Synthetic and artificial turf installation field guide

Artificial turf, and why the base makes the job

Artificial turf is a synthetic grass carpet, a plastic fiber tufted into a backing, laid over a prepared base and held flat by infill and edge anchoring. The carpet is the part the owner looks at and the part the salesman sells. It is also the part that almost never fails. Everything that goes wrong on a turf job comes from underneath it.

Say it plainly: the base makes the job. The wrinkles, the weeds, the puddle that sits for two days after a rain, the edge that lifts and trips somebody, all of it traces back to the dirt and the rock you put down before the turf ever came off the roll. A good carpet on a bad base is a bad job. A mid-grade carpet on a base that was excavated, drained, and compacted right will outlast the warranty and lie flat the whole time.

So the order of work is fixed and it is not the order people want to rush. Excavate and kill the weeds. Build and compact the aggregate base with a free-draining top. Set the drainage. Then, and only then, the turf, the seams, the anchoring, and the infill. This guide is landscape and commercial turf. For the higher-spec athletic field, with its drainage blanket, its shock pad, and its Gmax safety number, see the sister guide on sports field construction, and for the water math under any of it, the drainage, grading, and slope guide.

What base goes under artificial turf?

The base under landscape artificial turf is a compacted crushed-aggregate layer, commonly a Class II road base or a 3/4 in minus crushed rock, topped with a thin choker course of a finer material and compacted to a hard, flat plane. Depth runs about 3 to 4 in for pedestrian and lawn use, deeper where vehicles or heavy traffic come into play. The turf manufacturer's installation guide and the project geotech govern the exact section.

The reason it is two materials, not one, is particle size. The coarse base, 3/4 in down to fines, carries the load and drains, because the mix of sizes lets the small particles lock the big ones together when you run the plate compactor over it. On top of that goes a thin choker, decomposed granite or a crushed stone dust, screeded smooth, which fills the surface voids so the turf backing rests on a tight plane instead of bridging over gravel points. Lay turf straight on coarse rock and you feel every stone through the carpet, and the backing wears against the high points.

Compaction is what turns loose rock into a base. A plate compactor in lifts, with the base dampened slightly so the fines pack instead of dusting off, gets you the density that keeps the surface from settling into low spots later. Many specs call for compaction in the range of 90 to 95 percent, but confirm the target against the project documents and the turf maker, because an under-compacted base is the single most common cause of a turf job that goes wavy in its first year. Walk it before you screed the choker. Any spot that gives is a spot that will dish.

This is also where the difference from a sports field shows. A landscape base is a simple compacted aggregate. A competition field is an engineered profile with an open drainage stone, a laser-graded plane held to a tight tolerance, and often a shock pad for the Gmax number. Same family, different spec. The sister guide covers the field; this is the lawn and the plaza.

Excavation and removing the soil

Start by taking out the soil to the depth the base needs, plus the turf thickness, so the finished turf sits flush with the surrounding hardscape instead of proud of it or sunk below it. On a lawn replacement that is usually 3 to 4 in of dig for the base, plus the pile height of the carpet. Cut your grade off the adjacent walk or patio, not off the old lawn, because the old lawn is the thing you are removing.

Get the organics out. Topsoil, roots, the old sod, anything that holds water or breaks down, all of it comes out, because organic material under turf rots, settles, and feeds weeds. What you want to compact against is mineral subgrade, not loam. On a site with live weeds or an aggressive runner like Bermuda, a non-selective herbicide pass before you dig, or a clean dig that takes the root mass out, keeps the weeds from pushing back up through the seams later. The base and the barrier slow weeds. They do not beat a weed you buried alive.

Set the subgrade slope while the dirt is open. The whole point of the dig is to leave a compacted subgrade that already falls the way you want the water to go, so the base just carries that pitch up to the surface. Fix the fall now, with the excavator, while it is cheap. Trying to build pitch out of base rock alone, on a flat subgrade, wastes material and rarely holds.

How does artificial turf drain?

Artificial turf drains straight down through holes in the backing into the aggregate base, then out through the base to a daylight edge, a drain, or the soil below. The carpet itself is not the bottleneck. Most landscape turf has a perforated backing that passes water on the order of 20 to 30 in per hour, and fully permeable backings move multiples of that. The base and the soil under it decide whether that water actually leaves.

