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XPS 400 Low Profile Overlay Board

Original price was: £12.00.Current price is: £10.63. (inc.VAT)

XPS400 overlay boards are used to install underfloor heating onto existing floor surfaces.  These panels can be secured to a solid subfloor and are perfect for retrofit installations.

  • Low profile – 20mm thick
  • High compressive strength of 400KPA
  • Holds 16mm pipe at 150mm spacing
  • 200-micron aluminium coating

XPS offers significant advantages over EPS.

*PLEASE NOTE: THIS PRODUCT HAS A MINIMUM ORDER QUANTITY OF 10 BOARDS*

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The XPS 400 low-profile overlay boards provide a simple solution for installing underfloor heating without lifting your floor. The panels are secured onto the existing floor making them ideal for retrofit installations.

Made from extruded polystyrene (XPS), the XPS 400 has a thermal resistance of 0.9 m²·K/W. XPS has several advantages over EPS such as water and mould resistance. The boards are compatible with all floor coverings, including laminate, carpet, tiles, vinyl, and engineered wood.

20mm and a compressive strength of 400 kPa, the overlay boards provide a durable and efficient solution for retrofitting underfloor heating systems. Each board houses a 16mm pipe spaced at 150mm intervals and features pipe channels, 180° turns, and return channels. The panels are secured with adhesive, easy to cut, and simple to install.

The overlay boards feature a 200-micron thick aluminium foil, which enhances heat distribution across the floor surface, enabling heat-up times as quick as 30 minutes.

Key Features:

  • Low Profile: The 20mm design ensures minimal height increase on existing floors.
  • Durable: With a compressive strength of 400 kPa, the boards can withstand heavy loads without compromising performance.
  • Foil-Coated Insulation: A 200-micron aluminium coating optimises heat distribution and system efficiency.
  • Easy Installation: Pre-grooved channels (spaced at 150mm) simplify installation and pipe routing.
  • Versatile Compatibility: Suitable for use with laminate, carpet, tiles, vinyl, and engineered wood floors.
  • Efficient Heat Distribution: The aluminium foil maximises heat output and comfort across the floor.

*PLEASE NOTE: THIS PRODUCT HAS A MINIMUM ORDER QUANTITY OF 10 BOARDS*

XPS vs EPS

The differences between XPS and EPS underfloor heating overlay boards

Thermal Resistance
XPS underfloor heating overlay boards provide nearly double the thermal resistance of EPS. XPS is the superior choice for reducing downward heat loss with thermal resistance values of 0.9 m² K/W for compared to 0.477 m² K/W for EPS. This higher thermal resistance is especially crucial for retrofit projects where lifting existing floors for insulation installation isn’t feasible.

Moisture Resistance

XPS boards, with their higher cell density, provide superior moisture resistance compared to EPS overlay boards. This makes XPS an ideal material for use at floor level where moisture exposure is a concern. In contrast, EPS may allow water penetration, resulting in gradual degradation of the insulation’s overall performance over time.

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