The device of waterproofing in a bathroom

Moisture and dampness are integral companions of any bathroom. Water has the property of penetrating microcracks, resulting in the destruction of unprotected concrete slabs under the floor covering, which in time will lead to the appearance of wet spots in neighbors on the ceiling.

Scheme of waterproofing the bathroom

Scheme of waterproofing the bathroom.

Therefore, the question of whether waterproofing is needed in the bathroom should not even arise.

If you are doing major repairs, in the bathroom you need to remove all floor coverings up to the concrete. Even if you had a waterproof layer, it must have been leaky from time to time, so it must also be removed.

Methods of the device

Technology of waterproofing the bathroom

Technology of waterproofing the bathroom.

Floors in the bathroom - a multi-layer structure, whose purpose is to protect against the penetration of moisture inside the floors. Usually it consists of a primer, waterproofing, screed and floor covering. Consider each layer.

As a primer under a floor covering it is possible to use practically any primer of deep penetration. All of them ensure good adhesion of subsequent layers to the concrete surface. However, now on the market there are special primers under the waterproof layer, the particles of which fill all the smallest pores of concrete, and then crystallize, creating an additional barrier to penetration of moisture.

The next layer is directly waterproof. It can be in the form of bitumen mastic or finished, in rolls. You can use both together. Still there are polymer-cement mixtures, which, simultaneously with hydroprotection, serve as a screed. It is not recommended to use roll materials based on polyethylene, because this material does not have sufficient vapor permeability, which creates additional conditions for the formation of condensate, and, moreover, is short-lived.

Floor waterproofing

For waterproofing the floor of the bathroom you can use roofing material.

Using bitumen mastic or a roll-based waterproofing based on bitumen, it is possible to arrange a good hydroprotection, this method is more durable than a layer of a polymer-cement mixture. The disadvantages of this method is that when it is installed, special care is required. The roll waterproofing must be laid out evenly, without the slightest cracks, always overlapping, with a wall entry of not less than 15 cm. If necessary, you can heat the sheets with a burner. All joints, the places of entering the walls and bypassing the water pipes for better results should be smeared with liquid bituminous mastic. On pipes it is necessary to use special rubber seals. If the waterproofing is arranged only with the help of a liquid mastic, it should also be applied with the approach to the walls in 2 layers. Another disadvantage of this method is that these materials have a sufficiently persistent and unpleasant smell, and the bathroom does not have windows, which creates a ventilation problem.

The device of a hydro-protective layer with the help of polymer-cement mixtures is a more economical option, since the same layer acts as a screed. With its help, you can immediately create a flat surface and raise the floor to the desired height. For reliability in the last layer of waterproofing it is worth drowning reinforcing mesh. According to the technology, the device of such waterproofing is similar to a conventional screed.


When using bituminous materials:

  • roller;
  • putty knife;
  • wide brush;
  • knife;
  • gas-burner.

When using polymer-cement mixtures:

  • mixing tank;
  • mixer with a drill;
  • trowel (trowel);
  • rule.

When constructing a waterproofing, it is necessary to understand that ordinary water is a universal solvent, so there is no too good a hydro-barrier.

If possible, reinforce the waterproofing: each layer of waterproofing is additionally primed, when installing floors from tiles, apply water repellent grout and special tile adhesive, and also monitor the condition of sanitary ware and water pipes.

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