B1131 Mesh - Steel Reinforcement - 12mm Long and 8mm Cross Bars
Alternative Names: B1131 Reinforcing Mesh, B1131 Steel Mesh, B1131 Concrete Mesh, B Mesh, Reinforcement Mesh, Steel Reinforcement Mesh, Concrete Reinforcement Mesh, 12mm 8mm Rebar Mesh, Steel Fabric Mesh, Reinforcing Fabric, Mesh Fabric, Reinforcing Matting, Steel Matting, Structural Mesh, Rectangular Mesh, Long Mesh, Extra Heavy Duty Mesh, Industrial Mesh, Commercial Mesh, ECO Mesh, Merchant Mesh, Flying End Mesh, Slab Mesh, Suspended Slab Mesh, Foundation Mesh, Ground Beam Mesh, Raft Foundation Mesh, BS4449 Mesh, CARES Approved Mesh
What is B1131 mesh used for? B1131 is the heaviest structural fabric in the BS 4483 range that we stock: 12mm main wires at 100mm centres deliver 1131mm² of steel per metre in the spanning direction, tied to 8mm cross wires at 200mm. It exists for one job, putting the maximum possible mesh steel into heavily loaded one-way slabs, and it does that in a single lift instead of hours of loose-bar fixing. Full specifications and a grade-by-grade comparison appear further down this page.
Typical applications
- The most heavily loaded one-way suspended slabs
- Transfer slabs and heavy structural decks
- Industrial floors under racking, plant or HGV loading
- Civil and infrastructure decks
- Schemes where B785 does not provide enough steel
B1131 sheet sizes & weights
- Area covered
- 2.88 m²
- Sheet weight
- 31.38 kg
- Price
- £62.98
- Area covered
- 11.52 m²
- Sheet weight
- 125.5 kg
- Price
- £116.90
Steel mesh grade comparison (BS4483)
Reinforcement fabric to BS4483. The grade number is the steel cross-sectional area in mm² per metre. Click a grade to view it.
| Grade | Main / cross wire | Pitch (mm) | Steel area (mm²/m) | Mass (kg/m²) | Typical use |
|---|---|---|---|---|---|
| A142 | 6 / 6mm | 200 x 200 | 142 | 2.22 | Shed bases, paths, patios |
| A193 | 7 / 7mm | 200 x 200 | 193 | 3.02 | Domestic drives, garage bases |
| A252 | 8 / 8mm | 200 x 200 | 252 | 3.95 | Driveways, light slabs |
| A393 | 10 / 10mm | 200 x 200 | 393 | 6.16 | Heavy slabs, car parks, rafts |
| B283 | 6 / 7mm | 100 x 200 | 283 | 3.73 | Structural, one-way |
| B385 | 7 / 7mm | 100 x 200 | 385 | 4.53 | Structural, one-way |
| B503 | 8 / 8mm | 100 x 200 | 503 | 5.93 | Structural |
| B785 | 10 / 8mm | 100 x 200 | 785 | 8.14 | Heavy structural |
| B1131 you are here | 12 / 8mm | 100 x 200 | 1131 | 10.9 | Heaviest structural |
| D49 | 2.5 / 2.5mm | 100 x 100 | 49 | 0.77 | Wrapping / screed |
B1131 mesh: frequently asked questions
What is B1131 mesh used for?
B1131 reinforcement mesh is used for raft foundations and the heaviest commercial slabs. It helps concrete resist tensile and load-bending forces so slabs are less likely to crack.
What size sheets does B1131 mesh come in?
B1131 is stocked in the sheet sizes shown above (2.4m x 1.2m (safety), 4.8m x 2.4m), and can be cut to size. The 4.8m x 2.4m sheet covers 11.52m² and the 3.6m x 2m sheet covers 7.2m².
What standard is B1131 mesh manufactured to?
Our B1131 mesh is welded steel fabric manufactured to BS 4483 from Grade B500 wire (BS 4449:2005), CARES approved with full mill traceability. (Reinforcement is certified through the CARES scheme rather than CE marking, as EN 10080 is not a harmonised standard.)
What size mesh do I need for a driveway or slab?
As a guide: A142 suits shed bases and paths, A193/A252 suit domestic driveways, and A393 is used for heavy-duty slabs, car parks and rafts. Always follow your structural engineer's specification where one is provided.
How much does B1131 mesh cost?
B1131 mesh starts from £62.98 + VAT for the smallest sheet size, and every current sheet price is shown in the size panel above. Bulk-buy discounts apply automatically as weight is added to the cart.
What does the 1131 in B1131 stand for?
The number is the cross-sectional area of steel in square millimetres per metre width: B1131 carries 1131 mm² of steel per metre in each direction. The higher the number, the more steel in the sheet and the stronger the reinforcement.
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