Artificial grass installation depends on what lies beneath it. The base, the infill, the drainage path, and the finishing details determine whether your turf stays level, drains properly after a Gulf Coast downpour, resists odor in a pet area, and holds its seams tight for years. This guide walks you through each layer and the decisions that matter in Brownsville's flat delta soils and humid climate, so you can ask the right questions of any installer and understand what you are paying for.
Whether you are converting a lawn that has died in the heat, preparing a dog run that turns to mud, or finishing a patio or pool surround, the work below ground is as important as the turf you see. A homeowner who understands infill, base compaction, and drainage can spot the shortcuts that cheap installers take, and can verify that the installer you choose has built the foundation for a turf that will perform.
Turf Infill Options: Silica, Coated Sand, Zeolite and Envirofill
Infill is the loose material that sits on top of the turf backing and between the fibres. It serves multiple purposes: it props the grass blades upright so they look full and natural, it protects the backing from ultraviolet light, it adds weight to keep the turf from moving, and it plays a role in drainage and odor control. The choice of infill depends on the use of the turf and the performance you need.
Silica sand is the most common and least expensive infill. It is angular, compacts firmly, and does the job of ballast and UV protection. It does not offer odor control or cooling, but it works well for general residential yards and is easy to top up if some migrates over time. Coated sand uses rounded grains, often with a polymer or mineral coating, and is gentler on the turf fibres and on bare feet. Some coated sands are tinted to match the turf colour and give a more finished look. Zeolite is a porous mineral that absorbs ammonia and moisture, making it popular for pet turf and dog runs where odor control matters. It is often mixed with sand or used as a top layer. Antimicrobial and cooling coated infills, sold under brand names such as Envirofill, combine mineral or polymer coatings with additives that inhibit bacterial growth or help dissipate heat. These products cost more but are chosen when odor, pet safety, or heat reflection are concerns. Crumb rubber (recycled tire material) is standard in sports fields and gym turf because of its shock absorption and durability, but it is rarely used in residential yards and is not typical for pet areas or patios.
How Much Infill Artificial Grass Needs, and Why
Infill is measured in pounds per square foot (psf), and the amount specified for your turf is one of the most important details on a written installation spec. A typical range for residential turf is 3 to 5 pounds per square foot, but the exact figure depends on the turf product, its pile height, and its intended use. Pet turf and play areas often call for 4 to 6 psf to ensure the fibres stay upright under foot traffic and to hold odor-control infill. A higher face weight (the weight of the fibre alone) may call for a lower infill amount, while a lighter, finer turf may need more infill to perform well.
Infill does three critical jobs: it holds the fibres erect so the turf looks full and feels natural underfoot, it shields the backing from UV damage that causes brittleness and failure, and it adds weight to anchor the turf and help it drain. Too little infill is a common shortcut taken by cheap installers. A turf laid with 2 pounds per square foot or less will mat down, show the backing, drain poorly, and fail early. When you get a quote, ask for the infill amount in writing and verify it matches the turf manufacturer's recommendation. If an installer will not specify the amount, that is a red flag.
What to Put Under Artificial Grass for Drainage
The layers under artificial grass create the path for water to drain away and the stable base that keeps the turf level. The process starts with removal: the old lawn, dead sod, weeds, and roots must come out. On a yard with established grass or an old turf installation, excavation removes the top 2 to 3 inches of soil and organic matter that would otherwise compact, hold water, and cause the new turf to settle unevenly. Once the site is cleared, the installer grades the ground to slope slightly away from the house and any pool or patio, so water runs off rather than pooling.
Next comes the base material, typically 3 to 4 inches of decomposed granite, crushed limestone, or recycled asphalt base rock. This is compacted firmly in lifts (layers) using a plate compactor or similar equipment. Compaction is essential: an uncompacted base will settle over time, creating dips and low spots where water pools, odor builds, and the turf becomes uneven. In areas with heavy shade, poor drainage, or standing water problems, a weed barrier (landscape fabric) is laid before the base to prevent weeds from growing up through the turf. After the base is compacted and level, an optional draining underlay or pad may be installed, especially for pet areas, patios, or play spaces where extra cushioning or odor control is wanted. Finally, the turf is laid on top. On hard surfaces such as concrete, balconies, or rooftops, the process is different: a draining underlay or specialized pad is laid directly on the slab, edge drainage is installed to route water away, and the turf is secured without being glued flat, so water can flow through rather than pooling on an impermeable surface.
Base Prep on Brownsville Soil: Excavation, Base Rock and Compaction
Brownsville sits on the flat delta of the Rio Grande, where the soil is dense, silty clay that holds water after heavy rain. This soil type is the main reason base preparation is not optional. If you dig a hole in a typical Brownsville yard and it fills with water, that is the soil at work. When artificial grass is laid directly on this clay or on compacted native soil without proper excavation and drainage, water has nowhere to go. It sits under the turf, the infill becomes soggy, odor develops (especially in pet areas), and the turf backing can rot or shift.
