B1131 Mesh

B1131 Mesh is a heavy-duty rectangular reinforcement fabric designed to provide substantially more steel in its main direction. It uses 12mm main wires at 100mm centres and 8mm cross wires at 200mm centres, creating a strongly directional reinforcement pattern.

South Steel supplies B1131 Mesh for domestic, self-build, contractor and trade projects where this grade has been specified in structural drawings, calculations or a reinforcement schedule.

How B1131 Mesh Is Structured

B1131 is a rectangular mesh grade, so its reinforcement differs in each direction. The larger 12mm main wires are positioned closer together than the 8mm cross wires, concentrating considerably more steel along the main axis of the sheet.

Buyers should therefore match both the grade and orientation shown in the project documents rather than treating the mesh as a uniform grid. For structural concrete work, follow the engineer’s drawings or reinforcement schedule.

What the B1131 Grade Represents

The nominal specification is:

• 12mm main wires
• 8mm cross wires
• Main wire spacing: 100mm centres
• Cross wire spacing: 200mm centres
• Main steel area: 1131mm² per metre
• Cross steel area: 252mm² per metre
• Nominal mass: approximately 10.9kg per m²

The “1131” refers to the nominal steel area provided per metre in the main direction. This is considerably greater than the steel area across the sheet, which is why B1131 is classed as directional reinforcement mesh.

Where B1131 Mesh May Be Specified

B1131 Mesh may be specified for reinforced concrete elements requiring a high level of reinforcement in one principal direction. This can include heavier slabs, structural walls and other load-bearing concrete work, depending on the engineer’s design.

The grade, orientation and placement should match the project information rather than being selected by general application or sheet appearance.

Ordering B1131 Mesh From South Steel

Where B1131 is listed in the project documents, customers can order through the South Steel website. Larger or more complex requirements can also be quoted from drawings, material lists or reinforcement schedules.

This helps customers source specified mesh while keeping wider reinforcement requirements within the same order when needed.

Browse the reinforcing mesh range for additional grades, or explore the wider reinforcement steel range for rebar, cut and bent reinforcement and related accessories.

South Steel also supplies beams, columns, channels, angles and hollow sections through its structural steel range. As a UK online steel supplier, South Steel supports both product orders and drawing-based enquiries. Contact South Steel for product information or quotation support.