Hardfoam ISO64 Insulation Board – 6, 10 and 20 mm (Tiles)

Ruby Home Hardfoam ISO64 insulation boards are pressure-resistant, waterproof polystyrene insulation boards specifically designed for use under tiled floors. Thanks to their high insulation value and rapid heat transfer, these boards are ideal for electric underfloor heating.

One board has a surface area of ​​0.72 m² (1200 × 600 mm).
Example: for a bathroom of 3 m² you need 5 panels (3 ÷ 0.72 = 4.1 → rounded to 5).

These high-quality insulation boards ensure a floor surface that heats up to 33% faster and increases the efficiency of underfloor heating mats. Because the ISO64 boards have a very low installation height, they are perfect for renovations or spaces with limited headroom.

The Ruby Home ISO64 boards have a reinforced mortar coating with a fibreglass structure on both sides — ideal for optimal adhesion and a durable, strong base.

Key Benefits of Ruby Home ISO64 Hardfoam Insulation Boards

• 100% water and rot resistant

• Fire resistant

• No moisture absorption

• Suitable for all types of underfloor heating systems

• Reinforced with high-quality mortar

• Full fiberglass reinforcement

• Excellent thermal insulation

• Strong noise reduction

Technical specifications

• Water resistance: water absorption < 0.5% (28 days under water – DIN 53 421)

• Temperature resistant: -30 °C to +70 °C

• Sound insulation:

  • Above floor: -5.6 dB

  • Subfloor: -21 dB

• Compressive strength: > 0.20 N/mm² (DIN 52 615)

• Insulation value: 0.039 W/mK (DIN 4108)

• R-Values:

  • 6 mm: 0.15 m² K/W

  • 10 mm: 0.26 m² K/W

  • 20 mm: 0.51 m² K/W

Installation advice

• Wooden subfloor: both gluing and screwing (recommended).

• Concrete/cement subfloor: gluing alone is sufficient (e.g. tile adhesive).

Available sizes

• 1200 × 600 mm , per board 0.72 m²

• Thicknesses: 6 mm, 10 mm and 20 mm

Perfect for bathrooms, renovation projects, tiled floors and energy-efficient underfloor heating with maximum efficiency.