A142 Mesh Specification Guide UK

A142 mesh is designed for light-duty domestic applications where crack control is the primary requirement. Ideal uses include garden paths, patios, and small shed bases (under 9m²) on stable ground. It's not suitable for vehicle traffic or structural applications. The 6mm wire and 200mm spacing provide adequate reinforcement for foot traffic while being the most economical mesh option.

The 'A' indicates it's an A-series mesh (200mm wire spacing, designed for ground-bearing slabs). The '142' refers to the cross-sectional steel area: 142 mm² per metre width in each direction. This designation system (BS 4483:2005) allows quick comparison - A193 has 193 mm²/m, A252 has 252 mm²/m, and so on. Higher numbers mean more steel and greater load capacity.

A142 mesh weighs 2.22 kg per square metre. A standard 4.8m × 2.4m sheet weighs 25.57 kg, a mid-size 3.6m × 2.0m sheet weighs 15.98 kg, and a small 2.4m × 1.2m sheet weighs 6.39 kg. This makes A142 the lightest A-series mesh, easy for one person to handle on site.

Calculate your slab area (length × width), add 10-15% for overlaps (minimum 300mm overlap required), then divide by sheet coverage. For a 3m × 3m patio (9m²): 9 × 1.15 = 10.35m² required. Using standard sheets (11.52m² each): 10.35 ÷ 11.52 = 0.9 sheets, so order 1 sheet. For larger areas, consider mid-size sheets to reduce waste.

A142 mesh prices at NextDaySteel start from £16.89 ex VAT for a 2.4m × 1.2m sheet (2.88m² coverage). Mid-size 3.6m × 2.0m sheets cost approximately £19.50, and standard 4.8m × 2.4m sheets around £27.50. Prices vary by supplier and quantity. A142 is typically 20-30% cheaper than A193, making it cost-effective for suitable applications.

A142 is not recommended for garage floors. NHBC Standards and industry practice specify A193 (7mm wire) as the minimum for domestic garages with occasional vehicle parking. A142's 6mm wire provides insufficient reinforcement for vehicle point loads, which can cause cracking and structural issues. For garages with regular vehicle use, A252 may be more appropriate.

A142 uses 6mm wire (2.22 kg/m², 142 mm²/m reinforcement), while A193 uses 7mm wire (3.02 kg/m², 193 mm²/m reinforcement). A193 provides 36% more steel cross-section, significantly increasing load capacity and crack resistance. A142 suits light domestic use; A193 is the standard for garages and larger slabs. The price difference is typically 20-30%.

Position A142 mesh in the top third of the slab, supported on spacers at 50mm from the top surface (providing minimum cover). Use plastic spacers every 600-800mm. Overlap sheets by minimum 300mm (one full square plus one bar) and secure with tie wire at 400mm centres. This positioning maximises crack control effectiveness on the tension face.