Electric Underfloor Heating Under Wooden Floors
Posted 11 Mar 2016
9 Key points to safely using electric underfloor heating under wood floors
(1) Moisture content
This is mainly an issue with solid wooden floors but it is important that the moisture content of the floor is kept at 8%
or less to avoid warping. Check with the manufacturers upon ordering and make sure that the wood in transported and stored
in a dry environment
(2) Thickness of wood flooring
Wood in not a great conductor of heat so the thinner it is the higher the output of the system and the faster the warm up
time. The maximum recommended thickness is about 18mm (thicker floors are possible but at a lower output).
(3) Floating floor
Obviously you can’t nail a wooden floor down if you an electric underfloor heating mat underneath. All floors must be floating.
It is possible to stick down wooden floors but you need a different mat. Call the office for more details.
(4) Wooden floor underlay it is possible to use a specialist wooden floor underlay over the electric underfloor heating mat but make sure it’s thin and is not the foil reflective type.
(5) Maximum floor temperature
Wooden floors should never get above 27C. The room thermostats should have a floor probes which will automatically shut of
the underfloor heating if the floors get above this temperature. All of Rayotec’s thermostats have floor probes to protect
(6) Let your flooring acclimatise
After you have installed the wooden flooring do not turn on the underfloor heating until the flooring has acclimatised. The
length of time depends on the thickness of wood but it is typically 7-14 days.
(7) Expansion gap
An expansion gap should always be left around the flooring. This is typically between 10-30mm (ask your flooring supplier
for more details).
(8) Earthed system
All of Rayotec’s electric underfloor heating mats are earthed.
Insulation reduces warm up time and running costs and protects the matting. Rayotec supply the advanced Palziv system that
not only has fantastic insulation properties but is also much easier and faster to install when compared to traditional
What is the best flooring for electric underfloor heating
Electric underfloor heating under laminate floors
Laminate flooring is the best to install over electric underfloor heating. As it is thin (about 7mm typically) the heat travels
through it very easily giving you a good output and fast warm uptime. Laminate generally copes well with changes of temperatures and doesn’t warp easily.
Electric underfloor heating under engineered board
Engineered boards are also very good with under floor heating. They range in thicknesses but generally the thinner the better. A typical thickness of 14mm would be perfect but up to 18mm in possible although with a slightly reduced output. Engineered boards are designed not to warp easily which is also a big benefit.
Electric underfloor heating under solid wooden floors
Solid wooden floors are not a problem as long as you ensure that the moisture content is 8% or lower and the wood ideally 18mm think or less. Always check with your flooringn company for suitability before ordering.
The Rayotec Underfloor floor heating system – Rayoflex
Rayotec sell the advanced German engineered Rayoflex mat. This is a fully earthed mat with an output of 150W/m2 that is incredibly easy to install. In fact two competent people can lay over 100m2 of Palziv insulation and Rayotec flex electric underfloor matting in a day! The mats range in size from 1m2 to 10m2 and multiple mats can be used to heat one room.