Artificial grass looks finished only from above, but what matters most lies underneath. The infill, base preparation, drainage system and seam work determine whether your turf will drain properly during a spring thunderstorm, stay cool underfoot in August, hold up to a dog's wear, or develop puddles and odor within a season. This guide walks you through each layer and the specifications that separate a durable installation from a shortcut job that fails in the Brazos Valley heat and humidity.
Whether you are installing turf for the first time, replacing a failed lawn, or evaluating a proposal from a turf installation company, you will find the technical details and the questions to ask. College Station's sandy loam over dense clay, our long hot summers and heavy spring rains, and the wear from pets and foot traffic all demand a foundation built right.
Turf Infill Options: Silica, Coated Sand, Zeolite and Envirofill
Infill is the granular material that sits on top of the turf backing and between the synthetic fibres. It serves several purposes at once: it props the fibres upright so they look full and feel natural underfoot, it protects the backing from ultraviolet light, it adds weight to keep the turf from shifting, and it helps the drainage system work by allowing water to flow through. The most common infill families are silica sand, coated sand, zeolite, and specialized antimicrobial or cooling products.
Silica sand is the basic ballast infill and the most economical choice. It is angular and compacts firmly, which anchors the turf well, but the sharp edges can feel harsh underfoot and do not cushion impact as much as rounded alternatives. Coated sand is silica sand that has been rounded and often coloured to match the turf fibre. It is gentler on bare feet, spreads more evenly, and is the standard for residential yards and play areas where comfort matters. Zeolite is a microporous mineral that absorbs and neutralizes ammonia and other odors, making it a popular choice for Pet Turf & Dog Run Installation. It does not replace proper drainage and base prep, but it does reduce odor when used alongside them. Antimicrobial and cooling coated infills such as Envirofill are engineered to reduce bacterial growth and lower surface temperature in direct sun. These products cost more but are worth considering in high-heat or high-traffic applications. Crumb rubber (recycled tire crumb) is a sports-field infill used on athletic fields and courts, not on residential yards, because it retains heat and requires specialized drainage and maintenance.
How Much Infill Artificial Grass Needs, and Why
Infill quantity is specified in pounds per square foot, and it is one of the easiest shortcuts for a cheap installer to take. Too little infill leaves the fibres standing thin and floppy, exposes the backing to ultraviolet damage, and allows the turf to shift under foot traffic or pet wear. The backing deteriorates faster, seams lift, and the turf flattens unevenly. Typical residential installations use between 3 and 5 pounds of infill per square foot, depending on the turf product, the pile height, the face weight, and the use (a putting green needs less; a dog run needs more). Sports and play areas may run higher.
The exact figure depends on the turf manufacturer's specification for that particular product and should be written into your estimate before work begins. When you ask a turf installation company for a proposal, request the infill amount in pounds per square foot in writing. If it is not specified, or if the company cannot name the figure, that is a red flag. A full specification also prevents disputes later about whether the job was done to plan. Ask to see the turf product data sheet, which lists the recommended infill range for that material.
What to Put Under Artificial Grass for Drainage
Proper drainage starts before the turf arrives. The first step is to remove the existing lawn, dead turf, roots and any organic material that will decompose and create voids beneath the new installation. This is especially important in College Station, where many yards sit on dense clay that holds water and can heave when wet. Once the old turf is cleared, the area is excavated to the depth required by the base specification, typically 3 to 4 inches. The ground is then graded to slope away from the house, the pool and any structures so that water runs off rather than pooling. A weed barrier fabric is often laid next to prevent perennial weeds from growing up through the turf, though this step depends on the site conditions and the installer's judgment.
Next comes the free-draining base layer, usually 3 to 4 inches of decomposed granite or crushed base rock, compacted firmly in lifts with a plate compactor. This base is the foundation that keeps the turf from settling, prevents puddles, and allows water to drain away. On top of the compacted base, an optional draining underlay or pad may be installed for added cushioning and drainage, especially in pet areas, play areas, or on patios where impact or moisture is a concern. Only after the base and any underlay are in place does the turf itself go down. On hard surfaces like concrete or balconies, the approach is different: a draining underlay or pad is laid directly on the slab, and edge drainage is installed to channel water away. Turf is never glued flat to a slab without an underlay, because water will collect beneath it and cause odor and deterioration.
