Artificial Grass Glossary: Definitions and Explanations

Picture a landscaper opening the morning post. A quotation sits on page one, a specification sheet is clipped behind it, and six numbers line up side by side. Pile height, face weight, denier, dtex, gauge, tuft bind. Nowhere does either page say which number decides how the lawn feels underfoot or how it looks after five years.

That gap is why this artificial grass glossary is grouped rather than alphabetical. Every A to Z list we have read sorts terms by their first letter, and that is the one thing a buyer never sorts by. We group six clusters by the decision each answers, in the order the decisions are actually taken. Read it as an artificial grass glossary written for a buying conversation rather than for a vocabulary test.

Why This Glossary Is Grouped Instead of Alphabetical

A definition tells you what a number measures, but not whether that number is good, bad or irrelevant to your project.

A buyer wants to know whether a lawn will stay upright under a swing set. An A to Z list sends that buyer to three separate places: pile height, density, and tuft bind. The three numbers only mean something together, and the alphabet separates them by definition.

The layers underneath come third, because they are where most disappointments start. Installation construction follows, then ageing, then the quotation language itself. Where a topic deserves more room than a definition, we name the page that carries it.

Group 1 Fibres and Polymers in the Grass

These terms share one question: what is this surface made of, and what happens to it after a few summers in the sun? Materials set the ceiling on feel and spring, and stiffer yarns need different handling during an artificial turf installation. The polymer is the raw chemistry, the fibre is that chemistry drawn into a strand, and colour, lustre and memory are properties of the finished strand.

The yarn is the twisted strand tufted into the surface, and the fibre is the individual filament inside it. Monofilament fibre is extruded as one solid strand shaped to resemble a blade, and it does not split. Slit-film fibre is cut from a film and opens apart in use, so its fraying is behaviour rather than a defect.

Polyethylene is the soft, springy polymer behind most face yarns, and this family decides how the lawn feels underfoot. Polypropylene is stiffer and coarser, and it usually appears as the curly thatch. Nylon is the toughest and the most abrasive of the three, and it carries the highest cost. Polymer is the umbrella term for all of them, the shared chemical starting point of yarns, infill and backing.

Thatch is the layer of brown curly fibre sitting under the blades, lifting the pile while making the surface read as natural. Extrusion is the process of pushing molten plastic through a shaped die to form a filament, step two of our own production line.

UV stabilised describes an additive worked into the yarn so sunlight degrades it more slowly; treat it as a process description, not a certificate. Deeper greens suit regions that stay green all year, while lighter greens pair with brown thatch in drier settings. Lustre is the sheen on the fibre, and it decides whether the lawn reads as plastic.

Memory is the fibre returning toward its original shape after being pressed down. It is the most misread term in this group: memory here is a material property, not a capacity or a size. Blade cross-sections and what each shape does for stiffness are covered in our guide to artificial grass blade shapes.

Before comparing any two samples, ask three material questions: which polymer dominates the face yarn, has it been UV treated, and is the colour a single tone or a blend.

Group 2 Spec Sheet Numbers Decoded

Spec sheet numbers are the artificial grass terms buyers ask about most, and they must be read together. Pile height describes the look, density describes how much fibre sits in each square metre, and denier or dtex describes strand thickness. The price consequences of these numbers belong to our guide to artificial grass cost per square metre factors.

Pile height is the length of the blades measured from the backing to the tip, normally quoted in millimetres. Shorter pile reads as tidy and clipped, longer pile reads as lush and deep. The judgement that matters is that height is not quality: the taller the pile, the more density it needs to stay upright.

Face weight, also called pile weight, is the mass of yarn per unit area, excluding the backing. Total weight includes the backing, which is why the two figures on one sheet never match. Our breakdown of what face weight really tells you takes that arithmetic further.

Denier is a unit of linear mass based on the weight of a fixed length of yarn, and larger numbers mean thicker individual fibres. Dtex is the same idea on a finer scale, and residential yarns are commonly quoted in the five figures.

Gauge is the spacing between the rows of tufts across the width, and stitch rate is the number of stitches over a set length. Density is the derived figure, not a headword you will find on its own line. Gauge, stitch rate and fibre thickness together produce it, which is why two rolls with identical gauge can still differ in density.

Two unit systems describe the same quantity: ounces per square yard in the United States, grams per square metre in the United Kingdom and Australia. The conversion table sits in the face-weight guide rather than here.

The bands below describe appearance and traffic, not quality ranking.

The middle band covers most residential lawns because it looks natural without tipping forward, while a long pile needs the density to hold it up.

Work the sequence in one direction. Fix the pile height that suits the space, then compare face weight and density for wear, and only then use denier or dtex to check strand thickness.

Group 3 Backing and Drainage Layers

This group answers one question an inspection of the surface cannot: where does the water go, and will the surface stay flat? Every term here describes the underside of an artificial turf installation, the side a buyer never sees at hand-over. Failures here appear late, which is exactly why this vocabulary matters at quotation stage. Buckling, puddling and pulled tufts all trace back to this layer, not to the blades.

The primary backing is the woven or non-woven cloth the yarn is tufted into. The secondary backing is the coating applied behind it that locks those tufts in place. Latex and polyurethane are the two common chemistries, and polyurethane is generally the more durable of the pair.

Perforations are the regularly spaced holes punched through the backing, and permeability is the rate at which liquid passes through the finished sheet. Perforating is step seven of the eight in our process chain, so we treat hole condition as a manufacturing question rather than a site question.

Drainage rate is the volume a surface and its base can clear in a given time. It is the direct answer to whether the lawn sits under water in a cloudburst, and it depends on the base as much as the holes.

