Amber Underfloor Heating’s technical manager, Steven Burnett, shares expert advice on subfloor preparation to ensure optimal system performance from electric underfloor heating installed beneath tiled floors.
Correct subfloor preparation is one of the most important factors in achieving efficient and reliable performance from an electric underfloor heating system.
As specialists in electric underfloor heating, we know that careful preparation helps improve heat output, system responsiveness and long-term performance.
So, we’re sharing our top tips for subfloor preparation when it comes to installing electric underfloor heating under tile.
Plan the floor build-up carefully
Careful planning of the floor build-up is essential for achieving the best results from electric underfloor heating systems.
Installers should consider the substrate type, insulation requirements, floor finish and heating output specification before installation begins. Taking these factors into account early in the design process can help avoid performance issues later on.
Prioritise insulation where possible
Wherever possible, we recommend using a tile backerboard, especially when installing on a cementitious substrate without insulation.
Although it is not a substitute for high-performance insulation, it will help direct a greater proportion of the heat upwards into the floor finish, resulting in improved system efficiency and floor warm-up times, as well as minimised downward losses.
When installing onto a wooden substrate, a tile backerboard is required where a 150W/m² heating mat is specified.
On top of better performance, incorporating insulation strategies into the floor build-up can also help reduce running costs and improve overall system responsiveness.
Ensure the substrate is level before installation
Before fitting the underfloor heating system, the subfloor should always be levelled to create a flat and consistent surface to maintain a uniform heating depth.
An uneven substrate can result in varying depths across the heating mat installation. For example, where the mat sits deeper beneath the floor finish, heat transfer can be reduced, while shallower areas may produce increased surface temperatures.
This can lead to inconsistent heat distribution and unwanted hot or cold spots across the tiled floor.
Technical support from Amber Underfloor Heating
Here at Amber, our team are always on hand to support our customers.
With a free design and quote service and extensive pre- and post-sales support, our knowledgeable team helps you get the best from your system. Find out more about Amber at our website.
