf improves comfort, extends turf life by protecting the backing from direct contact with the base, and can speed drainage further. For hard surfaces like concrete or Patio, Balcony and Turf-Paver Strips, an underlay with edge drainage channels is essential so water does not pool at the perimeter. Ask your installer for the drainage rate of the turf and underlay in writing, and confirm that the base has been graded and compacted to shed water away from the house.
Seams, Nails, Edging and Power Brooming
The finishing details separate a professional installation from a shortcut job. Seams are where two pieces of turf meet, and they are the weak point of any installation. A proper seam is joined with seam tape (an adhesive-backed fabric) and turf adhesive applied to both the backing and the tape. The two pieces are pushed together with the grain aligned so the fibres run the same direction, and then the seam is rolled or pressed to ensure full contact. A visible seam, one where you can see a gap or feel a ridge, means the adhesive did not set properly or the pieces were not pushed together firmly. Over time, a weak seam will separate, and water and dirt will work into the gap.
Nails or staples hold the turf down at the perimeter and at seams. They should be spaced 6 to 12 inches apart depending on the turf weight and the slope, and driven flush with the backing so they do not create a tripping hazard. Edging is the perimeter detail. Turf should be secured to a bender board (a flexible steel or plastic edge), a concrete curb, or a paver border so it does not fray or curl up. At pavers and pool decks, the turf should be cut tight to the edge so water drains off cleanly and does not pool at the seam. Power brooming is the final step: a stiff brush or power broom is used to stand the fibres upright after installation and to spread the infill evenly so no backing is visible and the surface looks uniform.
What you should see after installation is a flat, seamless surface with no visible backing, no gaps at seams, tight edges, and infill spread evenly. What you should not see is gaps between turf pieces, loose edges, wrinkles, or backing showing through. If you see these things in the first week, the installer did not finish the job properly.
What a Written Turf Spec Should Include
Before work begins, you should have a written specification that details every material and every step. This is your protection and your proof of what was promised. A complete spec includes the turf product name and fibre type (polyethylene, polypropylene, nylon), the face weight in ounces per square yard, the pile height in millimeters, the backing type and its drainage rate in gallons per hour per square foot, the infill type and the amount in pounds per square foot, the base material (crushed rock, decomposed granite) and the compacted depth in inches, whether a weed barrier is included, the seam method (tape and adhesive), the edging type, cleanup and haul-off, and the workmanship warranty period (typically one to three years on the installation, not the turf itself). The spec should also note the square footage, the total price, and the timeline.
A written spec is not a sales gimmick; it is the standard of the trade. Any turf installer who will not put the details in writing is not someone you should hire. The spec is your record of what you paid for, and it is your proof if something goes wrong. When you call for an estimate, ask the installer to measure the yard on site and provide a written quote with all these details before you commit. We provide a free on-site measurement and a written spec with every estimate. See our pricing page for typical ranges, and contact us for a free estimate that includes a complete spec and site assessment.