Waterproofing a bathroom under the tile: what is better to use under the tile

When repairing a bathroom, waterproofing of the bathroom under the tile is always carried out, which is better to do with the assistance of a qualified specialist.

If this is not possible and the work is planned to be performed independently, it is necessary to become familiar with the requirements for moisture protection, materials and methods that are used for these purposes.

Basic requirements for waterproofing

Proper implementation of waterproofing protects the finish of floors, ceilings and walls from the damaging effects of moisture, prevents mold, provides protection from flooding of the premises below.

In order for waterproofing to cope with these tasks successfully, it is necessary to ensure its compliance with certain requirements. The main can be considered the following:

  • the rapid application of funds will allow to form a complete coating and will not allow the occurrence of cracks and cracks;
  • minimum intervals between the application of layers - each subsequent should be laid immediately after the previous one has dried, which will provide the best hitch;
  • compliance with the recommended parameters of overlap when laying roll source with insulation on the walls when creating a floor moisture protection.

In addition to the above, it is recommended to use a primer, which allows you to save on the number of sources and improve adhesion to the insulated surface. Before performing work it is necessary to clean the surface as much as possible.

The scheme of partial waterproofing of the bathroom
With partial tile laying, full insulation is not required. Hydrobarrier is created near the bathroom, sink, and in the combined bathrooms - on the wall adjacent to the toilet

If it is not possible to isolate the bathroom completely, you can limit yourself to the most exposed to water areas, more than others suffering from moisture.

Types of waterproof materials for the bathroom

On the shelves of hardware stores there is no shortage of special moisture protection agents. It will be difficult for an unintended buyer to make a choice if you do not know their types and purpose.

Basically, materials are divided into components that are used for their manufacture, structure, and specific properties:

  • mastic used by coating surfaces;
  • roll fixtures, which are applied by pasting;
  • pastes and liquid products;
  • penetrating mixtures used for application to porous bases.

In addition to the listed materials, powder mixes are suitable for moisture protection of the bath, designed to create waterproofing solutions by dilution.

With irregularities on the walls, you can use a special plaster, in addition to resistance to the effects of a wet environment, it will ensure the leveling of the surface. Finally, for the same purpose, a film of polymers or rubber is often recommended, which is applied by spraying and forms a powerful barrier after drying.

Action of penetrating composition
The penetrating isolation prevents moisture absorption by porous surfaces from inside and outside, ensures the safety of the base

Selecting a suitable isolator, you need to focus on the recommendations of the instructions, which usually indicate the scope of a particular tool.Should choose materials recommended for use in indoor spaces.

Barrier under tiles for floors and walls

Waterproofing of the walls and floor can be performed by any composition, but it has its own nuances. Walls usually do not require high-level moisture insulation. Paul, by contrast, needs more protection.

Optimal flooring materials

To protect the floor from the detrimental effects of a wet environment, protective equipment is combined with a screed. Under it lay rolled insulators. They are easy to use - special adhesive strips are provided for fastening individual strips.

An alternative to them are coating pastes that benefit in durability and efficiency. They are applied under the screed and over it, well combined with penetrating mixtures. The combination of such mastic, applied under the screed, with penetrating impregnation on top of it, is able to provide the most effective hydro-barrier.

Barrier options for walls

Materials for the walls to choose easier. To protect against moisture penetration, any of the above listed compounds can be used.If you plan to do the work yourself, you should choose what is easiest to apply / use.

When the material factor is important, the cost savings will be ensured by one-component mixtures that are diluted with water and are inexpensive. Two-component involve the use of polymer emulsions and are more expensive.

Coating mixtures
Coating mixtures provide effective protection of surfaces against moisture, retain desired properties for many years.

As with the floor under the tile on the walls, it is usually recommended to apply coating or impregnating mixtures that are easily applied independently, do not burden the budget with significant expenses.

Possible methods of waterproofing

When working with any protective equipment, pre-leveling of surfaces and their primer is often required. After drying, the composition can proceed to the main work. If the insulation will be performed independently, it is advisable to select the most affordable technologies that do not require special equipment and special skills.

Coating application mastic

Such compositions are recommended to be used in rooms that have a complex layout.They allow you to carefully handle the corners and protrusions.

Leveling and priming
In the presence of irregularities, the base is leveled, which ensures tile laying without distortions in the final stages of work.

Among the most popular options are usually distinguished polymer blends, polymer-cement and bitumen. They easily penetrate into the pores, isolate cracks, form an effective moisture barrier that does not crack for many years.

The advantage of such mixtures is ease of use:

  • before applying the floor or walls are cleaned of dust and debris, if necessary, level, moisten or treat with primer, which increases adhesion;
  • the dry mixture needs to be diluted with water with a temperature not less than room temperature, in the ratio indicated in the instruction;
  • the composition is thoroughly mixed with water until a state of uniformity, allowed to brew for up to 5 minutes, then mixed again and proceed to the application.

Mastic is distributed over the surface in two layers immediately after the last mixing. After the first, the corners are glued with a special tape, which is carefully pressed into the insulation and straightened.

It prevents the penetration of a wet environment, allows you to maintain a holistic barrier, which is especially important in the corners and at the joints.

Waterproofing tape
Insulating tape will keep the integrity of the moisture barrier in the corners and at the joints, will not allow its destruction with a slight "course" of the building

After completing the application of the first insulation layer using this type of material, reinforcement with mesh is carried out and another one is placed on top, repeating the procedure from the beginning. It is important to completely close the previous layer.

Impregnation rules

Impregnating compounds are mixtures that penetrate deep into the structure, completely fill all cavities, strengthen, form a durable hydro-barrier, increasing the level of surface hydrophobicity.

