Hardie Backer Water-Proof Board 1200 x 800 = 6mm

Hardie Backer Water-Proof Board 1200 x 800 x 6mm is a professional-grade fibre cement tile backer board engineered by James Hardie for use in high-moisture environments. Manufactured from 90% Portland cement and sand with proprietary MouldBlock™ technology, it delivers a dimensionally stable, waterproof substrate that outperforms plywood and plasterboard in wet conditions. Suitable for trade and DIY installations alike, it is the go-to cement backer board for bathroom floors, wet rooms, and kitchen subfloors across the UK.

Key Features and Specifications

• Dimensions: 1200 mm × 800 mm × 6 mm
• Weight: 9 kg per board
• Composition: 90% Portland cement and sand — no loose aggregates or fillers
• MouldBlock™ Technology: Prevents water absorption and mould growth for long-term integrity
• Load capacity: Up to 200 kg/m² tile hanging weight (residential timber stud applications)
• Reaction to fire: A1, s1-d0 — highest non-combustible classification
• EZ Grid recessed pattern: No-mesh surface for easy score-and-snap cutting and precise fastener placement
• Certifications: CE approved and BBA certified
• Warranty: 10-year limited product warranty
• Compatible adhesive: Cement-based tile adhesive

Applications

• Bathroom floor tiling — waterproof substrate over timber subfloors
• Wet room and shower floor preparation
• Kitchen floor overboarding before ceramic or stone tile installation
• Overboarding existing plaster or masonry walls in high-humidity areas
• Countertop and worksurface tiling substrate
• Compatible with ceramic, porcelain, natural stone, and vinyl tile finishes

Why Choose This Product

Unlike plywood or plasterboard, the Hardie Backer 6mm board will not rot, swell, warp, or delaminate — even under prolonged exposure to moisture. Its unique cement formulation provides up to three times the compressive strength of competing cement boards, while the lightweight, no-mesh design makes it fast to cut and fix on site. CE and BBA approval, a Class A1 fire rating, and a 10-year warranty make it a fully compliant, low-risk choice for both domestic and commercial tiling projects.

Delivery in and Around London

We deliver the Hardie Backer Water-Proof Board 1200 x 800 x 6mm throughout London, including inner boroughs such as Croydon, Lewisham, Southwark, Camden, and Hackney, as well as Greater London areas including Enfield, Bexley, Redbridge, and Barnet. We also supply to the surrounding counties of Kent, Essex, Surrey, and Hertfordshire. Trade quantities and bulk orders are welcome — contact us for volume pricing and scheduled site deliveries.