Artificial grass looks good on a sunny day, but what matters is what happens underneath. The infill, the base, the drainage system and the way seams are finished determine whether your turf stays in place, drains properly, resists odor and lasts. This guide walks through the decisions and specifications that separate a durable installation from one that fails within a few years. Whether you are installing turf in a residential yard, a pet area, around a pool or on a commercial property in Oklahoma City and the surrounding areas, understanding these fundamentals will help you ask the right questions and know what to expect.
Oklahoma City sits on red clay prairie that drains poorly in heavy rain and cracks in drought. That soil is why base preparation and drainage are not optional here. This guide covers infill materials and how much to specify, what to excavate and compact underneath, how backing and underlays work, and what a written specification should include so you know exactly what is being installed.
Turf Infill Options: Silica, Coated Sand, Zeolite and Envirofill
Infill is the material spread across the turf after installation. It sits in the fibres, props them upright, protects the backing from ultraviolet light, adds weight to keep the turf in place, and plays a role in drainage and odor control. The most common infill is silica sand, a natural mineral ballast that is affordable and effective. Silica is angular and dense, which means it stays in place and does the job, but it can feel harder underfoot than some alternatives.
Coated sand is silica that has been rounded and often coloured or treated. Rounding makes it gentler on the skin and the turf fibres, and coating can add color stability and reduce dust. Zeolite is a porous mineral that absorbs moisture and odors, making it popular for pet areas and dog runs where smell is a concern. Antimicrobial and cooling coated infills, such as Envirofill, combine mineral bases with treatments designed to inhibit bacteria growth and lower surface temperature. These products cost more than plain silica but offer benefits in high-traffic and high-heat environments. Crumb rubber, made from recycled tires, is used primarily on sports fields and playgrounds where impact absorption and performance matter more than residential comfort. For most Oklahoma City homes, a combination of silica or coated sand with zeolite in pet areas is the standard approach.
The choice of infill depends on the use, the climate and your priorities. Ask your installer which infill they recommend for your specific application and why, and request the type and amount in writing before work begins.
How Much Infill Artificial Grass Needs, and Why
Infill is specified by weight, measured in pounds per square foot. A typical residential turf might call for 2 to 4 pounds per square foot, depending on the product, the pile height, the fibre type and the intended use. Pet turf and play areas often run higher, sometimes 4 to 6 pounds per square foot or more, because the extra weight helps the turf stay flat under foot traffic and keeps infill from migrating. The infill serves multiple purposes: it holds the fibres upright so they look full and perform well, it shields the backing from UV degradation, it adds weight that anchors the turf against wind and movement, and it participates in drainage by creating pathways for water to flow through.
A common shortcut taken by low-cost installers is to under-fill the turf. Too little infill leaves the fibres limp and exposed, the backing vulnerable to sun damage, and the turf prone to shifting. Within a season or two, an under-filled installation looks thin and worn, and seams may lift because the turf lacks weight to hold it down. Conversely, overfilling can compact the base and reduce drainage. The right amount is a balance, and it depends on the product specification. Ask your installer for the infill amount in pounds per square foot in writing, and ask them to explain why that figure is appropriate for your turf product and your use case. A specification that names the infill type and the exact weight per square foot is a sign of a professional installation.
What to Put Under Artificial Grass for Drainage
The foundation under artificial grass determines how well it drains, how long it lasts and how stable it remains. The process starts with removal. If you have an existing lawn, it must be removed entirely, including roots and thatch, because decomposing organic matter beneath the turf will create voids, odor and uneven settling. If old turf is being replaced, it is removed completely and the base is inspected and prepared fresh. Once the area is cleared, excavation begins. The depth depends on your soil, the intended use and the drainage challenge, but typically the base layer is 3 to 4 inches of compacted material.
The sequence is: excavate to grade, lay a weed barrier if appropriate (commonly used on residential yards to slow weed growth from below), then install a free-draining base of decomposed granite or crushed base rock. This material must be compacted in lifts using a plate compactor, which means spreading a layer, compacting it firmly, adding another layer and repeating until you reach the target depth and density. An uncompacted base is a false economy. Without compaction, the base settles unevenly, creating dips and puddles that hold water and cause odor problems, especially in pet areas. For patios, balconies, pool surrounds and other hard surfaces, the sequence is different: if the surface is concrete or pavers, a draining underlay or pad is laid over it before the turf, and edge drainage is installed so water does not pool at the perimeter. Turf should never be glued flat to a concrete slab that holds water. For pet areas and play zones, an optional draining underlay or foam pad can be added above the base to improve comfort and drainage. The turf is then laid over the complete assembly, seamed, nailed and infilled.
Base Prep on Oklahoma City Soil: Excavation, Base Rock and Compaction
Oklahoma City's red clay soil drains poorly and compacts hard when wet, then cracks when dry. This soil is why base preparation is not a detail here, it is the foundation of durability. When artificial grass is installed over unprepared clay, water sits on the surface instead of percolating through, creating puddles, odor and soft spots where the turf shifts underfoot. Proper base prep means excavating the existing lawn and root layer, then grading the subgrade with a slight fall away from the house and any pool or structure so water runs off. The excavated area is then filled with 3 to 4 inches of compacted decomposed granite or crushed base rock. This material is free-draining, meaning water passes through it readily instead of pooling on top.