Dimensional stability is the backing’s ability to keep its size, so the surface does not stretch, shrink or buckle over the seasons. Tufting is the act of stitching yarn through the backing, and tuft bind is the force needed to pull one tuft back out. That single figure answers the question every parent asks about a child and a handful of grass.

How each layer behaves once installed is the subject of our guide to what those turf layers do.

Three questions carry the group: is the secondary backing polyurethane or latex, what is the tuft bind, and can the supplier state a drainage rate.

Group 4 Base Edging and Infill

These terms cover what sits under the grass and how the edges and joins are held. They decide whether an artificial turf installation stays flat, whether it cups at the borders, and whether seams stay closed after a wet winter. They are also the first items a low quotation quietly removes.

Read them as a single build-up rather than a parts list. The base carries the load, the membrane stops weeds, the edging confines the stone, and the infill props the fibres up.

The sub-base, also called the base or the laying course, is the crushed stone layer the turf rests on. Aggregate is the collective name for the rock inside it, such as limestone, grano dust or sharp sand. Excavation is digging out the existing surface to make room for that build-up.

A whacker plate, or plate compactor, is the vibrating machine that densifies the stone, and compaction is the process of applying that energy. The judgement question is not whether compaction happened but how many passes were taken and to what finished depth.

Weed membrane is the permeable fabric laid between the stone and the turf to suppress growth. Edging is the border restraint that holds the base in place. Rubber edging gives a sloped transition at a level change, timber edging gives a straight line, and haunching fixes a hard edge with concrete.

A seam, or joint, is where two rolls meet. Seaming tape is the backing strip laid beneath the join, and adhesive is the bonding agent that holds it. A seam is the weakest point on any lawn, so ask where the seams will fall and what adhesive will be used.

U-pins and galvanised nails hold the perimeter and any loose areas down. Infill is the material broadcast between the fibres, and it holds them upright, adds weight and softens the surface. Silica sand and crumb rubber are the common types, while envirofill is an acrylic-coated sand and zeolite fills serve odour control.

A shock pad, or foam underlay, is a resilient layer under the turf that adds cushioning. Layer by layer sequences are covered in our walkthrough of what to expect during installation.

Four items belong on the verification list before the base goes down: stone depth, compaction passes, the adhesive that closes the seams, and whether removing existing material is priced in. Definitions only take a buyer so far, because feel and spring cannot be photographed. Order a sample and compare what your hand finds with what the sheet claims.

Group 5 Words That Describe Ageing

These words describe how a lawn changes after an artificial turf installation has settled, rather than what it is on delivery day. Ageing is judged against traffic, drainage and fibre type at once, and no single number predicts it.

Durability is the ability of a surface to resist wear, foot traffic and weather without losing its appearance or its function. It is a summary word, not a measurement, and it is always relative to how the lawn gets used.

Matting is what happens when fibre is pressed flat or tangled by repeated traffic, and it is the most common reason a lawn starts to look tired. Shedding describes the few loose fibres that appear shortly after installation, usually a by-product of cutting and site clean-up rather than a fault.

Brooming is the practice of brushing the pile upright and redistributing infill, and a powerbroom is the powered version of the same action. Cleaning and contamination cover the same principle from the other direction. Soil, leaf litter and dust inside the pile reduce performance and slow drainage, so keeping them out is maintenance.

In hot regions a related pair of words comes up: conditioning, meaning treatment that reduces static cling, and heat retention, where a lighter coloured fill keeps the surface cooler underfoot. Both are comfort terms rather than durability terms.

Wear testing and selection between grades sit in our guide to how artificial grass wears over time, and warranty wording belongs with the buying terms in the next group.

Rather than asking for one figure on longevity, ask three performance questions. How well does the pile resist matting, how does the yarn hold its colour in strong sun, and how stable is the backing over time. Fibres that go flat before they fray point at traffic and recovery, while frayed fibre with infill still in place points at the yarn. Buyers who make that distinction early ask far better questions of their supplier.

Group 6 Quotes Units and Warranty Language

These are the artificial grass terms that appear on the paperwork rather than on the sample, and they turn the first five groups into money, area and promises. A buyer who understands the technical words can still be caught out by the commercial ones.

A quote for an artificial turf installation is an estimate covering the surface as well as the work. Supply only means material delivered with no labour, and supply and fit means both material and installation are included. The same roll carries three different prices depending on which you are buying.

Area is quoted in two systems: square metres in metric markets, square feet in the United States. Life-cycle costs describes the sum of buying, maintaining and eventually replacing the surface rather than the purchase price alone.

A surveyor is the person who measures the area, the boundaries and the levels before a price is fixed. An artificial turf installation quoted without a site visit is an estimate with more room to move. Warranty and guarantee are the written promises a supplier or installer makes about product or workmanship. In practice they differ in what they cover far more than in how long they run. For a breakdown of installed cost, our guide to how installation cost breaks down covers the components a quote should itemise.

Three questions close this group, all about coverage rather than headline. Which tasks does the quote include, is the area quoted in square metres or square feet, and what does the warranty actually cover.

Turning Definitions Into Questions for Suppliers

Definitions are worth little until they change what you say on a call. Each entry in this artificial grass glossary is written so you can act on it during a call or a site visit. The table below collapses the six groups of this artificial grass glossary into the questions that carry the most information. Use it as a reading order for a spec sheet and a quotation for an artificial turf installation, not as a comparison checklist.

Ask the question before you see the price, because the shape of the answer tells you how well the supplier knows the product. Then write the answers down beside each figure, so two quotes compare on coverage rather than the bottom line alone.

Frequently Asked Questions