Reinforcement mesh sizes: sheets, weights, prices and the fibre alternative

The most common reinforcement mesh sizes follow the national standard sheet: 4.8 × 2.4 m in the UK (A142, A193, A252 and A393 to BS 4483), 6.0 × 2.4 m in Australia (SL62 to SL102) and 3.0 × 2.0 m in the Netherlands and Belgium. Wires of 4 to 12 mm at 100 to 200 mm centres give roughly 1 to 12 kg of steel per m².

Whatever the size, a mesh only works when it sits at the right height in the slab. For many ground-bearing floors, fibre reinforcement mixed into the concrete now replaces the mesh altogether; both routes are covered below.

What is reinforcement mesh?

Reinforcement mesh for concrete is a grid of longitudinal and transverse reinforcing steel wires, machine-welded together at every intersection. The result is a dimensionally stable mesh that absorbs tensile stress in the concrete as soon as the concrete cracks, exactly where concrete itself is weak. It is supplied as flat reinforcement sheets (sheet reinforcement) rather than loose bars, so the steel does not have to be fixed bar by bar on site.

The product goes by a different name in each market. In the UK it is called reinforcing mesh or fabric reinforcement, in Australia and New Zealand reo mesh, and in the US welded wire reinforcement or simply wire mesh; rebar mesh is the generic term used across markets. In the Netherlands and Belgium the same product is known as bouwstaalmatten, wapeningsnetten or betongaas. Whichever name you use, reinforcing mesh sizes are always described in the same three values: sheet size, wire diameter and pitch.

Mesh is ordered by its reference. In the UK, the letter indicates the mesh type and the number gives the steel cross-section in mm² per metre width of the main wires: A142 has 142 mm² of steel per metre in each direction. On site and in merchant listings this fabric reference is often shortened to 'ref' (mesh ref A142), so a list of ref mesh sizes is simply the list of standard references below. The Dutch PS designation works the same way: the number stands for the steel cross-section in mm² per linear metre, so a PS 188 is a mesh with 6 mm wires at a 150 × 150 mm opening and a PS 335 has 8 mm wires at the same opening.

In the Netherlands, the wires are usually supplied in steel grade B500A to NEN-EN 10080; in Belgium, mesh is often referred to by the steel grade BE 500 S. This Belgian usage has nothing to do with UK B mesh, described below.

Reinforcement mesh is one of the two main routes for reinforcing a concrete floor. The other route is fibre reinforcement that is distributed through the concrete during mixing; more on that below, because for many floors it is now the faster alternative.

Reinforcement mesh sheet sizes: what size is a sheet of mesh?

The standard mesh sheet size is 4.8 × 2.4 m in the UK, 6.0 × 2.4 m in Australia and 3.0 × 2.0 m in the Netherlands and Belgium.

Reinforcing mesh dimensions always consist of the sheet size, the pitch (the centre-to-centre spacing of the wires) and the wire diameter. The usual formats by market:

• UK and Ireland: 4.8 × 2.4 m (11.52 m²) is the standard sheet for all BS 4483 meshes. Merchants also stock smaller 3.6 × 2.0 m sheets (7.2 m²), and flying-end and bespoke sheets are made to order.

• Australia: 6.0 × 2.4 m (14.4 m²) for SL and RL mesh, plus compact 4.0 × 2.0 m sheets for small jobs.

• Netherlands and Belgium: 3.0 × 2.0 m (6 m²) is the size that builders' merchants and DIY stores keep in stock. Smaller trade sizes of 2.0 × 1.0 m and 2.5 × 2.0 m are handy for renovation or restricted access, and project sheets up to about 6.0 × 2.4 m, including sheets with starter bars for connecting reinforcement, are supplied to order.

• United States: welded wire reinforcement comes in sheets and rolls and is designated by spacing and wire size rather than by sheet. Common wire mesh sizes for concrete run from 6x6 W1.4/W1.4 (wires of about 3.4 mm at 152 × 152 mm) to 4x4 W5.4/W5.4 (102 × 102 mm), roughly 1.0 to 5.8 kg/m².

• Mesh openings: 50 × 50, 100 × 100, 150 × 150 and 200 × 200 mm are the common grids. In the Netherlands and Belgium 150 × 150 mm is the standard for floors; UK A mesh uses 200 × 200 mm.

• Wire diameters: 4, 5, 6, 7, 8, 10 and 12 mm; galvanised versions are mainly available in the thinner diameters for garden and interior applications.

When ordering, pay attention to the combination of wire diameter and opening: a 6 mm mesh with a 100 × 100 mm opening contains considerably more steel per metre than the same wire at 150 × 150 mm, and so gives a larger steel area per metre. Compare prices and weights per m² rather than per sheet as well, because a UK sheet (11.52 m²) is almost twice the area of a Dutch one (6 m²).

UK reinforcement mesh sizes to BS 4483: A, B, C and D mesh

In the UK, mesh reinforcement sizes are standardised in BS 4483, and the standard types are supplied on 4.8 × 2.4 m sheets. When a UK supplier lists ref mesh or rebar mesh sizes, this is the series they mean. There are four families:

• A mesh (square mesh): the same wire in both directions at 200 × 200 mm, from A98 to A393. This is the everyday mesh for ground-bearing slabs.

