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Underfloor Heating and Sceed Depth

When installing underfloor underfloor heating screed depth 100mm, it’s important to get the screed depth right. The underfloor heating cables are embedded within the floor and so need a thick enough layer to ensure they are fully covered, while also being able to withstand the foot traffic that will be placed on the floor.

Traditional sand and cement screeds are typically laid to a minimum thickness of 65mm, however they can go much higher. Modified sand and cement screeds, which have had fibres added to them (normally polypropylene), can often be used at up to 200mm. However, I would question going any deeper than this – it’s not really necessary and could cause problems.

Underfloor Heating Screed Depth: Guidelines and Considerations for 100mm

It is possible to use a thinner floor screed with underfloor heating, but I would recommend this only in new-build projects and where it can be poured directly over the insulation. It can be difficult to achieve the required levels of quality and consistency with a thin screed and there is a risk that the pipes will not be fully covered.

Pumpable flowing screeds, such as the Cemfloor Therm liquid floor screed system, can be laid to a much lower level than traditional sand and cement screeds, providing a more flexible flooring solution. They are available in a range of thicknesses from 25mm to 35mm for bonded applications and are usually based on anhydrite compounds with a calcium sulphate binder which are quicker and easier to lay than a traditional sand and cement.