Build the base to drain and set a slight pitch, commonly on the order of 1 to 2 percent, so water that reaches the base moves to an outlet instead of sitting under the turf. On soil that percolates, the compacted aggregate over native ground drains fine on its own and the water just soaks away. The problem soil is clay, or any subgrade that will not perc. There, the water comes through the turf, hits a subgrade that refuses it, and backs up into the base, and you get a wet, sour, eventually weedy slab that smells after a rain.

For non-perc soil, you stop relying on the ground and you build a path out. A thicker open base, a separation fabric between clay and base so the clay does not pump up into the rock, and where the volume is real, a perforated drain pipe in the base running to a legal outlet. This is exactly the water math in the drainage and grading guide, applied under a carpet. The turf hides the drainage failure for one season. Then it tells on you, in the low spot, every time it rains.

The weed barrier

A weed barrier is a geotextile fabric laid over the finished base, under the turf, to slow weeds from coming up through the seams and perforations. It helps, within limits, and the limits are the part people miss. The fabric stops seeds that try to root from below. It does nothing about seeds that blow onto the turf surface and germinate in the infill and dust on top, which is where most artificial-turf weeds actually live.

Use a woven or non-woven landscape fabric rated to pass water, never plastic sheet, because a barrier that blocks drainage trades a weed problem for a puddle problem. On a clean dig over good soil, a fabric over the base is cheap insurance. Over aggressive runners like Bermuda or nutsedge, fabric alone loses, because those push through or find the seam. The real weed control is the dig and the herbicide before the base, the barrier second.

Pin the fabric flat and lap the edges so a runner cannot thread the gap. Keep it under the turf, not up the perimeter where it shows. Most ongoing weed maintenance on a finished job is a surface job: an occasional pre-emergent on the turf face and pulling the few that root in the infill. The fabric earns its keep against what comes from below.

How do you install artificial turf?

Once the base is compacted, screeded, and pitched, you lay the turf in four moves: roll it out, let it acclimate, run all the grain the same way, then cut it to fit. Each one has a way it goes wrong.

Roll the carpet out over the base and let it sit in the sun an hour or two before you commit to anything. The backing relaxes as it warms, the roll memory comes out, and turf that fought you straight off the truck will lie flat and trim clean once it has acclimated. Lay it cold and tight and you trap a wrinkle that the infill will not pull out later. On a cool day, give it longer.

Run the grain the same direction on every piece. Turf has a lean, the way the fibers tip, and it reads as a shade of green that shifts with the light. Two pieces with the grain opposed look like two different colors laid side by side, even when they came off the same roll, and the eye catches it instantly at a seam. Decide the grain direction for the whole job before you cut the first piece, usually leaning toward the main viewpoint so the lawn reads full and dark from the house or the entry.

Cut to fit from the back. Flip the edge or part the fibers and cut the backing with a hook blade between the stitch rows, so you sever backing, not fiber, and the cut line disappears into the pile. Trim tight to hardscape, leaving a hair of gap to the edge so the turf is not bunched against the concrete. Dry-fit the whole layout and check every seam and edge before any glue or nail goes down, because everything after this point is permanent.

Seaming the rolls invisibly

A seam is two turf edges butted together over a strip of seam tape and bonded with turf adhesive, so the join disappears into the pile. Done right you cannot find it on your knees. Done wrong it is the first thing anyone sees, and it is the most common visible flaw on a finished landscape job.

The method that holds is tape and glue. Lay a wide seam tape, commonly about 12 in, glossy or marked side down and fabric side up, centered under the join so each turf edge lands about half on the tape. Run the adhesive on the tape in a continuous serpentine bead, an S pattern, so glue spreads under the whole seam width when you set the turf down without squeezing up through the fibers. Then bring the two edges together, butted, not overlapped and not gapped, and press the seam into the glue with a roller, a tamper, or your knees and feet until it makes full contact.

Two things make or break it. The edges have to match, cut clean between stitch rows so no row of stitching shows as a bald line down the seam, and the grain has to run the same way across the join, which is why grain direction got decided before the first cut. Keep the fibers up and out of the glue as you set it, picking stray blades out of the seam with a screwdriver before the adhesive grabs. Glue on the fiber face is a permanent shiny scar. Nails through a seam are the cheap method and they work, but tape and glue is the seam that stays invisible and stays down.

Anchoring the perimeter and the edges

The turf is held at its edges, and the edge is where a turf job lifts, curls, and fails. Anchor the full perimeter and every seam, and give the perimeter something solid to nail into, or the carpet will creep and the corners will peel back the first time a kid runs across it.

