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HiDeck Overlay 18

Innovative screed replacement system for use with a range of Warmup underfloor heating systems. Offers quick installation times and helps to enhance the energy-efficiency of floor heating.

Key Benefits


Screed replacement system

Protects the UFH system and offers a rapid installation.


High thermal conductivity

Improves system response times and reduces running costs.


Low-Profile Design

Can be used with all subfloor types and adds only 18mm to floor build-up.

HiDeck Overlay 18 is a low-profile overlay board for use with a range of Warmup underfloor heating systems including the VLo Ultra-12 Low Build System, the VLo Econna-12 Joisted Floor System, the Contura Floating Floor System and the Foil Heater. At only 18mm deep, it will have a negligible impact on floor heights.

Constructed using tongue-and-groove high-density gypsum, HiDeck Overlay 18 can be used in place of traditional liquid screed or levelling compounds for a faster install. It is ideal for acoustic application incorporating underfloor heating and its high thermal conductivity provides rapid system reaction times, enhancing the energy-efficiency of floor heating which helps to reduce running costs.

HiDeck Overlay 18 is suitable for installation with all subfloor types and directly accepts a wide variety of floor coverings, including tiles.

Technical Information

Product Documentation

You may also be interested in:


VLo Ultra-12 Low Build System

Low-profile water underfloor heating system, ideal for home renovations.


VLo Econna-12 Joisted Floor System

New and improved water floor heating system specifically designed for joisted floors.

Contura floating floor system

Contura Floating Floor System

Dry-finish hydronic floor heating system recommended for use with floating floors.

foil heater

Foil Heater

Electric underfloor heating mat offering a dry installation.

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Warmup offers an extensive range of electric and water floor systems compatible with all floor types, rooms and projects.

Electric Systems

  • ✓ Ideal for zones less than 25m²
  • ✓ Ideal for single rooms
  • ✓ Does not alter floor levels
  • ✓ Great for renovations

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Water Systems

  • ✓ Ideal for larger zones over 25m²
  • ✓ Rapid auto heat loss calculations
  • ✓ Compatible with existing central heating systems
  • ✓ Great for new-builds

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For areas of 24m2 or more, use our full quoting system
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