Artificial grass installed in Charleston needs to handle salt air, sandy and marshy soil, summer thunderstorms, and the occasional tropical downpour. The difference between turf that drains well and turf that holds water, smells, or settles unevenly starts long before the grass goes down. This guide walks through infill choices, base preparation, drainage design, and the finishing details that separate a solid installation from a shortcut job. It is written for homeowners and property managers in Charleston and the surrounding areas who want to understand what goes into the ground and why it matters.
A written specification that names the turf product, infill type, base depth, and compaction method protects you and ensures the installer knows what they are building. This guide gives you the vocabulary and the questions to ask, so you can verify any turf installer, including us.
Turf Infill Options: Silica, Coated Sand, Zeolite and Envirofill
Infill is the material spread across the turf surface after installation. It serves multiple purposes: it props up the grass fibres so they stand upright and look full, it protects the turf backing from ultraviolet light, it adds weight to keep the turf anchored, and it affects how quickly water drains through the system. The choice of infill depends on the use of the yard, the local climate, and the performance you want.
Silica sand is the most common and least expensive infill. It is angular, heavy, and does the job of ballast well. It works for most residential yards, but it can compact over time, and it does not offer any special benefit for pet areas or odor control. Coated sand is silica sand with a rounded surface coating. The coating makes it gentler on skin and pet paws, and it can be tinted to match the turf colour or add visual depth. Coated sand costs more than plain silica but is popular in residential yards where comfort and appearance matter. Zeolite is a porous mineral that absorbs and neutralizes ammonia and other odors. It is often blended with sand in pet turf and dog run applications because it helps manage the smell of urine over time. Zeolite infills are more expensive than sand alone. Antimicrobial and cooling coated infills, sold under brand names such as Envirofill, use specialized coatings to reduce bacterial growth or lower surface temperature. These are available as materials we can source, and they command a premium price. Crumb rubber (recycled tire material) is standard for sports fields and shock-absorbent play surfaces but is rarely used in residential yards because it breaks down faster, can track onto shoes and clothes, and is not necessary for a residential lawn or pet area.
How Much Infill Artificial Grass Needs, and Why
Infill is specified in pounds per square foot, and the amount matters more than homeowners usually realize. The right amount of infill keeps the grass fibres standing upright and full, protects the backing from sun damage, provides the weight needed to keep the turf anchored in wind, and supports proper drainage by allowing water to flow through rather than pooling on top. Too little infill is one of the most common shortcuts in cheap installations: the turf may look acceptable at first, but the fibres will mat down quickly, the backing will degrade from UV exposure, and the turf will shift and wrinkle underfoot.
Typical residential turf requires between 1.5 and 3 pounds of infill per square foot, depending on the product, pile height, and intended use. Pet turf may call for a higher rate to maximize odor control and durability. Playground and school turf is often specified with more infill for safety and performance. When you get a quote, ask for the infill amount in writing as part of the specification. If an installer cannot or will not name the figure, that is a red flag.
What to Put Under Artificial Grass for Drainage
The foundation under artificial grass determines how well it drains, how long it lasts, and whether odors build up or escape. The process starts with removal: the existing lawn, dead sod, roots, and any old turf must be cleared away. If the soil underneath is compacted clay or stays soggy after rain, excavation may be necessary to expose better-draining layers or to create the grade needed to shed water away from the house and any pool. Once the area is cleared and graded, a weed barrier (a permeable landscape fabric) is laid down. It prevents weeds from pushing through the turf and roots from the surrounding landscape from invading the base, but it allows water to pass through. A high-quality weed barrier is especially important in Charleston, where moisture and warmth encourage aggressive plant growth.
Next comes the base layer, typically 3 to 4 inches of decomposed granite or crushed base rock (often called crusher run or recycled asphalt). This material compacts well, drains freely, and provides a stable, level surface for the turf. The base must be compacted firmly in lifts (thin layers) with a plate compactor to prevent settling, which causes dips, puddles, and areas where water pools and odor accumulates. For patios, balconies, and turf-paver strips, or for pet areas where drainage is critical, an optional draining underlay or pad is installed over the compacted base. This layer adds cushioning and improves drainage further. Finally, the turf is unrolled, seamed, and secured. On concrete or hard surfaces, turf is never glued flat directly to the slab, because water will pool underneath and the turf will fail; instead, a draining underlay is used and edge drainage is provided.
Base Prep on Charleston Soil: Excavation, Base Rock and Compaction
Charleston soil is typically sandy near the surface and transitions to clay, silt, and shell layers deeper down. The high water table and frequent heavy rain mean that poorly prepared bases become soggy, soft, and unstable. A base that has not been properly excavated and compacted will settle unevenly, creating dips and soft spots where water pools, and where odor from pet urine or standing moisture accumulates. This is one of the most common failures in artificial grass installations.