Around the perimeter, drive galvanized turf nails or landscape staples through the backing into the compacted base, commonly on the order of every 4 to 6 in along edges and seams and wider in the field. Use galvanized so they do not rust-stain the turf, drive them flush so no head sits proud to catch a foot, and part the fibers so the nail goes through backing, not through a clump of blades pinned down into a visible dimple. Snug, not crushed. A nail hammered too hard dishes the turf around it.

Where the turf does not die into hardscape, it needs an edge to hold it. A buried bender board, a steel or composite landscape edge, or a concrete mow curb gives the perimeter nails something to bite and keeps the base from spilling and the edge from rolling. A free edge with nothing behind it is a curl waiting to happen. On a clean transition to a walk or patio, the turf nails into the base tight to the hardscape and the concrete is the edge.

What is infill in artificial turf?

Infill is the granular material, most often silica sand, brushed down into the turf between the fibers after it is laid. It is not optional dressing. It is what makes the turf work. The infill weights the carpet down so it stays put, holds the fibers upright so the lawn looks full instead of matted, protects the backing, and on most landscape jobs it is the thing that keeps the surface from baking as hot as bare plastic would.

Most landscape turf takes roughly 1 to 3 lb of infill per square foot, depending on pile height and the manufacturer's spec, which is the number that actually governs. Plain silica sand is the workhorse: cheap, available, and it does the job of standing the fibers up and adding ballast. Coated silica sand costs more and earns it where heat or odor matter, because the coating reflects sun to run cooler and many coatings carry an antimicrobial that helps in pet areas. Crumb rubber belongs on athletic fields for cushioning and is the wrong call on a landscape lawn, where it holds heat and you do not need the shock attenuation. Organic infills exist for pet and play areas where people want to skip rubber.

Spread it in passes, not one dump. Run a drop spreader across the turf, brush it in, add more, brush again, and work it down to the base of the fibers so the blades stand and the sand disappears below the pile. The amount is the spec, and short-filling is a real and common cheat: the lawn looks fine on day one and goes flat and matted within months because nothing is holding the fibers up. The infill you can see sitting on top is a sign it was rushed in, not brushed in.

Brushing and grooming the fibers up

After the infill is in, you power-broom the turf to stand the fibers up and settle the sand to the bottom of the pile. This is the step that takes a flat, sandy-looking carpet and turns it into a lawn. A power broom, or a stiff brush on a small job, lifts the blades against the grain and works the infill down where it belongs.

Brush against the grain, not with it. Going with the lean lays the fibers flatter; going against it stands them up and that is the finished look you want. Make more than one pass, in more than one direction, until the infill is gone from the surface and the pile is uniform and upright with no flat tracks from where you walked the spreader.

Grooming is also the recurring maintenance the lawn needs later, not just a finishing move. The same brushing that finishes the install is what the owner does periodically to keep high-traffic paths from matting flat. Tell them that before you leave, because a matted track down the middle of a lawn is almost always a brushing problem, not a turf defect.

Heat and the dark plastic surface

Synthetic turf gets hot in direct sun, hotter than the air and far hotter than live grass, because it is dark plastic with no transpiration to cool itself. Surface temperatures commonly run well over 140°F in strong sun and can reach 160 to 200°F on a hot, bright day, enough to be uncomfortable on bare feet and a real consideration for pets and play areas. Set the expectation with the owner up front rather than after the first heat wave.

Two things move the number. Infill choice matters: light, reflective coated sand runs cooler than dark crumb rubber, which soaks up and holds heat, which is one more reason rubber is the wrong infill for a residential lawn. And water cools it fast. A quick hose-down drops the surface temperature sharply for a while, which is the practical fix on a hot afternoon before the dog or the kids go out.

On design, the lever you have is the product and the placement. Heat-mitigating turf lines exist and run cooler than standard polyethylene, and shade, whether a tree, a structure, or an awning, does more than any infill. There is no synthetic turf that stays cool in full desert sun. The honest answer to the owner is that it gets hot, here is what makes it cooler, and water is the on-demand fix.

Pet turf

Pet turf is built around drainage and odor, because the failure mode is not wear, it is the smell that builds when urine sits in the base. The carpet is similar to a landscape lawn, sometimes a shorter, denser pile that hoses clean easier, but the base and the infill are where a pet job is made or lost.