Compaction is the critical step that most cheap installations skip. The base must be compacted in lifts, typically two or three layers, using a plate compactor that weighs several hundred pounds. Each lift is spread, compacted firmly until it is dense and stable, then the next lift is added. A properly compacted base is firm underfoot and does not settle unevenly. An uncompacted base feels soft, develops dips where water collects, and allows infill to migrate down into voids. Over time, the turf sags, seams lift and odor develops. If your yard has poor drainage or standing water after rain, the base preparation is more involved. Grading may need to be more aggressive, or a drainage system may need to be installed. If a yard has a persistent water problem, we address the drainage first or the job is not the right fit. A successful installation in Oklahoma City begins with a properly excavated, graded and compacted base.
Artificial Grass Drainage and Underlay: Perforated vs Fully Permeable
Artificial turf has a backing, and the backing comes in two types: perforated and fully permeable. Perforated backing has small holes punched through it, which allows water to drain through relatively quickly. Fully permeable backing is a porous material that water passes through evenly across its entire surface. Drainage performance is measured in gallons per hour per square foot, and faster-draining products (typically 8 to 12 gallons per hour per square foot or higher) are better for pet areas and heavy-use zones where water and odor are concerns. A slower-draining product might be adequate for a low-traffic patio or a putting green where surface water is not a problem.
However, the backing is only half the story. A fast-draining turf installed on a poorly prepared base will still fail. If the base is uncompacted or the subgrade does not slope away from the house, water pools on top of the base and sits there, creating odor and soft spots. The turf itself drains quickly, but the water has nowhere to go. For this reason, base preparation and backing drainage work together. For hard surfaces such as concrete patios, balconies and pool decks, a draining underlay or foam pad is installed between the turf and the hard surface. This underlay is perforated or porous and allows water to drain sideways to the edges, where it runs off. Without an underlay, water sits between the turf and the concrete, and the turf becomes a sponge. In Oklahoma City, where summer thunderstorms can drop an inch of rain in minutes, a turf with a fast-draining backing and a properly prepared base is the difference between a yard that drains in hours and one that smells of wet grass and pet waste for days.
Seams, Nails, Edging and Power Brooming
How seams are finished and how edges are secured separate a professional installation from a quick one. Seams are the joints where two pieces of turf meet. A proper seam is joined with seam tape and adhesive, applied underneath the turf so the joint is invisible from above. The grain of the turf (the direction the fibres lean) must be aligned on both sides of the seam so the color and texture match. If the grain is misaligned, the seam is visible as a stripe or a shadow even if the joint itself is tight. Seaming is a skill that takes practice. A seam that is visible or that separates and lifts at the edges is a sign that the installer did not take time to align the grain or apply the adhesive correctly.
Nails or staples hold the turf down around the perimeter and at seams. They must be spaced properly (typically 6 to 12 inches apart depending on the product and the expected stress) and driven flush so they do not catch the fibre or create a trip hazard. Edges are finished with bender board, landscape edging or a secured perimeter so the turf does not curl or fray. At pavers and hard surfaces, the turf is cut tight to the edge so there is no gap or overhang. At pools and water features, edges must be secured so foot traffic and water movement do not lift them. After the turf is nailed and edged, power brooming is performed. A power broom is a mechanical brush that stands the fibres up, spreads the infill evenly and gives the turf a finished appearance. Without power brooming, the turf looks flat and matted. A yard that is ready for use has seams that are invisible, edges that are secure and tight, and fibres that stand upright and full.
What a Written Turf Spec Should Include
Before any work begins, ask for a written specification that names exactly what will be installed and how. A proper spec is a contract document that protects you and holds the installer accountable. It should include the turf product name and fibre type (for example, polyethylene 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 the amount in pounds per square foot, the base depth and base material (for example, 3.5 inches of compacted decomposed granite), whether a weed barrier will be installed, the seam method and the edge treatment, and the scope of cleanup and haul-off. The spec should also state the workmanship warranty period, which covers the installation labor and seams (typically one to three years). Manufacturer warranties on the turf product itself are separate and are the turf maker's responsibility, not the installer's.
A written spec also protects you from surprises and substitutions. If the installer later claims the turf was not available and substitutes a cheaper product, or if they reduce the infill to save money, you have a document to point to. Ask for the spec in writing before you sign a contract, review it carefully, ask questions about any line item you do not understand, and keep it for your records. If an installer resists putting the details in writing or claims it is not necessary, that is a red flag. A professional turf installation company names the product, the face weight, the infill and the base depth because they are confident in their work and they want you to know what you are getting. For pricing and a free estimate with a written spec, contact Oklahoma City Turf Installation at (405) 719-2648 or request a site visit to discuss your project in detail.