Overjoist Chip22

Part of the Warmis Dry Install Range

L shape finishing
Ply Covering 6mm
Pipe 12mm
Foiled & Routed Structural Chipboard 22mm
Full specification


Overjoist Chip22 is a chipboard low build up structural underfloor heating system designed to work well with heat pumps.

The panels ensure the pipe is in contact with the finished floor, this maximises the heat output of the panels. The system replaces the chipboard floor deck used in the construction of the floor. Overjoist panels have pre-routed channels to accept the continuous pipe, factory fitted aluminium diffuser strips enhance performance in common with all Warmis Dry Install Range .

The panels are laid on the joists in industry standard brick pattern according with the pipe installed by piercing through the soft temper aluminium diffuser strips. The ends of each circuit drop into the joist space and are fed to and from the manifold as a continuous system. The panels then require a 6mm flooring grade Ply screwed and glued to complete the structural deck.

Suspended floors may be of either a joisted or battened construction both can be heated efficiently and effectively with underfloor heating. Warmis have two solutions which will provide unrivalled performance for your property, both have been designed to work well with low temperature (40°-50° C) water so they are far more energy-efficient.


  • Low profile

  • Screed system


  • Dry install

  • Floating system

  • Low profile


  • Suspended system

  • Structural Strength

  • High thermal output

  • Acoustic integration

    Over Joist 28

  • Panel thickness


  • Minimum build up


  • Pipe diameter / Max loop length

    12mm /80 metres

  • Pipe centres


  • Weight with water & pipe no covering

    17kgs ㎡

  • Application

    Retro Fit / New Build

  • Heat pump friendly


With free technical support around the clock, you’ll always have access to assistance when you need it.


Order our products now

Request a project specific quote today!