Underfloor heating - so you can install them

There are numerous ways to install underfloor heating. This entry should give you an overview of the installation options of the heating system, and show which installation options can be realized later.

Wet and dry systems

Basically, one differentiates between the installation options between wet and dry systems.

wet systems

In the wet system, the pipe is fixed in different ways in the heating screed, and then enclosed by the screed.

Wet systems are the classic way of installing underfloor heating systems. They are still the most commonly used.

For fixing the pipes in the screed, there are several possibilities:

  • carrier mats
  • rails
  • Fixing on the screed insulation
  • Steel honeycomb panels into which pipes are threaded.
  • Velcro fastening

The fixing of the pipes within the screed in one of the above ways is absolutely necessary. They can not simply be laid freely.

Fixing materials and differences

For the attachment of the tubes on steel support mats are used today usually brackets. In contrast, rails are usually designed as clamping rails. You can hold the pipes by themselves.

The attachment to a support insulation is usually done with brackets. Because of the occurring damage to the insulating material (which is not permitted in accordance with the regulations) but you should rather refrain from the process.

The attachment of the pipes by means of Velcro strips on a nonwoven coated carrier mat is used more and more often today.

drying systems

Drying systems are particularly suitable for retrofitting, and whenever a low installation height is to be achieved.

One of the big advantages of dry systems is that floor coverings can be applied directly. This makes the floor heating more effective (small thickness between floor heating and floor surface), which is very energy efficient.

The assembly is usually carried out on a carrier insulation. It contains grooves and heat conducting lamellae to distribute the heat as optimally as possible. The pipes are attached directly to the support insulation.

Combi system with dry screed

A combination of dry screed panels and underfloor heating is also widespread. Milling in the dry screed plates takes up the heating pipes. The installation is particularly fast here due to the absence of drying times.

You can also install such underfloor heating yourself, since the laying of dry screed plates usually causes no problems even for laymen. The pipes used must then only be connected to the heating system at the end stations of the heating engineers.

Before the installation of the heating, however, a connection diagram and an exact dimensioning of the system by the heating technician is of course also required. The connection itself may not be made as a layman.

Due to the high potential inherent performance such systems are also very cost efficient. They are also suitable for the old building.

Installation heights

Thanks to the use of dry systems, particularly low installation heights can be realized. This is favorable to avoid subsequent problems with renovations and retrofitting in old buildings due to high floor construction.

Systems with mounting heights from approx. 8 mm are possible, but as a rule drying systems are at a construction height of approx. 20 mm. A special position is occupied by so-called thin-bed systems.

Tips & Tricks

In addition to the classic hot water heaters, there are of course also the electric underfloor heating / link]. But they are extremely uneconomical and are usually used only as additional heating.

Video Board: UNDERFLOOR HEATING GUIDE AND INSTALL PART 1 - Plumbing Tips