OverlayTM accommodates all types of projects and floor coverings and the only choice, is that of which panel will be most appropriate for the installation. Both OverlayTM and OverlayTM Lite can be used for the majority of projects. However, the choice of OverlayTM is determined by floor covering selection. OverlayTM and OverlayTM Lite can be used as appropriate in the same project.


The more structural nature of OverlayTM however, makes it more ideal for heavyweight floor coverings, direct tiling or application of floor finishes which need to be fixed or screwed to the panel.


With OverlayTM the pipe is laid in pre-grooved gypsum fibre panels installed between the structural floor and the floor covering.


Features & Benefits of using the OverlayTM system:

  • Low profile system (18mm deep)
  • No need to excavate existing floor
  • Simple installation
  • Suitable for multiple floor coverings
  • Strong and durable gypsum fibre boards
  • Ideal for both single room and whole house applications
  • Fast response times


Optimal floor coverings:

  • Ceramics
  • Tiles
  • Solid wood
  • Carpet
Material Requirements (Approx.)
Overlay™ Floor Panel Coverage 0.48m²
Pipe 7m length/m²
End returns 2 end returns per floor panel
12mm x 80m coil of pipe 1 coil per circuit
15mm x 12mm adaptors & stiffeners 1 pack per circuit
Overlay™ installation guidance
  • Step 1: Laying end returns

    Start by fixing two end returns to the floor in a corner of the room. Remove the pipe panel if not required as per your floor plan. This should be done by using suitable screws in the screw holes of the end return panels when fixing to a wood floor, or by using Overlay™ adhesive (Product Code: PB777) to bond the end returns to solid floors.

  • Step 2: Laying the panels

    Clean down the edges of the panel and apply a 3mm bead of adhesive to the top edge. Then lay it, ensuring you line up the grooves in the panel with those in the end returns. Continue to lay the first row of panels gluing each joint to achieve a secure installation.

    When gluing the ends, ensure there is no residual glue in the pipe grooves and use short lengths of pipe to help with panel alignment.

  • Step 3: Cutting the panels

    When you get close to the end of the first row, fit two end returns against the wall as shown in step 1 and if necessary cut an Overlay™ floor panel to fit and complete the first row.

    Cutting the panels
    Panels can be cut using a hand saw or jigsaw set at a low speed. Cutting these panels will generate dust so should either be done outside or in a ventilated room. Ensure you wear a particle mask.

  • Step 4: Repeat procedure

    Once you have completed the first row, begin the process again, gluing the ends and sides of each panel, staggering the panels in the second row in a brickwork pattern and continue until the room is complete.

  • Step 5: Laying the pipe

    Starting from your manifold position and allowing enough pipe for connections, lay the pipe into the grooves of the Overlay™ floor panel in accordance with your plan.

  • Step 6: Finishing

    Using a floor filler/grout, fill any gaps and voids, and fill around any pipework.
    Tiles can be laid directly on to the Overlay™ floor panels or a cover board can be fitted prior to tiling.
    When tiling directly over Overlay™ floor panels, use a sealant with flexible adhesive and grout.
    If fitting solid wood floors they can be discretely screwed through the tongue and groove directly into the Overlay™ floor panel, avoiding pipe circuitry, to minimise movement in the floor covering.

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