B503 Mesh - Steel Reinforcement - 8mm Cross Bar
Alternative Names: B503 Reinforcing Mesh, B503 Steel Mesh, B503 Concrete Mesh, B Mesh, Reinforcement Mesh, Steel Reinforcement Mesh, Concrete Reinforcement Mesh, 8mm Rebar Mesh, Steel Fabric Mesh, Reinforcing Fabric, Mesh Fabric, Reinforcing Matting, Steel Matting, Structural Mesh, Rectangular Mesh, Long Mesh, Heavy Duty B Mesh, ECO Mesh, Merchant Mesh, Flying End Mesh, Slab Mesh, Suspended Slab Mesh, Foundation Mesh, BS4449 Mesh, CARES Approved Mesh
What is B503 mesh used for? B503 is a heavy structural fabric with 8mm main wires at 100mm centres and 8mm cross wires at 200mm, delivering 503mm² of steel per metre in the spanning direction. Manufactured to BS 4483, it suits one-way slabs under higher load than a B385 sheet can carry. The step up to 8mm wires in both directions makes it a genuinely heavy sheet while keeping the familiar 100/200 layup. Full specifications and a grade-by-grade comparison appear further down this page.
Typical applications
- Heavier one-way suspended slabs
- Structural floors spanning larger distances
- Industrial mezzanine and deck slabs
- Walls and panels under higher load
- Projects needing more steel than B385 provides
B503 sheet sizes & weights
- Area covered
- 2.88 m²
- Sheet weight
- 17.08 kg
- Price
- £29.45
- Area covered
- 11.52 m²
- Sheet weight
- 68.31 kg
- Price
- £69.25
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 you are here | 8 / 8mm | 100 x 200 | 503 | 5.93 | Structural |
| B785 | 10 / 8mm | 100 x 200 | 785 | 8.14 | Heavy structural |
| B1131 | 12 / 8mm | 100 x 200 | 1131 | 10.9 | Heaviest structural |
| D49 | 2.5 / 2.5mm | 100 x 100 | 49 | 0.77 | Wrapping / screed |
B503 mesh: frequently asked questions
What is B503 mesh used for?
B503 reinforcement mesh is used for suspended slabs and reinforced foundations. It helps concrete resist tensile and load-bending forces so slabs are less likely to crack.
What size sheets does B503 mesh come in?
B503 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 B503 mesh manufactured to?
Our B503 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 B503 mesh cost?
B503 mesh starts from £29.45 + 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 503 in B503 stand for?
The number is the cross-sectional area of steel in square millimetres per metre width: B503 carries 503 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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