SELIT makes floors quieter - For more than 30 years
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Frequently asked questions about laminate, parquet, and vinyl underlays

Häufig gestellte Fragen

Here you finde the answers to the most frequently asked questions on our telephone support. We will gladly answer your specific questions by e-mail.

Since both laminate as well as parquet are good insulators, the merits of laying either product over an underfloor heating system should be carefully considered. Although it is possible to lay these products in principle, you should bear the following in mind: The thermal-conductance resistance of the entire floor construction (insulating underlay + laminate/parquet) combined should not exceed 0.15 m²K/W. The lower the value, the better the efficiency of the underfloor heating system.

We recommend using the following products for laying on an underfloor heating system:



Underlays must always be laid on wooden sub-flooring without a moisture protection film. If the sub-flooring is very uneven, we recommend the use of particle board flooring, which is laid with an intermediate layer of PE foam onto the old wooden floorboards and creates a level substrate. Impact noise insulation without moisture protection is then laid onto this surface.

Rising residual trapped moisture from the substrate (screed, concrete) can cause serious damage to laminate and parquet. Therefore, it is essential to protect its floor covering against moisture.

All products that use AquaStopTM technology offer suitable moisture protection. The combination products from the range offer this protection in the form of a pre-attached AquaStopTM film surface. This means that it is no longer necessary to lay an additional vapour-retarder.

We generally prohibit the use of underlay material on carpeted floors. On floors covered with shag pile velour carpets, there is a risk that the click-fit connections will be broken.

In addition, mould is very likely to form on the carpeted floor.

Furthermore, virtually all manufacturers of laminate and parquet floors recommend not laying laminate on carpeted floors.

The EPLF data sheet provides instructions about laying material over old coverings (Paragraph 5.4.5). Here too, it is recommended that existing carpeted floors be removed.

In general, we do not recommend the use of double layers of underlay. The 2 layers impair the pressure stability of the installation underlay and the resulting friction may lead to undesirable floor noises.

TÜV Cert DIN EN ISO 9001

TÜV zertifiziert

Certificate: 01 100 84025
The TÜV-Cert certification body of TÜV Rheinland certifies SELIT for the scope "Development, production and sale of innovative insulation materials for ceilings, walls and floors and the introduction and application of a quality management system in accordance with DIN EN ISO 9001:2008".

SELIT stands for quality and reliability - for more than 30 years!



The mark of conformity in the German Federal States identifies regulated and non-regulated construction products that comply with the underlying technical regulation, the national technical approval, the general supervisory authority test certificate, or the approval in individual cases.

In Germany, this is also known as the "Ü mark of conformity". The equivalent mark in Austria is the "ÜA mark". The conformity mark identifies the permitted use of a construction product in Germany.

All SELIT products have the Ü mark of conformity and therefore the national technical approval.

FSC® Mix


Cert. No. GFA-COC-001689
The Forest Stewardship Council® confirms that "ÖKOLIT® 5 mm wood fibre" is a product using responsibly sourced raw materials. This means that the "installation underlay is manufactured with a minimum content of 70 % certified and/or recycled fibres".

This product is certified as contributing to sustainable forest management.

Where there are high surface stresses or heavy loads, the pressure stability of the insulating underlay is the decisive criterion. Products made of polystyrene (such as SELITAC® 5 mm) are the first choice in this case because they achieve stability values of ≥ 90 kPa.

On cold floors, particularly in cellars, the insulating underlay fulfils an additional purpose: thermal insulation. The thicker the material laid here, the greater the insulating effect. Even 5 mm insulating layers such as SELITAC® 5 mm will result in significantly warmer floors.

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Links & References

EPLF®  Fact sheet

MMFA Fact sheet