Build the base to drain hard and fast, because urine has to flow straight through and out, not pool in the rock. Many pet installs use an open, free-draining aggregate and skip anything that holds moisture. The infill is usually a coated sand with an antimicrobial, or a purpose-made pet infill, chosen to resist the bacteria that turn waste into ammonia stink. A deodorizing infill helps, but it is not a substitute for a base that actually drains and an owner who actually rinses.

The maintenance is the real answer to odor. Solids get picked up, and the area gets rinsed regularly, more in summer, because the smell is bacteria in standing residue and rinsing is what carries it out through the base. A pet turf that drains and gets rinsed stays fine for years. One that ponds, or never gets hosed, will smell no matter what infill went in. Tell the owner that plainly. The system only works if they keep up their half of it.

Putting greens

A putting green is a specialty turf and a tighter base, because the surface has to roll true. The carpet is a short, dense, sand-filled nylon or polyethylene built for ball roll, and the base under it is held to a flatter, harder tolerance than a lawn, because every dip and soft spot shows up as a break the golfer did not putt.

The base work is the same family, finer execution: a well-compacted aggregate with a hard, smooth decomposed-granite or stone-dust top, screeded and rolled dead flat, because a putting surface punishes a base that settles. Contours and cup locations get shaped into the base on purpose, and the fringe turf around the green is a separate, taller product seamed to the putting surface. Infill is brushed in to set the green's speed, with more infill making a slower, truer roll.

If the customer wants a backyard green that actually putts, the cost is in the base flatness and the seaming, not the carpet. A green built on a lawn-grade base rolls like a lawn. This is closer to the precision of a sports surface than a landscape lawn, which is why it sits between the two and why the build deserves the extra base care.

How do you maintain artificial turf?

Artificial turf is low-maintenance, not no-maintenance, and the gap between those two is where owners get disappointed. It needs three things on a schedule: rinse it, brush it, and top off the infill. None of it is hard, and skipping it is what makes a good install look tired in two years.

Rinse the surface to clear dust, pollen, and pet residue, more often in dry and dusty climates and pet areas, because the dust that settles into the infill is where surface weeds root and where pet odor lives. Brush the high-traffic paths to stand the fibers back up, since the lanes people actually walk are the lanes that mat flat, and brushing against the grain is the fix. Keep weeds down with the occasional pull and a pre-emergent on the surface, because the weeds that show up on a finished job mostly blow in from above, not up from below.

Top off the infill over time. Infill works down and migrates, and high-traffic and drained areas lose it first, so a periodic refresh keeps the fibers standing and the surface from going flat and shiny. This is the maintenance the owner inherits the day you leave, so hand it over in writing: rinse, brush, weed, top off the infill, and here is roughly how often for this site. A turf job fails slowly when nobody told the owner it needed anything.

Commercial and campus turf

Commercial turf, the kind that goes in front of an office, around a corporate campus, or on a data center site, is the same craft at a different scale and a different spec. The drivers change: durability under public foot traffic, a base engineered for the loads, drainage tied into the site's stormwater system, and a look that has to read clean from the parking lot and stay that way with minimal grounds crew.

The base and drainage get more engineering, not less. On a large site the turf areas tie into the civil drainage and the project stormwater design rather than just daylighting at an edge, and the permeable surface can count toward the site's runoff and water-use goals, which is part of why campuses choose it. That makes the local stormwater rules and the civil drawings the governing documents for the drainage, alongside the turf manufacturer for the base and infill.

Specification and documentation matter more on a commercial job because more people inherit it. The product, the base section, the infill, the seam method, and the warranty all get written down and verified against the spec, because the facilities manager who takes it over was not there when it went in. Where a backyard runs on trust, a campus runs on the submittal and the closeout. Build it to the spec and document what you built.

The warranty and what it does not cover

Most landscape turf carries a manufacturer warranty in the range of 8 to 15 years against fiber breakdown and UV fade under normal use. Read it before you sell it, because the warranty covers the carpet, and almost nothing that goes wrong on a turf job is the carpet.

What the warranty does not cover is the install. A base that settles, a seam that opens, an edge that lifts, infill that was never put down to spec, drainage that ponds, all of that is workmanship, and it is on the installer, not the mill. That is the whole argument for doing the base and the seams right: the part you are responsible for is the part that actually fails, and the manufacturer's paper does not bail you out of it.