• B mesh (structural mesh): main wires at 100 mm and cross wires at 200 mm, from B196 to B1131, for designs that need more steel in one direction.

• C mesh (long mesh): main wires at 100 mm with light cross wires at 400 mm, from C283 to C785 (about 2.8 to 6.7 kg/m²), for slabs that span in one direction.

• D mesh (wrapping mesh): a light 2.5 mm mesh at 100 × 100 mm, D49, weighing about 0.77 kg/m².

How to read the table: A193 has 7 mm wires at 200 mm centres in both directions, which gives 193 mm² of steel per metre each way and a weight of 3.02 kg/m². The lightest B mesh, B196, combines 5 mm main wires with 7 mm cross wires and weighs 3.05 kg/m², or 35.14 kg per sheet.

Where two standard sheets are lapped, four layers of wire end up on top of each other. Flying-end sheets have main wires that extend beyond the last cross wire, so the lap stays flatter and the concrete cover is easier to maintain.

Reinforcing mesh sizes in Australia: SL and RL mesh

Reinforcing mesh in Australia comes on 6.0 × 2.4 m sheets in two families: SL for square mesh and RL for rectangular mesh. The reinforcing mesh size is read from the code. Roughly, the first digit or digits give the approximate wire size and the last digit the spacing in hundreds of millimetres, so SL82 has 7.6 mm wires at 200 mm and SL81 the same wire at 100 mm. Indicative values from supplier data:

• SL62: 6.00 mm at 200 mm, about 33 kg per sheet.

• SL72: 6.75 mm at 200 mm, about 40 kg per sheet.

• SL82: 7.60 mm at 200 mm, about 52 kg per sheet.

• SL92: 8.55 mm at 200 mm, about 65 kg per sheet.

• SL102: 9.50 mm at 200 mm, about 80 kg per sheet.

• SL81: 7.60 mm at 100 mm both ways, about 105 kg per sheet.

• RL718 to RL1218: main wires of 6.75 to 11.90 mm at 100 mm with 7.60 mm cross wires at 200 mm, about 68 to 157 kg per sheet.

For small jobs, compact 4.0 × 2.0 m sheets are easier to handle: an SL62 sheet in that size weighs about 18 kg, an SL82 about 30 kg.

Reinforcement mesh weight per m² and per sheet

The weight of a reinforcement mesh follows directly from the wire diameter and the pitch. As a rule of thumb, the weight per m² equals the mass per metre of the wire multiplied by the number of wires per metre, taken twice for the two directions of a square mesh. The mass per metre of steel wire is d² × 0.00617 kg/m (d in mm): about 0.154 kg/m at 5 mm, 0.222 kg/m at 6 mm, 0.302 kg/m at 7 mm, 0.395 kg/m at 8 mm, 0.617 kg/m at 10 mm and 0.888 kg/m at 12 mm.

Worked example for the A193 mesh weight per m²: 7 mm wires at 200 mm centres means five wires per metre. 5 × 0.302 kg/m × 2 directions = 3.02 kg/m². Multiplied by the 11.52 m² of a 4.8 × 2.4 m sheet, that comes to about 34.8 kg per sheet, the value in the BS 4483 table above.

Mesh weights matter for transport and manual handling, but also for crane planning: a bundle of fifty 8 mm sheets of 3.0 × 2.0 m already weighs about 1,600 kg, and a single UK A393 sheet weighs about 71 kg.

For the Dutch and Belgian 3.0 × 2.0 m sheets, the table below gives indicative weights at a 150 × 150 mm opening. At a 100 × 100 mm opening the weight is around half as much again; a 4 mm mesh at 100 × 100 mm weighs about 2.0 kg/m², i.e. around 12 kg per 3.0 × 2.0 m sheet.

What size steel mesh for a concrete slab?

Concrete mesh sizes depend on slab thickness, load and subgrade. The overview below is indicative and gives the usual UK, Australian and Dutch/Belgian equivalents; for anything beyond light domestic work, the engineer's drawing decides.

• Screeds and thin renovation floors: a light anti-crack mesh such as D49, or 4 to 5 mm wires at 100 mm. In a floating screed or with underfloor heating in a screed, this floor mesh often doubles as a fixing grid for the pipes.

• Patios, paths, sheds and light domestic slabs (about 100 mm thick): A142 in the UK, SL62 or SL72 in Australia, 6 mm at 150 mm in the Netherlands and Belgium. For a concrete patio without reinforcement mesh, synthetic fibres are the usual alternative.

• Driveways, garage floors and strip foundations: A193 or A252, SL72 or SL82, or 8 mm at 150 mm; the standard choice as soon as car traffic or point loads reach the floor.

• Industrial, warehouse and heavily loaded slabs: A393 or B mesh, 10 or 12 mm in the Netherlands and Belgium, often in two layers and always based on a calculation by the structural engineer. More on this in our article on warehouse and industrial floors.

