Artificial grass looks simple from the yard side, but what lies beneath the turf determines whether it drains well, lasts, stays odor-free in a dog run, or develops puddles after a monsoon. This guide walks through the materials and methods that separate a well-built installation from one that fails in Gilbert's heat and summer storms. Whether you are replacing a bermuda lawn burned out by June heat, fixing a dog run turned to mud and odor, or preparing a yard for a move-in, understanding infill, base prep and drainage helps you ask the right questions and spot the shortcuts.
Gilbert spreads across former farmland with hard desert soil and caliche that does not drain naturally. The base layer, the infill, the seams and the underlay all work together to handle 115-degree summers and monsoon downpours. A homeowner who knows what to ask for in writing can work with any turf installer, including us, and verify that the work is done right.
Turf Infill Options: Silica, Coated Sand, Zeolite and Envirofill
Infill is the material that fills the spaces between the synthetic grass fibres. It serves several jobs: it props the fibres upright so they look and feel natural, it protects the turf backing from ultraviolet light, it adds weight so the turf does not shift, and it plays a role in how water drains through the system. The most common infill is silica sand, a basic mineral ballast that is inexpensive and widely available. Silica sand works well for most residential yards, but it is not the only option.
Coated sand infills are silica grains treated with a polymer or mineral coating that rounds the edges, reduces dust, and often adds color to match the turf fibre. Coated sand is gentler on the turf backing and feels slightly softer underfoot than raw silica. Zeolite is a porous mineral that absorbs and neutralizes ammonia and other odors, making it a popular choice for pet turf and dog runs. Specialized coated infills with antimicrobial or cooling properties are sold under names such as Envirofill and other brand lines; these materials reduce bacterial growth and can lower the surface temperature of the turf in full sun. Crumb rubber, made from recycled tires, is used primarily in sports fields and playgrounds where impact protection is critical; it is not a standard residential infill because it can retain heat and requires different maintenance. The right infill depends on your use: a family yard may use silica or coated sand, a pet area benefits from zeolite or a pet-specific blend, and a sports court may use engineered infill systems.
How Much Infill Artificial Grass Needs, and Why
Infill is specified by weight in pounds per square foot, not by depth or volume. A typical residential turf installation calls for 2 to 4 pounds of infill per square foot, depending on the turf product, the fibre type, the pile height and the intended use. Pet turf often requires more infill, sometimes 3 to 5 pounds per square foot, because the extra weight helps the turf stay in place under paw traffic and provides more odor-absorbing capacity if zeolite is used. The infill amount is one of the most common places where budget-conscious installers cut corners: laying turf over too little infill saves time and material cost, but it leads to fibres that flatten and mat down, backing exposed to UV damage, and poor drainage performance.
Infill does several critical jobs. The weight keeps the turf from shifting and bunching at seams or under foot traffic. The material fills the spaces between fibres so they stand upright and do not clump together. The infill also protects the backing layer from direct sun exposure, which degrades the material over time. In a drainage sense, infill particles allow water to flow through the turf layer and down to the base. Too little infill means the fibres collapse, water does not drain evenly, and the backing ages faster. When you request a free estimate, ask the installer to provide the infill amount in writing as part of the specification. This single number tells you whether the job is built to last or cut to the lowest cost.
What to Put Under Artificial Grass for Drainage
The layers under the turf are as important as the turf itself. Installation begins with removal of the existing lawn, old turf or roots, which may require excavation to clear the area down to native soil. Once the ground is cleared, the installer grades the yard so water flows away from the house and any pool or patio, then lays a weed barrier (typically a non-woven geotextile fabric) to prevent weeds from growing up through the base. The weed barrier allows water to drain through while blocking plant roots and seeds. On top of the weed barrier goes the free-draining base material, usually decomposed granite (DG) or crushed base rock, compacted in layers with a plate compactor to create a firm, level surface.
On hard surfaces such as concrete patios, balconies or rooftops, the approach is different. Turf cannot be glued flat to concrete because water has nowhere to go and the backing will rot. Instead, a draining underlay or pad is installed between the concrete and the turf, with perimeter edge drainage so water can escape. For pet areas and playgrounds, an underlay or cushioning pad is often added over the base for comfort and impact absorption. The turf is then laid over this prepared surface, seamed, nailed and broomed to finish. Every layer has a purpose: the base provides drainage and support, the weed barrier blocks weeds, the underlay (where used) adds comfort and secondary drainage, and the turf itself is the wearing surface. Skipping or thinning any layer leads to failure.
