Artificial grass performs only as well as what lies beneath it. The infill, base preparation, and drainage system determine whether your turf will look natural, drain properly during Round Rock's flash-flood storms, resist odor in pet areas, and last for years without settling or developing bare spots. This guide walks homeowners through the materials and techniques that separate a durable installation from a shortcut job, and explains what to ask for in writing before any work begins.
Whether you are installing turf in a residential yard, a dog run, around a pool, or on a patio, the same principles apply: proper excavation, compaction, infill specification, and finishing detail. Understanding these steps helps you ask the right questions of any turf installation company and know what to expect from your finished yard.
Turf Infill Options: Silica, Coated Sand, Zeolite and Envirofill
Infill is the granular material spread across the turf after installation. It serves multiple purposes: it props up the synthetic grass fibres so they stand upright and feel natural underfoot, protects the turf backing from UV damage, adds weight to keep the turf in place during wind and heavy use, and helps water drain through the system. The type of infill you choose depends on the application and your priorities.
Silica sand is the most common and economical infill. It is angular, dense, and effective at ballasting the turf and supporting the fibres. It drains well and has been used in artificial grass installations for decades. Coated sand is silica sand that has been rounded and often colored or treated with antimicrobial compounds. The rounded edges are gentler on the turf fibres and reduce wear, and the coating can help with odor control in pet areas. Zeolite is a porous mineral that absorbs moisture and odors, making it popular for dog runs and pet turf where urine smell is a concern. It is often blended with sand rather than used alone. Cooling and antimicrobial coated infills, such as Envirofill, are engineered to reduce surface temperature and inhibit bacterial growth. These products cost more but may be worth the investment in high-use pet areas or climates where heat buildup is a concern. Crumb rubber (recycled tire material) is primarily used in sports fields and athletic courts where impact absorption is critical; it is not typical for residential yards because it retains heat, can migrate, and requires more frequent maintenance.
Most residential and pet installations use a blend of silica or coated sand with zeolite, chosen to balance cost, drainage, odor control, and durability. Your installer should specify the infill type and amount in writing before work begins.
How Much Infill Artificial Grass Needs, and Why
Infill quantity is specified in pounds per square foot (psf), and this number directly affects how well your turf performs. Typical residential installations call for 2 to 4 pounds per square foot, depending on the turf product, pile height, and intended use. Pet turf and high-traffic areas may require 3 to 5 psf or more. The infill amount serves several critical functions: it holds the fibres upright so they do not mat down or look thin, it protects the turf backing from direct sunlight (which degrades polyester and polypropylene), it provides weight so the turf does not shift during storms or heavy foot traffic, and it fills the space between fibres to help with drainage and odor control.
One of the most common shortcuts in cheap installations is under-filling. A crew that applies only 1 to 1.5 psf may finish faster and use less material, but the turf will look flat, the backing will degrade quickly from UV exposure, and pet odor will not be controlled. Within months, you may see the fibres beginning to separate and the turf backing becoming visible. Ask your installer for the infill specification in writing, including the type and the pounds per square foot. This number should match the turf manufacturer's recommendation for the specific product you have chosen. If an estimate does not include an infill specification, that is a red flag.
What to Put Under Artificial Grass for Drainage
The layers beneath artificial grass matter as much as the turf itself. A proper installation begins with removal of the existing lawn, dead sod, or old turf, along with roots and debris that would otherwise decompose and create voids below the surface. Once the area is cleared, excavation follows. The depth of excavation depends on site conditions and drainage requirements, but the goal is to create a stable, level or gently sloped base that sheds water away from structures.
After excavation, a weed barrier (landscape fabric) is laid in areas where weed growth is a concern, particularly in shaded spots or where the turf borders planting beds. The barrier prevents weeds from pushing through the turf while still allowing water to drain. Next comes the free-draining base material, typically 3 to 4 inches of decomposed granite, crushed limestone, or crushed base rock. This material is compacted in layers (called lifts) using a plate compactor or similar equipment. Proper compaction is essential: an uncompacted base will settle unevenly, creating dips and puddles that trap water and cause odor problems in pet areas.
For patios, balconies, hard surfaces, and pet areas, an additional drainage underlay or pad may be installed on top of the compacted base. This layer improves comfort underfoot, aids drainage on hard surfaces, and helps manage pet urine. On concrete or balcony decks, the turf is never glued flat to the slab; instead, an underlay is used and edge drainage is installed so water does not pool beneath the turf. The turf itself is then secured and seamed, and infill is spread and broomed into place.
Base Prep on Round Rock Soil: Excavation, Base Rock and Compaction
Round Rock's soil presents specific challenges for artificial grass installation. The area straddles the Balcones Escarpment, with older neighborhoods built on rocky, limestone-based soils that can be shallow and well-draining, while newer developments to the east sit on Blackland clay that holds water poorly and can become slick or compacted. Both conditions require thoughtful base preparation. If your yard has shallow rock or hardpan (a dense, cemented layer), excavation must break through or work around it. If your yard has clay soil that drains slowly, the base must be thicker and more carefully compacted to prevent water from pooling beneath the turf.
