Fastwarm 12.5mm Tile Backer Insulation Board

The Fastwarm® Tile Backer Board is a premium insulation panel designed to optimise the efficiency of Fastwarm® 150w/200w/cable underfloor heating systems. This 12.5mm version provides enhanced thermal performance while still maintaining a manageable board thickness for various floor builds.

Lightweight, rigid, and simple to shape with a utility knife, it’s ideal for both new builds and retrofits. Its high compressive strength and moisture resistance ensure a secure and long-lasting subfloor base for tiles.

Boards can be bonded with adhesive on solid floors or mechanically fixed to timber subfloors, providing flexibility across installation types.

• Waterproof – Fully waterproof construction, approved by Ultra Tile adhesive manufacturers.
• Great Insulation Performance – Thermal conductivity of just 0.032 W/mK helps minimise back loss of heat.
• Excellent Sound Insulation – Improves acoustic comfort in any room.
• Ultra-Lightweight & Easy to Cut – Easily trimmed on-site with a utility knife.
• Strong & Durable – Supports compression loads up to 30 tonnes per m².
• Multi-Surface Application – Suitable for walls and floors (follow correct installation methods).
• Flexible Installation Options – Mechanically fix to timber or bond to solid subfloors with adhesive.
• Standard Size – Each board measures 1200 x 600 mm (0.72m²).

This board is 12.5mm thick — ideal for improved insulation without excessive floor build-up. For a 10m² space, you'll typically need 14 boards.

Please note: Use a flexible tile adhesive with all floor types. Mechanical fixing is also required for timber installations at 300mm spacing.

Looking for a different thickness? We also stock: 6mm | 10mm | 20mm | 30mm | 50mm

Select the right thickness for your project’s insulation and height requirements.