Base Prep on Gilbert Caliche: Excavation, Base Rock and Compaction
Gilbert's soil is hard desert caliche and compacted earth that does not drain well on its own. A properly built artificial grass installation requires excavation and base preparation to create a free-draining layer beneath the turf. The depth of base material typically ranges from 3 to 4 inches when compacted firmly. The installer digs out the existing lawn or old turf, grades the ground so it slopes away from the house and pool, and lays down a base of decomposed granite or crushed rock. This material is spread in lifts (layers) and compacted with a plate compactor, which presses the particles together and creates a stable, level surface that allows water to flow through and drain downward rather than pooling on top.
An uncompacted base is a common failure point. Without proper compaction, the base settles unevenly over time, creating dips and low spots where water pools and sits. Pooled water cannot drain, odor builds up in pet areas, and the turf backing stays wet and degrades. In Gilbert's summer heat, a wet base can also accelerate decomposition of the backing material. If your yard has a genuine water problem (poor natural drainage, a low spot that holds water even after rain, or a history of flooding), the base drainage must be fixed before turf is installed, or the job should not proceed. A local independent turf installer names the base depth and material in writing and uses a compactor to ensure the base is firm. This is not a step to abbreviate.
Artificial Grass Drainage and Underlay: Perforated vs Fully Permeable
Artificial grass drainage is measured in gallons per hour per square foot, a figure that tells you how fast water passes through the turf backing. Turf backings come in two main types: perforated (with small holes punched through the material) and fully permeable (woven or needled so water flows through the entire backing). A fully permeable backing typically drains faster than perforated, but both are considered free-draining when properly specified. The drainage rate is important because Gilbert's monsoon storms can drop heavy rain quickly, and a yard with dogs or children needs fast drainage to avoid puddles and odor. However, a fast-draining turf still fails if the base underneath does not drain. Water must flow through the turf, through the infill, through any underlay, and into the base material, then downward into the soil or toward a drainage outlet.
Underlays and drainage pads are used in specific situations. On a concrete patio or balcony, a draining underlay sits between the concrete and the turf, creating an air gap so water does not sit against the slab. In pet areas and playgrounds, a cushioning pad may be added for comfort and to absorb impact, but it must still allow water to flow through. When you compare turf products or get a free estimate, ask for the drainage rate of the turf backing in writing. Combine that with a properly prepared and compacted base, and you have a system built to handle Gilbert's weather. Without both pieces, water will find a place to sit.
Seams, Nails, Edging and Power Brooming
The finishing details of a turf installation reveal whether the work was done carefully or rushed. Seams are the joints where two pieces of turf are joined together. A professional seam is created by overlapping the two pieces, cutting them so the edges meet cleanly with the grain aligned in the same direction, then bonding them with seam tape and a polyurethane adhesive designed for turf. The seam tape sits underneath the turf, holding the two pieces together while the adhesive cures. A visible seam, especially one where the edges do not meet cleanly or the grain direction changes, indicates poor workmanship. A seam that lifts or separates after installation suggests the adhesive was not applied correctly or the tape was not pressed firmly.
Edges and perimeter finishing also matter. The turf is secured to the ground with nails or staples spaced at regular intervals (typically 6 to 12 inches apart) around the perimeter and at seams. The outer edge is finished with bender board, a flexible edging material that holds the turf in place and creates a clean line between the turf and the surrounding patio, planting bed or walkway. On a patio with pavers or a pool surround, the turf is cut tight to the pavers so water can drain between the pieces and no standing edge collects debris or odor. Power brooming is the final step: a machine with stiff brushes stands the turf fibres upright and spreads the infill evenly across the surface. Proper power brooming ensures the turf looks full and natural and that infill is distributed so the turf performs as designed. A yard finished with care will show crisp seams, secure edges, and fibres that stand upright.
What a Written Turf Spec Should Include
Before any work begins, ask the turf installer to provide a written specification that details every material and method. This spec is your protection and your verification tool. A complete turf spec includes the turf product name and fibre type (polyethylene, nylon, or a blend), 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 material and depth when compacted, whether a weed barrier will be installed, the seam method (tape and adhesive), the edging material and method, cleanup and haul-off of old material, and the workmanship warranty period. The spec should also note any site-specific details such as the use of an underlay, a drainage pad, or special edge treatments for a pool or patio.
A written spec is not a sales document; it is a contract. It tells you exactly what you are paying for and allows you to compare apples to apples if you are getting multiple estimates. It also protects you after the job is done because you can refer back to it if a question arises about what was installed. When you ask for a free estimate, we measure your yard on site and provide a detailed spec before any price is quoted. Our pricing reflects the materials and methods named in the spec. A turf installer who will not provide a written spec, or who quotes a price per square foot without measuring or naming the product, is cutting corners you cannot see. Insist on the spec in writing, and you will know exactly what is going into your yard.