Proper base prep means excavating 3 to 4 inches of the native soil and clay, grading the bottom of the excavation to slope away from the house and pool, and then filling it with a free-draining base material such as decomposed granite or crushed base rock. This material is compacted firmly in 1 to 2 inch lifts using a plate compactor, so it becomes a stable, load-bearing foundation that does not settle. The compaction is the key: a loose base will compress under foot traffic and cause the turf to become uneven and develop low spots where water pools. If the yard has a history of standing water, flooding, or poor drainage, the base excavation may need to be deeper, and a perforated drain pipe or swale may be needed to route water away from the property. In those cases, drainage is fixed first, or the job is declined. If you are unsure whether your yard has a drainage problem, ask the installer to assess it before committing. A good installer will tell you if the site needs more work than a standard base prep.
Artificial Grass Drainage and Underlay: Perforated vs Fully Permeable
Artificial grass drains through its backing. The backing is the underside of the turf, and it can be either perforated (punched with small holes) or fully permeable (a porous material that lets water flow through). Drainage rate is specified in gallons per hour per square foot (GPH/sf). A typical residential turf backing drains at 3 to 8 GPH/sf, meaning a square foot of turf lets 3 to 8 gallons of water pass through in an hour. A pet turf or a turf in an area prone to heavy rain may be specified with a higher drainage rate, 10 GPH/sf or more, to handle downpours and frequent watering without saturation.
However, fast-draining turf fails on a base that does not drain. If the base is uncompacted, settling, or sits on clay that holds water, the water that passes through the turf backing has nowhere to go. It pools under the turf, and the infill stays wet, leading to odor, algae growth, and turf failure. This is why base prep and turf drainage work together. For patios, balconies, and other hard surfaces, an underlay or drainage pad is installed under the turf to create an air gap and route water to the edge, where it drains away. On a concrete slab or deck, turf should never be glued flat to the surface, because water will trap underneath and cause the backing to fail. When you ask about drainage, request the GPH/sf figure in writing, and ask whether the base material and compaction are suitable for your soil and the rainfall in your area. Ask to see how water will be routed away from the edges.
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 well-executed seam is joined with seam tape and a flexible adhesive, with the grain of the turf aligned so the nap runs the same direction on both sides of the seam. When done correctly, a seam is nearly invisible and stays tight. A visible seam, a seam that is raised or curling, or a seam that separates tells you the work was not done carefully. Nails or staples hold the turf at the perimeter and at seams, spaced at regular intervals (typically 4 to 6 inches) and driven flush so they do not catch or pull loose. Loose or missing fasteners cause the edges to lift, especially in heat or after heavy rain.
Edging is the boundary between the turf and the surrounding surface. Clean, tight edging prevents the turf from fraying and keeps infill from migrating onto patios or walkways. Common edging methods include bender board (flexible plastic or aluminum edging), landscape edging, or a tight cut along pavers or concrete. On a patio or pool surround where turf meets pavers, the turf should be cut tight to the edge so water can drain between the turf and the paver without trapping soil or infill. Power brooming is a final step: a stiff-bristled rotary brush is run over the entire turf surface to stand the fibres upright, spread the infill evenly, and give the turf a full, finished appearance. A turf that has been power broomed looks noticeably fuller and more natural than one that has not. If you visit a finished installation and the turf looks flat or matted, or if you see infill piled unevenly, that is a sign the finishing work was skipped.
What a Written Turf Spec Should Include
Before any work begins, you should have a written specification that lists every material, measurement, and method the installer will use. This spec is your protection and your reference if questions arise. A complete written spec includes 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 and its drainage rate in gallons per hour per square foot, the infill type and amount in pounds per square foot, the base material and depth (typically 3 to 4 inches), the base compaction method, whether a weed barrier will be used, the seam method and location, the edging type and method, cleanup and haul-off of old material, and the workmanship warranty period (typically one to three years on the installation only). The spec should also note any site-specific details, such as grading for drainage, removal of old turf, or special underlay for a pet area or patio.
A professional turf installation company will provide this spec in writing and will measure your site carefully to give you accurate square footage and pricing. If an installer gives you a price per square foot over the phone without seeing the yard, or refuses to put the spec in writing, move on. The spec is also your tool for comparing quotes: two installers quoting different prices may be specifying different infill amounts, base depths, or turf products, and the spec tells you why. For a free estimate and a written spec tailored to your yard, contact us with photos or a description of the site, and we will schedule an on-site measurement. Once you have the spec, review the pricing page to understand the range and what drives cost, then call (956) 338-4164 with questions.