When the walls are tiled, shift work is the order of the day on the floor: It consists of decoupling, temperature control and a waterproofing layer before the tiles form the surface. Here’s how to properly build the bathroom floor.
Our renovated bathroom continues to take shape. But before the floor can be tiled, it must first be built. The individual layers are laid on top of one another and then form the perfect substrate for the tiles.
We decided on a floor temperature control system. In contrast to underfloor heating, temperature control works with electricity. This is a comfortable extra for warm feet but does not replace a full-fledged radiator.
Of course, it is possible to install fully-fledged underfloor heating based on hot water when renovating a bathroom. Underfloor heating requires additional space for the heating and control technology. If space is limited, this technology can also be placed in the basement.
Modern systems can now be used in very thin-layer structures. The covering construction has a total height of 32 mm, which not only has advantages in terms of renovation, but also ensures short heating times.
Renovating the bathroom: the floor structure
Due to the multi-layered structure, effective sound and heat insulation as well as the necessary sealing against moisture penetrating from above are achieved in such slim systems. Tile coverings are ideal for heat transmission, but other hard coverings such as laminate or parquet also work.
The floor filled with leveling compound needs a primer with deep primer before tiling.
Chisel a recess in the floor to insert the temperature sensor of the floor temperature control together with the cable.
Glue the decoupling mat to the floor with flexible adhesive. The notch of the spatula is 4 mm.
Product info: Decoupling mat
The mats are a polypropylene sheet with an undercut nub structure on the top, which is provided with a carrier fleece on the back. It is a universal substrate for all tile coverings as a so-called decoupling layer and also serves to accommodate electrical heating cables.
The floor temperature control system
The floor temperature control system is controlled by a temperature controller belonging to the system. You can use this regulator to heat the floor exactly when you need it. A total of up to nine switch-on times can be programmed per day, so you can regulate each weekday individually. When the bathroom is not in use, the floor stays cold. The temperature controller even shows the energy consumption if required. You should definitely leave the installation of the controller to an electrician.
The floor temperature control
Use a float to press the entire surface of the mat into the adhesive bed. Pay attention to the parallel course of the knobs at the joints.
The heating cable for the floor temperature control is pressed between the knobs with three knobs spaced from each other and towards the edges.
Glue the sealing membrane directly onto the decoupling mat with the inserted heating cable, also with flexible adhesive and a 4-tooth notch.
It is important to press the sealing membrane into the adhesive bed over the entire surface with the float. Under no circumstances should there be any cavities or bubbles.
After the adhesive has dried, you can stick the floor tiles directly onto the waterproofing membrane without a primer. Start on the long wall.
Use a 10 tooth trowel for floor tiles from 30 x 30 cm in size. Secure the 4 mm distance with cross tiles placed on edge.