RetroTherm® Backer Board Cement-Coated Underfloor Heating Panel – 16mm Pipe

**RetroTherm® Backer Board panels are made to order with a lead time of 5 working days. Please contact our team on 01283 850040 to place an order.**

Engineered for durability and performance, the RetroTherm® Backer Board is a cement-coated, insulated overlay panel system. This system is particularly well suited to underfloor heating applications where a tiled floor finish is to be laid directly on top of boards.

Ideal for both retrofit and new build projects, these boards are also ideal for sub-floors with imperfections, as the tile adhesive fixing method can help overcome these challenges, often without the need for remedial work with self-levelling compounds.

Each panel features a high-density extruded polystyrene (XPS*) core, which is coated on both sides with a durable cementitious coating, reinforced with glass fibre mesh. This structure delivers excellent compressive strength and impact resistance, while also facilitating efficient heat transfer from the pipe to the floor surface.

These lightweight panels are easy to handle and cut. Pre-routed to accept 16mm underfloor heating pipe at 150mm centres, they suit both renewable heat sources and traditional gas boilers.

Thanks to their robust cement coating, RetroTherm® Backer Boards allow tiled floor coverings to be applied directly onto the surface using a suitable flexible tile adhesive. This is particularly helpful where build-up height must be kept to a minimum.

Whether you’re working on a concrete slab or solid timber joist floor, the RetroTherm® Backer Board system delivers strength, simplicity, and high thermal performance with a professional finish every time.

Need help calculating quantities or designing your system layout? Call our team on 01283 850040 for friendly, expert advice.

TECHNICAL INFORMATION:

• Panel size: 1200 x 600 x 20mm
• Panel coverage: 0.72m²
• Size tolerance: Length & Width +/- 1mm, Height +/- 0.2mm
• Pipe size: 16mm
• Pipe spacings/centres: 150mm
• Panel weight: 2.5kg
• Panel composition: Extruded polystyrene (XPS), with a glass fibre reinforcement mesh and cementitious coating (both sides)
• Compressive strength: 300kPa
• Thermal conductivity: 0.033 W/m·K
• Fixing method: Tile adhesive (moreFlex Rapid S1 Tile Adhesive) or screws