What Flooring Is Best For Underfloor Heating
One of the most common questions property owners ask when considering underfloor heating (UFH) is, “What flooring is best for underfloor heating?” The short answer is that most floor finishes can be used with UFH, but they need to be considered at the design stage to ensure that the thermal resistance of the chosen floor covering does not adversely affect the system’s efficiency.
Best Floor Covering For Underfloor Heating
In general, harder surfaces such as stone and ceramic tiles are ideal for UFH because they have the lowest thermal resistance, offering the best heat output. On the other hand, coverings like deep-pile carpets and rugs have higher resistance and can reduce the system’s efficiency.
Each floor covering has a ‘tog’ rating, a measure of thermal resistance. For optimal performance with UFH, the combined tog rating of the floor covering and any underlays should not exceed 2.5 tog. When designing a UFH system, several factors are taken into account, including:
+ The flow temperature from the heat source (boiler, air-source heat pump, etc.)
+ The heat loss of the area to be heated, calculated based on the insulation value of the building fabric and windows/doors
+ The desired room temperature
+ The type of floor construction and the corresponding UFH system
Once these factors are established, we can determine the required pipe spacing and the rate at which water needs to be circulated to meet the heat loss. Ambiente designs all UFH systems in accordance with BS EN 1264 and CIBSE guidelines. It is crucial to inform us of the proposed floor coverings in each area of the property before producing the UFH designs. This allows us to factor in the thermal resistance of the chosen coverings to ensure accurate heat output calculations for each area.
Here is a summary of common floor coverings and their implications for use with UFH:
Ceramics and Natural Stone
Ceramic and natural stone tiles are the best floor coverings for UFH due to their density and low thermal resistance. These materials allow heat from the pipework to travel quickly through and warm the space above. All stone products, including slate and limestone, can be fitted over UFH. Ambiente recommends using a decoupling mat when installing stone products to allow for slight lateral movements and reduce the risk of cracks in grout joints.
Wood Flooring
Caution is needed when using wood flooring with UFH because wood is a natural product and reacts to environmental changes. It’s essential to check with the flooring manufacturer if their products have a temperature limit. If so, a floor probe should be used to limit the heating output to this level. Engineered wood flooring is generally more robust and less likely to react adversely to heat compared to solid wood floors, which contain more natural material and are more sensitive to temperature changes.
Carpets
Can you have underfloor heating with carpet? There is a misconception that carpets cannot be used with UFH. While carpets are among the highest-resistance floor coverings, they can be used if considered at the design stage. It is recommended not to exceed a combined resistance of 2.5 tog for the carpet and underlay. Using an underlay specifically designed for UFH helps keep thermal resistance as low as possible.
Rugs
Rugs are generally not recommended for use with UFH because they act as additional resistance to heat transfer. Heat can also gather beneath the rug, potentially causing temperature build-up that could damage the floor covering beneath.
Rugs can act as an additional barrier to heat transfer, which can reduce the overall effectiveness of the UFH system. Those with thick or dense materials, have higher thermal resistance. This means they can trap heat beneath them, preventing it from dispersing evenly throughout the room. As a result, the room may take longer to warm up, and the UFH system may have to work harder, leading to higher energy consumption. Placing a rug on a floor with UFH can lead to uneven heating. The area under the rug may become significantly warmer than the exposed areas, which can create an uncomfortable temperature disparity within the room.
Laminates and Vinyl
Most laminate and vinyl flooring is suitable for use with UFH. However, it is always best to check with the flooring manufacturer. These coverings are typically thin and high-density, which gives them relatively low thermal resistance.
One of the main reasons laminate and vinyl flooring are suitable for UFH is their composition. These materials are typically thin and have a high-density structure. This combination results in relatively low thermal resistance, allowing heat to transfer efficiently from the heating system to the floor surface and subsequently into the room.
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