This may be polymers, bitumen compositions, liquid glass and other options. Just as in the previous case, the base is cleaned and primed, then the following steps are performed:

  1. Dry formulations are diluted according to the manual per half hour of work, after which the mixture dries out and becomes unsuitable for use.
  2. After applying and drying the first layer, the base is re-treated.For applying the mixture, you can use a roller or brush, depending on the consistency.
  3. When work is finished, surfaces give time to dry. Depending on the composition, it may take several days.

It is recommended to periodically wet the surface during the entire drying period, which will ensure good crystallization of the insulating agent.

Bituminous formulations
Bituminous compounds without certain additives can be hazardous to health, because they emit hazardous substances, therefore it is recommended to choose polymer materials for interior

An additional advantage of any penetrating composition is the possibility of using it to restore the integrity of the old insulation, which has lost its original characteristics.

Technology of use of rolled materials

In this case, you can use several options for roll media. Fiberglass insulators are durable, have low sensitivity to rotting, but are expensive, require careful installation, and are easy to damage.

Rolls of roofing material or asphalt are cheaper, but they quickly become useless.Depending on the complexity and the equipment used, there are three laying technologies:

  • fasteners- rolls are laid on the floor and fixed with special fasteners, which are then further isolated;
  • heat gun- it creates a certain temperature regime necessary to melt the applied coating;
  • adhesive compositionsor polymer-bitumen mixtures, the latter form an additional protection against moisture.

Options with fasteners and the use of a heat gun are rarely used for waterproofing a bathroom.

Roll materials
Before laying roll materials, it is recommended to unfold them and leave them in such a position for a day to ensure a more even distribution of the coating, without bubbles

The best way is considered to be gluing, which is accessible to non-professionals and does not require special equipment. Before starting work, check whether the surface alignment is required. If necessary, make a concrete screed.

Then the joints are rounded, which will help prevent the occurrence of cracks. After standard cleaning, drying and primer proceed to the laying of the material:

  • the rolls are cut into pieces of the required length, the rolled strips are treated with solar oil for greater elasticity and kept in that position for 24 hours;
  • the screed on top is treated with a coat or with an adhesive compound and overlapped the rolls according to the manufacturer's recommendations;
  • if bubbles appear, they are opened, the edges of the incision are treated with mastic and re-pasted, carefully smoothing.

At the meeting place, the walls with the floor rolls bend and lead to the walls up to 15 cm, which ensures the reliability of waterproofing.

Applying waterproofing plaster

Option with the creation of plaster moisture protection involves the use of polymeric additives that increase the hydrophobicity of the base. The technology is almost not different from the application of coating mixtures.

Plastering waterproofing
Plastering waterproofing is multifunctional, it not only forms a stable barrier to moisture, but also eliminates irregularities that are critical when gluing tiles

After the required surface preparation, sealing tapes are glued on the corners and joints. Then the prepared solution is applied in 2-3 layers in different directions.For example, the first is vertically directed movements, the second is horizontal.

Wood floor protection from moisture

It is not recommended to use insulation with a concrete screed for a bathroom in wooden buildings. It increases the load on the foundation and increases heat loss. For this reason, the main way of arranging the floor is lag.

Even at the planning stage of the house should provide flooring in the bathroom below the general level of about 10 centimeters. This will create the necessary barrier to the entry of water into other rooms in the event of a leak.

Paul on logs
Lag version of the floor involves coating insulation of the foundation and the use of moisture-resistant insulation in the cavities between the lags

One of the common options for isolation of the field in this case is a coating one. Before applying mastic, preliminary preparation is necessary:

  • all slots, holes close up with special mastic for wood;
  • the floor is thoroughly cleaned;
  • treated with antiseptic impregnation, which will prevent the occurrence of mold;
  • The primer remains an obligatory stage of preparation, which increases adhesion with the insulator.

If necessary, alignment can be applied sheets with cement-base, which are put in two layers. When the preparation is finished, the floor is given time to dry out and proceed to the main work. First of all, isolate all joints with a special tape.

Next, with the help of a roller, the first layer is laid, a spatula or brush is used in the corners. After it dries, which takes about 6 hours, impose a second layer strictly perpendicular to the first. During the day, the insulation is dried, then perform tile work.

Creating a barrier for wooden walls

Just as in the case of the floor, the walls must be pre-treated with an antiseptic, the available slots must be sealed with mastic. The surface can be treated with wax, which will protect the wood from deep penetration of moisture.

Next, apply a double layer of primer, increasing its density closer to the ceiling, where condensate usually accumulates. After drying, roll materials are laid or coated. In the latter case, the work is performed as follows:

  • pre-application will require leveling the surface, which is achieved with plaster on beacons using a level;
  • corners are also insulated with tape;
  • mastic is applied with a brush or spatula with a wide profile.

If you plan to partially tiling, the area in the sink, toilet and bathroom area is coated with three layers of mastic. Each of them is applied after drying the previous one. The tile is laid on completely dried insulation.

Waterproofing wooden walls
The walls in the bathroom of a wooden structure can be insulated with any material, including rolled, but most often used are mastic coatings.

Conclusions and useful video on the topic

Video # 1 steps to create a moisture barrier in the bathroom with recommendations and explanations:

Video # 2 about the features of applying insulation to a dusty floor and other errors when repairing a bathroom:

Video # 3 on the quality of work on moisture insulation, tips on choosing materials:

When planning a waterproofing of a bathroom, it is necessary to decide not only on the types of relevant materials, but also on brands. On the shelves of construction stores there is no shortage of such compositions, but, as a rule, the highest quality ones remain imported.

To avoid mistakes, it is best to listen to the recommendations of experts. Usually, useful tips can be given by sellers of specialized stores, where personnel are selected based on relevant experience.

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