Artificial grass performs only as well as what lies beneath it. Infill, base preparation, drainage, and finishing details determine whether your turf stays level and odor-free for years, or develops dips, puddles, seams that lift, and pet odor that lingers. This guide walks you through each layer of a proper installation, from soil excavation through compaction, infill selection, and the seams and edges that separate a real job from a rushed one. Whether you are installing turf in a Chula Vista backyard on clay mesa soil, a pet run that needs to shed water and odor, or a pool surround on a tight terraced lot, understanding these fundamentals will help you ask the right questions and spot the shortcuts that cheaper installers take.
The Chula Vista area spans diverse soil types and drainage conditions, from expansive clay on the inland mesas to sandier ground near the bay, and from level backyards to steep canyon-edge terraces where water management is critical. A yard that turns to dust in summer or mud in winter, a dog area that smells no matter how often you rinse it, or turf that lifts at the seams usually points back to one of these layers. This guide covers what goes under artificial grass, how much infill it needs, why base compaction matters, and what a written spec should promise.
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 fibres so they stand upright and feel natural underfoot, protects the backing from ultraviolet light, adds weight to keep the turf from shifting, and plays a role in drainage and odor control. The choice of infill depends on the use and the climate, and it should always be specified in writing before the job begins.
Silica sand is the most common and economical infill. It is angular or rounded, typically in the range of 40 to 100 mesh size, and serves as the basic ballast and drainage medium. Coated sand uses silica particles coated with a polymer or mineral layer, which makes them smoother, gentler on bare feet, and often coloured to match or complement the turf. Zeolite is a porous mineral that absorbs and neutralizes ammonia and other odorous compounds, making it popular for pet areas and dog runs. Antimicrobial and cooling coated infills are engineered to reduce bacterial growth and lower surface temperature in hot climates. Products such as Envirofill fall into this category and can be sourced for installations where odor control or heat mitigation is a priority. Crumb rubber (recycled tire rubber) is an infill used mainly in sports fields and athletic courts because it provides impact cushioning; it is not typical for residential yards.
The infill you choose affects how the turf feels, how well it handles pet odor, how quickly it drains, and how hot the surface becomes in direct sun. A proper installation uses the infill specified for the product and the application, applied at the correct depth and density. Cheap installations often skimp on infill amount or use a single-layer approach that fails to deliver the performance promised.
How Much Infill Artificial Grass Needs, and Why
Infill is specified by weight, measured in pounds per square foot (psf). Typical residential turf installations call for 1.5 to 3 psf of infill, though the exact amount depends on the pile height, face weight, and intended use of the turf. A putting green or a high-performance sports surface may require more; a light-duty patio or balcony may use less. The infill amount is not arbitrary: it is calculated to prop up the fibres at their designed height, protect the backing from UV degradation, and allow proper drainage and odor control.
Too little infill is one of the most common shortcuts in low-cost installations. When infill is sparse, the fibres mat down, the backing is exposed to sun and degrades faster, drainage and odor control suffer, and the turf feels thin and unnatural. When infill is too heavy, the turf can become dense and hot, and drainage may slow. The right amount, applied evenly and broomed in, is what separates a durable installation from one that fails within a few years. Always ask your installer for the infill specification in writing, including the type, the density in pounds per square foot, and the depth to which it will be distributed. This figure should be part of your written spec before work begins.
What to Put Under Artificial Grass for Drainage
The layers under artificial grass are as important as the turf itself. The process begins with removal: the existing lawn, dead sod, or old turf must be stripped away, along with roots and debris that could trap moisture or create uneven settling. Once the surface is clear, the ground is excavated to the depth needed for the base material, typically 3 to 4 inches on a residential yard. The excavation is graded so that water flows away from the house and any pool or patio, preventing water from pooling under the turf.
Next comes the base layer, usually composed of decomposed granite or crushed base rock (also called crusher dust or class II base). This material compacts firmly, drains quickly, and provides a stable, level surface for the turf. The base is laid in lifts (usually 2 inches at a time) and compacted with a plate compactor to achieve firm, even density. A weed barrier fabric is sometimes laid between the excavated soil and the base to prevent weeds from growing up through the turf, though this is not always necessary depending on the site conditions. After the base is compacted and level, an optional drainage underlay or cushioning pad may be installed, especially for pet areas, play spaces, or hard surfaces such as patios and balconies. Finally, the turf is rolled out, seamed, and infill is applied.
On concrete, balconies, or other hard surfaces where water cannot drain into the ground, turf must never be glued or adhered flat to the slab. Instead, a perforated drainage underlay or pad is laid first, the turf is installed over it, and edge drainage (such as a perimeter channel or draining trim) is provided so water runs off and does not pool beneath the turf.
Base Prep on Chula Vista Soil: Excavation, Base Rock and Compaction
Chula Vista soil varies widely across the city. The inland mesas and hillside neighborhoods such as Rancho del Rey and Otay Ranch sit on expansive clay that compacts hard and drains poorly. The lower west side near the bay and Castle Park has sandier, more porous soil. The terraced neighborhoods such as Eastlake and Rolling Hills Ranch often have mixed soil on cut-and-fill slopes. All of these conditions require proper base preparation to prevent the turf from settling unevenly, collecting water, or developing odor problems.
