Bottom left: Laminate is an increasingly popular solution for flooring Left: Wood floor temperature must not exceed 27°C
Floors, Walls & Ceilings
Opposite: The insulating element of carpet could prevent underfloor heating from transferring the heat efficiently to the floor surface
Below left: The best suited flooring materials you can use for underfloor heating are tile and stone
floor. The heat will build quickly and minimise heat loss. Some stone floors usually allow for 29°C of heat or more giving a high heat output of up to 200W/m². The thickness of the stone or tile is not recommended to be more than 20mm. This will allow for excellent heat conduction and retention.
Underfloor heating heat-up time
temperature and, as with carpet flooring, this means a certain maximum heat output which needs to be taken into account when choosing a system.
Carpet People still prefer carpet for a number of reasons. In the winter, it works as an insulator, and that could be a problem too when considering carpet for underfloor heating. The insulating element of carpet could prevent underfloor heating from transferring the heat efficiently to the floor surface, affecting the heat output of the system. Therefore, attention has to be paid to the overall tog rating of the flooring materials that should not exceed 2.5 tog. In other words, the total tog of the flooring coverings must not exceed this for the system to provide enough heat output. This includes any underlays and anything over the heater. Carpet is also subject to a top temperature restriction of 27°C. Moreover, it is advisable to compare the heat loss figure of a room to the maximum heat output before purchasing a system. The underfloor heating heat output must be higher than the heat loss in order for the system to provide enough heat.
Vinyl flooring Making a comeback in recent years, this material is well-suited for use with underfloor heating. Vinyl heats up and cools down quickly. However since vinyl is subject to a 27°C maximum floor temperature, this means that the heat output has a certain maximum although it also means that the system chosen with the vinyl flooring runs cost-efficiently.
Tile and stone The best suited flooring materials you can use for underfloor heating are tile and stone. These coverings are best at conducting heat and can therefore offer maximum value. Tile and stone are also great at retaining heat. To try this out, just walk across any stone floor that has had the sun on it. The resulting warmth is long-lasting. This, and a faster heat up time, is what makes tile and stone the best choices when considering underfloor heating. The high-quality heat output means that if you have a place that happens to be high in heat loss, like a conservatory, tile or stone would be the best options to lay as a
Your choice of flooring impacts the heat-up time depending on the material’s thermal properties. Materials with low thermal mass heat up quicker than materials with higher thermal mass. The heatup time and responsiveness of underfloor heating under any flooring material can be significantly improved by installing sufficient floor insulation, such as insulated underlay.
Underfloor heating heat output The heat output of underfloor heating must be higher than the heat loss figure of the room in order for the system to create enough heat. The maximum heat output of the system is directly linked to the floor temperature so your choice of flooring dictates the maximum floor temperature and the maximum heat output possible. In addition to the choice of flooring and the maximum floor temperature, air temperature also affects the heat output. As the comfort temperature is usually set at 21°C, and if the maximum floor temperature of your chosen floor finish does not provide enough heat output, you can change the flooring to a material that can be heated to a higher temperature, increasing the heat output. If you prefer not to change the flooring you have chosen, you may need to consider adding supplementary heating to get a heating system that provides enough heat.
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