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Installing Electric Underfloor Heating Under Karndean, Amtico, Lino or Vinyl

by on March 7th, 2016


This article highlights important considerations for choosing and installing electric underfloor heating systems under Karndean, Amtico, lino and vinyl flooring. For more information or prices please call us on 01932 784848 or visit our main website (

Why Karndean, Amtico and Vinyl are ideal to install above electric underfloor heating mats.

  1. Because the Karndean, Amtico and vinyl are all very thin (about 7mm) that allow the heat from the electric heating mats to pass through easily. This gives the system a fast warm up time and high output making it an ideal floor covering.
  2. The fact that floor covering is thin also means that when retrofitting the floor build up is minimal. This can prevent problems with door heights skirting boards or allows you to add more insulation.

Things to look out for

  1. Maximum temperature – Karndean, Amtico and vinyl should not be heated to over 27C. It is important to have a floor sensor provided as part of the thermostat to make sure that the underfloor heating never damages the flooring.
  2. Special Adhesive – The manufacturers often specify that the floor covering be stuck down using a high temperature version of their adhesive. The high temperature version normally have a model number beginning with HT to denote its ability to withstand higher temperatures.
  3. Level floors – It is important that all the floor covering as fixed onto completely flat and stable subfloor floors. We would always recommend the use of flexible tile adhesive above the heating mats. If installing on a suspended wooden floor the 6mm ply needs to fixed to the floor boards similar to good practice to when you tile.

General installation guide

(1)  Preparing subfloor: Make sure that the subfloor is level and clean. If you are installing on a suspended floor with traditional floor boards then a 6mm layer of marine grade plywood will need fixed on top before laying the insulation.

(2)  Insulation: The type of insulation differs depending on the exact flooring, traffic over the area and subfloor construction. Please contact us (01932 784848) for details specific for your property. The insulation is stuck down with a flexible tile adhesive applied using a trowel.

(3)  Test mats

(4)  Fixing the mats down: The mats have to be fixed down very securely otherwise they will float up when the self leveling compound is poured ontop. To ensure this happens the floor has to be kept completely clean so that the adhesive of the mat has maximum contact with the insulation.

(5)  Test mats

(6)  The self leveling compound: Always use a flexible self leveling compound of at least 12mm thick. (thickness depends on subfloor, check with manufacturer)

(7)  Fixing the flooring ontop: Follow the flooring manufacturers guideline for laying the flooring. Many of them have their own high temperature adhesives which they recommend you using.

(8)  Turning the system on: The underfloor heating must be switched off 48 hours before, during, and 48 hours after the installation, then temperature gradually increased (typically 3°C/hr) to desired warmth.

For more information or prices please contact us on 01932 784848 or visit our main website.

This blog is only a guideline. Always read and follow the instructions of the self leveling compound and flooring manufacturer.

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