Waterproofing of the bathroom under the tile

Regardless of the type of housing, whether it is an apartment or a private house, the microclimate in the bathroom in it will differ from other rooms. Due to the active use of cold and hot water, steam and condensation appear, so the humidity level in the bathroom is always much higher.

In the process of major repairs, we must not forget about the importance of implementing a set of measures to protect the walls and floor from the effects of water before finishing the bathroom interior. Poor-quality or insufficient waterproofing can lead to unpleasant consequences from the formation of mold, mildew and damage to ceramic tiles up to a fire due to a short circuit due to moisture on the electrical wiring.

Materials for waterproofing

To perform internal high-quality waterproofing, insulating moisture-repellent materials are used. According to the type of application, there are two main groups of such materials:

  • Pasting-roll films, which are produced on the basis of resin (bitumen). They are glued or melted directly on the surface that needs to be protected;
  • Coating-a more practical and improved format of waterproofing. Coatings are ready-to-apply from the packaging or dry compositions that need to be mixed with water in the recommended proportion. Bituminous rubber and polymer mastics are applied with a tool to the treated surface, on which the tile will be laid in the future. After complete solidification, a final finishing finish is carried out.


Bathroom waterproofing technology

Before waterproofing, it is necessary to carry out preparatory work to eliminate damaged areas of the surface – irregularities, cracks, places of entry of communications, etc. For this purpose, you can use special repair mixes Teknorep 300 and Teknorep 300 EX.


After the preparatory work, you can start applying waterproofing materials, following the following sequence of actions:

  1. We ground the prepared and cleaned surface to ensure a high adhesive ability of the waterproofing with the base. For this purpose, the Izoplast E Nano Power acrylic deep penetrating primer is suitable;
  2. After that, it is necessary to cover the corners of the joints of the walls and floor with waterproofing along the width of the tape to seal the seams. Next, the Teknomer Pah Band 120/70 tape itselfis glued , after which it must be covered with a layer of waterproofing. In the areas of entering communications, you need to use special sealing cuffs, which are also sealed with a tape;
  3. After sealing the corners and joints with tape, a waterproofing elastic membrane is applied, which can be used as a waterproofing elastic coating Izoplast Hydrolastic, or a water-based polymer acrylic membrane Izoplast FH Special or Teknomer 300.
  4. The composition for waterproofing Izoplast Hydrolastic is two-component – it consists of a polymer emulsion and a dry fine mixture. When applied to the surface, the composition forms an elastic seamless coating with high strength. After the composition is completely dry, you can start laying tiles.


Adhering to the technology of using materials, you will get maximum protection and will be sure of its reliability and durability. And if you still have questions-call us, we will help you with the choice of materials and give advice on their use.

Acrylic primer Izoplast E Nano Power

Hydrophobic primer of deep penetration based on acrylic dispersion. Used for dust control and strengthen the top layer of grounds before applying another material.

The repair composition Teknorep 300 EX

One-component non-shrink repair compound reinforced with polymer fibers c increased flexibility and strength.

Tape for sealing joints Teknomer Pah Band 120/70

TPE elastic insulating tape for sealing construction joints.

Acrylic membrane Izoplast FH Special

Acrylic waterproofing membrane based on aqueous dispersion of polymers. Waterproofing inside premises with the increased humidity under the tile materials.

The elastic membrane Izoplast Hydrolastic

Izoplast Hydrolastic two – component polymer-cement elastic waterproofing membrane.

The repair compound Teknorep 300

One-component non-shrink repair compound reinforced with polymer fibers.

Dmitry Pismensky