Base Prep on College Station Soil: Excavation, Base Rock and Compaction
College Station sits on rolling post oak savannah with sandy loam over dense, slow-draining clay. This soil composition is the reason base preparation is not optional. The clay does not percolate water quickly, it heaves when saturated in winter, and it cracks open in summer drought. A turf installation that skips proper base prep will show its problems within a season: water pools under the turf after a spring thunderstorm, the turf settles unevenly and creates low spots that hold standing water, odor develops in pet areas, and seams begin to lift as the ground shifts beneath them.
The right approach is to excavate the area to the depth specified in the turf spec, typically 3 to 4 inches, and grade it so water sheds away from the house and pool. A plate compactor is then used to compress the base material in thin lifts, not all at once. Compaction done in layers (usually 1 to 2 inches at a time) creates a firm, stable foundation that resists settling. An uncompacted base will shift under foot traffic and pet wear, creating dips and puddles that trap water and smell. If a yard has a genuine water problem (chronic standing water, a high water table, or poor surface drainage), the drainage issue must be addressed first. If it cannot be fixed, the turf installation is declined. There is no point installing expensive turf on a yard that will not drain.
Artificial Grass Drainage and Underlay: Perforated vs Fully Permeable
Artificial grass backing comes in two main types: perforated and fully permeable. Perforated backing has small holes punched through it to allow water to drain, while fully permeable backing is engineered to let water flow through the material itself. The drainage rate is measured in gallons per hour per square foot. A faster drainage rate (often 20 to 30 gallons per hour per square foot or higher) is better for pet areas, play areas, and climates with heavy rainfall, because it prevents water from sitting on the turf surface. A slower rate is acceptable for drier climates or light-use areas. College Station's heavy spring thunderstorms and the August humidity mean that drainage performance is tested regularly. A turf with excellent drainage will still fail if the base underneath does not drain, so the two must work together.
Underlays and pads add another layer of drainage control. A draining underlay sits between the base and the turf, absorbing and dispersing water and adding some cushioning for foot comfort and impact protection. Pads are especially useful on hard surfaces like concrete patios or balconies, where water has nowhere to go if it is not managed. The underlay or pad must itself be permeable and installed with edge drainage so water does not collect at the perimeter. When you evaluate a turf proposal, ask for the backing type, the drainage rate in gallons per hour per square foot, and whether an underlay or pad is included. These figures should appear in your written specification.
Seams, Nails, Edging and Power Brooming
The finishing details separate a professional installation from a patch job. Seams are joined with seam tape and adhesive, and the grain of the turf (the direction the fibres lean) must be aligned so the seam is invisible. If the grain runs different directions on either side of the seam, light will reflect differently and the joint will be visible from certain angles. A visible seam is not just an eyesore; it is a sign that the installer did not take time to plan the layout. Nails or staples secure the turf around the perimeter, spaced at intervals (typically 6 to 12 inches) so the turf does not shift or lift. Spacing that is too wide allows movement and edge lifting; spacing that is too tight can damage the backing. The edges themselves are finished with bender board (a flexible edging material), a metal or plastic edge restraint, or a secured perimeter so the turf does not fray or curl up at the boundary. On patios and pool surrounds, the turf is cut tight to pavers and cool decks to eliminate gaps where water and debris collect.
After the turf is down, power brooming is done to stand the fibres upright and spread the infill evenly across the surface. A lifted seam, a visible seam line, or an edge that is curling up tells you the installation was rushed or the adhesive and nailing were not done properly. These are problems that will get worse with foot traffic and weather. A well-finished installation has clean, invisible seams, secure edges, and infill that is evenly distributed so the turf looks full and feels consistent underfoot.
What a Written Turf Spec Should Include
Before any work begins, you should have a written specification that details every layer and material going into your installation. This spec protects you and the installer by making clear what will be delivered. Here is the checklist: the turf product name and fibre type (polyethylene, nylon, or polypropylene), the face weight in ounces per square yard, the pile height in millimeters or inches, 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 (decomposed granite or crushed base rock), the base depth and compaction method, whether a weed barrier is used, how seams will be joined (tape and adhesive), how edges will be finished, what cleanup and haul-off are included, and the workmanship warranty period. Each of these details should be in writing before the crew arrives.
A written spec also prevents misunderstandings about pricing. Costs vary by product quality, infill type, base depth, site difficulty, and location within College Station and the surrounding areas. An on-site measurement and walkthrough are essential so the installer can see the soil, the drainage situation, the shade, the wear patterns and any obstacles. If you are ready to move forward, contact us for a free estimate and a detailed written specification for your yard.