The standard approach is to excavate to a depth of 4 to 6 inches (depending on existing grade and drainage conditions), grade the base so it slopes gently away from your house and any pool or patio, and then install 3 to 4 inches of compacted base material such as decomposed granite or crushed limestone. This material is spread in layers and compacted firmly with a plate compactor. Each lift (typically 1 to 2 inches) is compacted before the next is added. Proper compaction creates a stable, load-bearing surface that will not settle or shift. An uncompacted base is a common cause of dips, puddles, and odor problems within the first year.
If your yard has a genuine water problem (standing water after rain, seepage toward the foundation, or a high water table), drainage must be addressed before turf is installed. This may involve grading, a French drain, or directing surface water away from the area. We will walk through the options with you, and if the water issue cannot be resolved with reasonable effort, we will recommend against installation. A well-draining base is the foundation of a successful artificial grass installation in Round Rock.
Artificial Grass Drainage and Underlay: Perforated vs Fully Permeable
Artificial grass itself is permeable, but the rate at which water passes through varies by product. This rate is measured in gallons per hour per square foot (GPH/sf). Most residential turf drains at 5 to 15 GPH/sf, which is fast enough for routine rain but may be tested during Round Rock's heavy downpours and flash storms. The turf's drainage rate depends on its backing type. Perforated backing has small holes punched through it, allowing water to flow through relatively quickly. Fully permeable backing (sometimes called microporous) is engineered to drain even faster by design of the material itself, rather than relying on holes. For most residential yards, a perforated backing is sufficient. For pet areas, playgrounds, and sports fields where drainage is critical, a fully permeable backing or a fast-draining product is preferred.
However, even the fastest-draining turf will fail if the base beneath it does not drain. This is why base preparation is so important. Water must be able to pass through the infill, through the turf backing, and into the compacted base material below. If the base is clay, uncompacted, or sloped toward the house, water will pool and create odor, mold, and soft spots. In pet areas, slow drainage is especially problematic because urine sits in the turf rather than draining away. Ask your installer for the drainage rate of the turf product in writing, and confirm that the base is graded and compacted to shed water away from structures.
For hard surfaces such as patios, decks, and balconies, a drainage underlay or pad is installed between the turf and the concrete or pavers. This underlay allows water to flow to the edges rather than pooling beneath the turf. Edge drainage (a channel or slope at the perimeter) ensures that water exits the installation and does not sit at the edges. Without these measures, water trapped under turf on a hard surface will eventually cause odor and deterioration.
Seams, Nails, Edging and Power Brooming
The quality of seams, nails, and edges is where craftsmanship becomes visible. Seams are the joints where two pieces of turf meet. A well-executed seam is nearly invisible and structurally sound. The process begins with careful grain alignment (the direction the fibres lie) so that both sides of the seam match. The seam is then joined using seam tape (a fabric strip) and seam adhesive applied to the backing on both sides. The tape is pressed firmly into place and allowed to cure. A poor seam is one where the grain is misaligned, the adhesive is insufficient, or the tape is not fully adhered. Over time, a weak seam will separate, lift at the edges, or allow water to seep underneath.
Securing the turf perimeter is equally important. The turf is fastened with nails or staples spaced at the correct intervals (typically every 6 to 12 inches around the perimeter and at seams). Nails that are too far apart or driven incorrectly will allow the turf to lift, especially during wind or heavy use. The edges are finished with bender board (flexible edging material) or a similar perimeter treatment that is secured to the ground and keeps the turf edge from curling or rolling up. On patios and around pavers, the turf is cut tight to the edges so no backing is exposed, and the cut is clean and secure.
After installation, the turf is power broomed or raked to stand the fibres upright and spread the infill evenly across the surface. This step restores the natural appearance and ensures that infill is distributed where it is needed. A visible seam, lifted edges, exposed backing, or matted-down fibres are signs that the installation was rushed or the installer lacked attention to detail. These issues often lead to accelerated wear and odor problems.
What a Written Turf Spec Should Include
Before any turf is delivered or installed, you should receive a written specification from your installer. This document protects you by making clear exactly what will be installed and how. A complete spec should include the following: the turf product name and fiber 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, the compaction method and standard, whether a weed barrier will be used, the seam method and tape type, the edging material and method, cleanup and haul-off of debris, and the workmanship warranty period (typically one to three years on the installation only, not on the turf product itself).
The spec should also note any site-specific conditions, such as whether excavation will be required, whether Texas 811 utility locates have been requested (always a good idea before digging), and whether any drainage measures are planned. If your yard has an HOA, the spec should confirm that the turf color, pile height, and edging comply with architectural guidelines. The spec is your reference if questions arise after installation, and it is your proof that the work was done to a stated standard.
Pricing varies based on site conditions, product choice, and the scope of base preparation required. Get a free estimate from Round Rock Turf Installation that includes an on-site measurement and a detailed written spec. Call (737) 345-9352 or visit our pricing page for more information on how we structure estimates and what to expect.