Keep the documentation that ties the warranty to the install. The product and lot, the base section, the infill type and rate, the seam method, and the install date are what a warranty claim and the next contractor will ask for. The mill warranty protects the customer against a bad batch of fiber. Your install is what protects them against everything else, and the record is what proves which one failed.

What to document

Everything that decides whether a synthetic lawn lasts gets buried before the job ends, which leaves the install record as the only honest account of what is under the green. The record answers the questions that come up later: what was the base, did it drain, how were the seams made, and how much infill went in. Those are exactly the things you cannot see once the lawn is green.

Capture the area and the turf product and lot, the base section and its compaction, the drainage approach and any pipe or fabric, the seam method, the infill type and the rate per square foot, the perimeter anchoring and edge, and the maintenance handed to the owner. The infill rate especially, because a short-filled lawn looks fine the day it is finished and the only proof of what went in is the record you kept.

Common mistakes

• Under-compacting the base, so the surface settles and goes wavy in the first year.
• No drainage plan on clay or non-perc soil, so water backs up into the base and the low spot ponds.
• Running the grain different directions on adjacent pieces, so the seam reads as two shades of green.
• Overlapping or gapping seam edges, or letting glue onto the fiber face, so the seam shows.
• Short-filling the infill below the manufacturer's rate, so the lawn mats flat and shiny within months.
• No perimeter anchor or edge restraint, so the edges lift, curl, and trip people.
• Burying live weeds or organics instead of removing them, so weeds push up through the seams.
• Laying the turf cold and tight without acclimating it, so trapped roll memory becomes a permanent wrinkle.

Field checklist

Standards and references

Artificial turf installation is governed less by a single code and more by a stack of documents, and knowing which one controls which decision keeps you out of trouble. The turf manufacturer's installation instructions are the top authority for the base section, the infill type and rate, and the approved seam method, because that is what the product warranty is written against. Deviate from them and you have voided the part of the warranty that protects the customer.

The Synthetic Turf Council (STC) publishes industry guidelines and best-practice documents for synthetic turf installation and maintenance that are worth knowing as the trade reference, though they are recommendations, not enforceable code. On a commercial or campus job the project landscape specification governs, and it commonly invokes the manufacturer and STC practice by reference. For drainage, the local stormwater and grading rules and the civil drawings control the runoff and any tie-in to the site system, which is the same authority the drainage and grading guide leans on.

Where the trade and a spec disagree, the spec wins, and where a spec and the manufacturer's instructions disagree, raise it before you build, because installing against the manufacturer is how you end up owning a warranty claim that should have been theirs. Confirm the governing documents for the specific job rather than assuming a national standard sets the number. This is craft work, and the base, the infill, and the seam are set by the product and the project, not by a code book.

Units, terms, and conversions

Synthetic turf and artificial grass are the same thing, and the trade and the marketing use the names interchangeably. A few terms and units repeat across product sheets, specs, and base material tickets, and they are worth pinning down so the drawing, the supplier, and the field all mean the same thing.

Pile height is the fiber length in inches, face weight is the fiber weight per square yard in ounces, and infill rate is given in pounds per square foot. Base material comes by the ton or the cubic yard, so a base takeoff converts depth and area into volume and then into tons at the quarry. Drainage rates show up as inches per hour through the backing. Class II road base and 3/4 in minus are the common base aggregates; decomposed granite, often written DG, and crushed stone dust are the common choker tops.

Pile height

The length of the turf fiber in inches, measured from the backing to the blade tip

Face weight

The weight of the fiber alone per square yard in ounces, a proxy for density and durability

Infill

Granular sand or coated sand brushed into the fibers to add ballast, stand the blades up, and protect the backing

Choker / top course

The thin layer of fine material (DG or stone dust) screeded over the base so the turf rests on a tight plane

Class II road base

A graded crushed-aggregate base, fines to about 3/4 in, that compacts into a stable, draining foundation

Perforated backing

Turf backing with drainage holes; fully permeable backing drains across the whole surface for higher flow

Grain

The direction the fibers lean, which reads as a shade of green and must run the same way across every seam

Related tools

Calculators and readiness checks for this work

Compare your options

FAQ

People also ask

• How do you build a sports field?
• How much should the ground slope away from a house?
• How do you install sod?
• How deep should a fence post be?
• How many strings of holiday lights can you connect end to end?