The mesh also needs concrete cover above and below, so the slab thickness limits the choice: a thin slab leaves little room for a heavy mesh plus its cover. Check how thick a concrete floor should be before you choose the mesh.

For most of these floor applications there is also a mesh-free variant: for floors without heavy concentrated structural requirements, a structural macro fibre such as TwistR as a reinforcement mesh alternative without fixing work can replace the mesh, at dosages of 2 to 6 kg per m³ of concrete. When in doubt, have the comparison calculated: fibres do not fully replace traditional reinforcement in every situation.

Laying, lapping and fixing reinforcement mesh

A reinforcement mesh only works if it sits at the correct height in the concrete cross-section. It is therefore placed on spacers, in the UK often called chairs, so there is sufficient concrete cover below and above the steel; for exterior work usually at least 30 mm; at the underside of a slab cast on prepared ground or blinding at least 40 mm, and 75 mm where the concrete is cast directly against the soil (recommended Eurocode 2 values). A mesh lying flat on the subgrade that is not lifted during pouring does virtually nothing structurally: wrongly positioned reinforcement is a classic source of costly remedial work.

Where sheets meet, the rule of thumb is an overlap of at least one to two mesh openings: about 30 cm at a 150 × 150 mm opening (at least 35 cm with 10 or 12 mm wires). At a 200 mm pitch, 200 mm is enough only for light meshes with wires up to 6 mm (A98, A142); A193 and heavier need at least two pitches, so 400 mm. Laps of the main wires are calculated and are often longer, so the lap length on the engineer's drawing always governs, and flying-end sheets help to keep the laps flat. The overlapping sheets are tied together with tying wire or connecting clips, so the whole assembly does not shift during pouring.

On site this work falls under steel fixing, although with mesh sheets it is mainly a matter of lapping and tying rather than fixing loose bars one by one.

Mesh reinforcement also takes a substantial amount of labour: delivery, cutting to size around penetrations and recesses, positioning, tying and the reinforcement inspection before pouring together make up a complete extra operation that disappears with fibre concrete.

What does reinforcement mesh cost?

Prices of reinforcement mesh follow the steel price and vary with purchase volume and supplier. Indicative prices for the Netherlands and Belgium, 2026 price level, depending on project and market price of steel:

• 6 mm mesh, 3.0 × 2.0 m sheet: around €25 to €45 per sheet (€4 to €8 per m²).

• 8 mm mesh, 3.0 × 2.0 m sheet: around €45 to €75 per sheet (€8 to €13 per m²).

• Galvanised or made-to-measure sheets: a substantial surcharge over the untreated standard sheet.

In the UK, Ireland and Australia, the price follows the same steel market but varies by merchant and pack size. Compare quotes per m² rather than per sheet, because sheet areas differ: 11.52 m² for a UK sheet against 6 m² for a Dutch or Belgian one.

Cheap mesh from the DIY store looks attractive per sheet, but the sheet price is only part of the story. For a fair comparison, also count spacers, tying wire, cutting waste, transport and above all the labour hours for laying. In practice, the total costs of mesh reinforcement and fibre reinforcement often differ little, while the fibre route removes the separate reinforcement operation and the planning that goes with it. For heavily loaded floors, where steel fibres are the usual alternative, the steel fibre concrete price per m³ depends mainly on the dosage.

When can fibre reinforcement replace reinforcement mesh?

For many floors, the reinforcement mesh is no longer a given. Structural fibres are mixed through the concrete at the ready-mix plant and come out of the mixer ready to use: no delivery of sheets, no spacers, no tying and no risk of a mesh lying on the bottom of the pour. More background on this trade-off can be found in our overview of fibre reinforced concrete.

The choice is then between steel fibres or synthetic macro fibres: synthetic macro fibres such as TwistR (2.0 to 6.0 kg/m³) for floors and yards, hooked steel fibres such as MPZG HT+ 35/0.55 (10 to 35 kg/m³, EN 14889-1) for heavily loaded floors. The dosage always follows from the calculation.

Fibre reinforcement is usually a good alternative for:

• Floors on a stable, load-bearing subgrade: garage, shed, barn and industrial floors, yard paving and cycle paths.

• Screeds and underfloor heating floors, where crack control is the goal and a fine mesh mainly serves as shrinkage reinforcement.

• Projects under time pressure or with limited labour capacity, because the reinforcement operation disappears completely.

The reinforcement mesh remains the designated route for primarily structural elements with a dedicated reinforcement calculation (beams, columns, heavily loaded foundations), on soft or expansive ground where the mesh keeps both sides of a crack on the same plane, and wherever the specification explicitly prescribes mesh reinforcement. In those cases, a hybrid solution with less or lighter mesh plus fibres for crack control can still deliver gains. For rough agricultural floors, for example, the polyolefin macro fibre Wiking 4050 TR (EN 14889-2, class II) is a proven choice. How the options compare for barns, silage clamps and yards is set out in our article on fibre-reinforced concrete barn floors.

Want to know what this means for your project? Calculate the difference per m³ with the calculator or request a quotation with dosage advice. You will then receive the comparison between mesh reinforcement and fibre reinforcement for your specific floor.