The proper sequence is excavation to remove topsoil and reach stable subgrade, grading with a fall (slope) away from the house and pool so water sheds rather than collecting, removal of any debris or roots, and then installation of 3 to 4 inches of compacted base material, typically decomposed granite or crushed base rock. The base must be compacted in thin lifts with a plate compactor, not simply spread and left loose. Compact base is firm enough that you can walk on it without sinking and without seeing your footprint. If the yard has a real water problem (standing water after heavy rain, a high water table, or poor drainage that persists even after grading), the drainage issue must be addressed before turf is installed, or the job will be declined. In those cases, a qualified drainage contractor may need to install a French drain, dry well, or other system. Before any excavation, South Carolina 811 should be called for a utility locate to mark public lines; private lines such as irrigation, low-voltage lighting, and pet-fence wires are your responsibility to locate and protect.
Artificial Grass Drainage and Underlay: Perforated vs Fully Permeable
Artificial grass itself drains quickly if the product is chosen well, but drainage is a system, not just a single layer. The turf backing is either perforated (with small holes punched through) or fully permeable (a woven or non-woven material that allows water to flow through its entire surface). Drainage rate is measured in gallons per hour per square foot. A turf with a perforated backing might drain at 60 gallons per hour per square foot, while a fully permeable backing can drain at 100 gallons per hour or more. In Charleston, where afternoon thunderstorms are common and tropical systems can dump several inches in an hour, a fast-draining turf is important. However, even the best turf will fail if the base underneath does not drain as fast or faster.
For pet areas, drainage speed is critical because standing water traps urine and accelerates odor. For patios and balconies, an optional underlay or pad is installed between the base and the turf to improve drainage and add comfort underfoot. These pads are typically 3/8 to 1/2 inch thick and may have a backing that wicks water away from the turf surface. On hard surfaces such as concrete, edge drainage (a perimeter drain or sloped edges) is essential so water does not pool at the edges. When you review a turf specification, ask for the drainage rate of the backing in writing, and verify that the base material and compaction method support that drainage rate. A fast-draining turf on an uncompacted or poorly graded base will still hold water and fail.
Seams, Nails, Edging and Power Brooming
The finishing details separate a professional installation from a rushed one. Seams are the joints where two pieces of turf meet. A good seam is joined with seam tape (a thin, permeable adhesive strip) and a flexible polyurethane or latex adhesive applied underneath. The grain (the direction the fibres lean) must be aligned across the seam so the nap looks uniform. A visible seam line, a gap, or fibres that are misaligned tells you the seam was not done carefully. Seams should be nearly invisible from a few feet away. Nails or staples anchor the turf around the perimeter and at intervals across the field. Spacing and fastener type depend on the turf weight and local wind exposure, but proper fastening prevents the turf from shifting or wrinkling. Edging is the perimeter finish. Common choices include landscape bender board (flexible plastic or metal edging), aluminum trim, or a secured perimeter that is nailed or stapled down. The edge must be clean and secure so the turf does not lift or fray, and it should be tight to pavers, patios, or pool decks so water does not pool underneath. On pool surrounds, edges must be especially tight and stable for safety and drainage.
Power brooming is the final step. After the turf is laid and before it is fully settled, a power broom (a stiff rotary brush) is run over the surface to stand the fibres upright and to spread and settle the infill evenly. This step improves the appearance, ensures infill is distributed uniformly, and helps the turf bond with the base. A turf that is not power broomed will look thin and matted initially and will perform poorly. A lifted edge, a visible seam, or wrinkles in the turf are signs that the installation was not finished properly or that the base was not compacted enough to support the turf weight.
What a Written Turf Spec Should Include
Before any work begins, you should receive a written specification that details exactly what will be installed. This spec protects you, ensures the installer understands the scope, and gives you a reference if questions arise after the work is complete. A complete spec includes the following: the turf product name and fibre type (polyethylene, polypropylene, or nylon), the face weight in ounces per square yard, the pile height in millimeters, the backing type (perforated or fully permeable) and its drainage rate, the infill type and amount in pounds per square foot, the base material (decomposed granite, crushed base rock, or other), the base depth in inches and compaction method (plate compactor, number of passes), whether a weed barrier will be installed, the seam method and tape type, the edging material and method, cleanup and haul-off of old turf or debris, and the workmanship warranty period (typically one to three years on the installation only).
Ask for the spec in writing before you commit. If an installer cannot provide a detailed written spec, or if they offer a vague quote with no product details, that is a reason to look elsewhere. A local, independent turf installation company will name the product, the face weight, the infill, and the base depth because that is how they ensure quality and stand behind their work. For a free on-site estimate and a written specification tailored to your yard, contact Charleston Artificial Grass Installation at (843) 994-2258. For typical pricing ranges, see our pricing page.