Water underfloor heating without screed — dry installation

Water underfloor heating without screed

Water underfloor heating without screed is a lightweight dry installation system that avoids heavy concrete screed and reduces the load on the floor structure. This solution is suitable for apartments, houses with wooden floors, frame houses and SIP-panel houses.

Heating a house or apartment with underfloor heating is a comfortable and popular solution. There are both electric and water-based systems, but water underfloor heating is more versatile because it can work with different heat sources.

A water underfloor heating system can be connected to a gas boiler, electric boiler, solid fuel boiler, heat pump or solar thermal system. Heat is transferred through pipes by a water-based heat carrier. If the system is filled with antifreeze liquid, it becomes more resistant to the risk of freezing.

When is underfloor heating without concrete screed needed?

Underfloor heating without screed is useful when it is not possible to increase the load on the floor structure, when there is not enough floor height, or when wet concrete works are not suitable. This system is often used in apartments, renovations, wooden houses and lightweight frame structures.

1. The floor structure cannot take additional load, because a concrete screed can weigh up to approximately 350 kg/m².
2. The house or apartment has already been renovated and there is not enough height for a traditional screed.
3. Concrete works may contaminate walls, doors and finished interior surfaces.
4. There is no time to wait for the screed to dry.
5. The house has wooden floors, where a heavy screed can create unnecessary structural load.
6. The cost of concrete works is too high or technically unjustified.

Why is electric underfloor heating not always suitable?

Electric underfloor heating can be easier to install, but it is not always the best solution for permanent heating. Its main limitations are higher operating costs, additional load on the electrical network and dependence on available electrical capacity.

1. Higher system and operating cost, especially for large heated areas.
2. Additional load on the electrical network of the house or apartment.
3. Limited ability to connect the system to alternative heat sources.

A dry water underfloor heating system combines the advantages of water-based heating with lightweight installation without concrete screed.

What is a dry water underfloor heating system?

A dry water underfloor heating system is a floor construction made of polystyrene boards, heat distribution plates and water heating pipes. It is installed without pouring concrete, has a low weight and can be put into operation quickly.

The system is based on polystyrene boards with grooves for the pipe and aluminium heat distribution plates. The plates transfer heat evenly from the pipe to the floor finish, while the boards form a lightweight base for laying the heating circuit.

Advantages of water underfloor heating without screed

The main advantage of the dry floor system is its low weight and fast installation. It makes it possible to install water underfloor heating where a traditional concrete screed is undesirable or technically impossible.

1. Lightweight construction. The system weight is approximately 30 kg/m².
2. Suitable for different floor structures. The system can be used on concrete and wooden floors.
3. Low build-up height. The floor level increases by approximately 50 mm.
4. Additional thermal and sound insulation. Polystyrene modules improve the insulation properties of the floor.
5. Fast installation. Installing the system in a 60 m² apartment may take approximately 3–4 days.
6. Connection to different heat sources. The system can work with a boiler, heat pump or solar thermal system.
7. Lower weight compared with screed. This is important for renovations, apartments and wooden floor structures.

Underfloor heating without screed under laminate and tiles

A dry water underfloor heating system can be used under laminate, tiles, linoleum or carpet. The floor build-up depends on the final floor covering: laminate usually requires a suitable underlay, while tiles normally require an additional layer of gypsum fibre boards.

Disadvantages and limitations of the system

A dry underfloor heating system requires preliminary design, correct module layout and a level base. It also must not be connected directly to high-pressure systems, such as a municipal central heating system, without an appropriate technical solution.

How is dry water underfloor heating installed?

Dry water underfloor heating is installed in several stages: base preparation, module laying, installation of heat distribution plates, pipe laying, preparation for the final floor covering and system testing.

1. The floor is cleaned and levelled. During renovation, laminate, linoleum or carpet can be removed and then installed again after the system is completed.

1. Polystyrene boards with grooves are laid on a level base. If the floor is wooden, it is advisable to provide a waterproofing layer beforehand.

1. Heat distribution plates are then installed.

1. The underfloor heating pipe is then laid as a continuous circuit.

1. If the final floor covering is tiles, carpet or linoleum, gypsum fibre boards about 10 mm thick are additionally installed.

1. If the final floor covering is laminate, a suitable underlay is installed and the laminate is laid according to the manufacturer’s recommendations.

Laying laminate or tiles over a modular system

The final floor covering should be selected with regard to thermal conductivity, manufacturer requirements and the floor structure. For laminate, it is important to use flooring compatible with underfloor heating. For tiles, a stable base is required to distribute the load evenly.

Price of water underfloor heating without screed

The estimated price of a dry water underfloor heating system is 720 UAH/m².

This price includes polystyrene boards, heat distribution plates and pipe for underfloor heating. The current price should be confirmed before ordering, as it depends on the system configuration, floor area and material costs.

The system can also be completed with a distribution manifold, an electric boiler of the required capacity and a programmable thermostat.

Conclusion

Water underfloor heating without screed is a practical alternative to traditional concrete screed and electric underfloor heating. It has a low weight, installs quickly, is suitable for renovation projects and can work with different heat sources.

To compare different solutions, read our comparison of water heating systems.

For energy-efficient operation of underfloor heating, it is also worth considering a heat pump as a heat source.

Call or message us via Viber or Telegram if you want to clarify the price, system configuration or installation options for dry underfloor heating in your house or apartment.

Viber: +38 (050) 358-22-82

Telegram: +38 (097) 515-38-39

Pavlo Biriukovych, energy-efficient construction consultant

P.S. This system can be used not only for underfloor heating, but also for warm wall systems or passive cooling systems with a heat pump.