Base prep begins with excavation to remove the existing lawn or old turf down to firm soil, typically 3 to 4 inches deep depending on the site. The excavated area is then graded so that the surface slopes gently away from the house, pool, and any structures, allowing water to run off rather than collect. On clay soil, which is common on Chula Vista's mesas, the excavation may need to be deeper and the base material thicker to ensure adequate drainage. Decomposed granite or crushed base rock is then spread in lifts of about 2 inches and compacted firmly with a plate compactor. Each lift must be compacted before the next is added. A properly compacted base feels solid underfoot and resists settling.
An uncompacted or poorly compacted base causes the turf to settle unevenly, creating dips and soft spots where water pools. Pooled water under the turf prevents drainage, traps odor, and can eventually cause the turf backing to degrade. If a yard has a genuine water problem (standing water, poor drainage, or a high water table), drainage must be addressed first through grading, subsurface drainage, or other means. If the site conditions cannot support proper drainage, the installation cannot proceed responsibly.
Artificial Grass Drainage and Underlay: Perforated vs Fully Permeable
Drainage happens in two places: through the turf and its backing, and through the base beneath it. The turf's drainage rate is specified in gallons per hour per square foot (GPH/sf), and it tells you how quickly water passes through the synthetic fibres and backing. A typical residential turf drains at 15 to 30 GPH/sf or faster. Perforated backing has small holes punched through it, allowing water to flow through at a controlled rate. Fully permeable backing is porous throughout and drains even faster, with minimal resistance. Both types work well when the base underneath drains properly.
The real test of drainage is what happens during heavy rain or when you rinse a pet area. If the base is compacted firmly and slopes away from the house, water moves through the turf and base quickly and does not collect. If the base is loose, uncompacted, or flat, water pools under the turf even if the turf itself drains fast. This is why base preparation and grading are as critical as the turf's drainage rating. For pet areas, play spaces, and any application where water accumulation is a concern, an additional drainage underlay or pad can be installed under the turf. These products are perforated or fully permeable and sit between the turf and the base, creating an extra drainage channel. On hard surfaces such as concrete patios or balconies, a draining underlay is essential because water cannot percolate into the ground; instead, it must run off at the perimeter through an edge drain or trim system.
When specifying your turf, ask for the backing type and drainage rate in writing. Verify that the base will be compacted and graded for drainage. If your yard has heavy clay soil or a history of water problems, discuss whether an underlay is needed. A fast-draining turf on a poor base is still a poor installation.
Seams, Nails, Edging and Power Brooming
The finishing details of an installation reveal whether the work was done carefully or rushed. Seams are the joints where two pieces of turf meet. A properly seamed joint uses seam tape (a specialized adhesive-backed fabric) and a waterproof seam adhesive applied underneath. The two pieces are aligned so that the pile (the synthetic fibres) runs in the same direction across the seam, creating a uniform appearance. The seam is then power broomed to blend the fibres and infill across the joint. A visible seam, a raised edge, or fibres running in different directions at a seam are signs of careless work.
Edges are the perimeter where the turf meets the surrounding landscape, patio, or fence. Proper edging uses bender board (a flexible metal or plastic trim) secured with nails or stakes, or alternatively a secured perimeter that holds the turf edge in place and prevents it from fraying or rolling back. The turf is cut cleanly and fitted tight to pavers, pool coping, and other hard surfaces so that water drains away and no gaps collect debris. Nails or staples are spaced at the correct intervals (typically every 6 to 12 inches along the perimeter) to keep the turf from shifting in heat or under foot traffic.
Power brooming is the final step. A power broom is a machine with rotating bristles that stands up the synthetic fibres, spreads infill evenly, and creates a uniform, manicured appearance. Without power brooming, the turf looks flat and uneven, and infill is concentrated in some areas and thin in others. A turf installation without proper seaming, edging, and brooming will fail sooner and look worse from the start.
What a Written Turf Spec Should Include
Before any work begins, you should receive a written specification that details every layer and material in your installation. This spec is your protection and your reference if questions arise later. It should include the turf product name and fibre type (polyethylene, polypropylene, or nylon), the face weight (ounces per square yard), the pile height (length of the fibres in inches), the backing type (perforated or fully permeable), and the drainage rate in gallons per hour per square foot. It should specify the infill type (silica, coated sand, zeolite, or other) and the amount in pounds per square foot. It should state the base material (decomposed granite, crushed rock, etc.), the depth in inches, and the compaction method. It should note whether a weed barrier will be used, how seams will be joined, what edging will be installed, and whether the turf will be power broomed. The spec should include cleanup and haul-off of old turf and debris, and the workmanship warranty period (typically one to three years on the installation only).
A written spec is not a sales document; it is a contract that holds both you and the installer accountable. It prevents misunderstandings about what will be installed and what will not. It allows you to compare quotes fairly and to verify that the work was done as promised. Any reputable turf installation company will provide this spec before work begins. If an installer refuses to put the details in writing or offers only a vague estimate, that is a warning sign. For residential installations, pet turf, putting greens, pool surrounds, and other applications, the spec is the foundation of the job. Contact us for a free estimate and a detailed written spec tailored to your yard and your needs. Visit the pricing page for an overview of what to expect.