Specialization: Capital construction works(laying the foundation, erecting walls, constructing a roof, etc.). Internal construction work (laying of internal communications, rough and final finishing). Hobby: mobile connection, high tech, computer technology, programming.
I had not yet had time to take a break from communicating with Odessa's aunt Sonya, who had recently been choosing wallpaper for the toilet, when she needed a new consultation. She decided to continue the renovation in the sanitary facilities and as decorative finishing she liked decorative plaster for the bathroom.
And now - she again at my door with urgent requests to tell her about what material it is better for her to buy and how to use it. I decided to cut short any additional visits right away by telling her everything I knew about plasters for wet rooms. In any case, he also mentioned how the walls are plastered under the tiles (suddenly she changes her mind and chooses another option under the tiles).
Having got rid of the annoying visitor, I decided on my own to systematize all the knowledge about which plaster to use in the bathroom. I will present the results of my theoretical research to everyone who loves to make repairs with their own hands. I hope this guide will help you determine which is better, cheaper, prettier, stronger, and so on.
Types of plaster for bathrooms
I will not annoy you with various lyrical digressions, with which our conversation with Aunt Sonya abounded, but I will only talk about those types of plasters that I personally recommend using in plumbing rooms where air contains a large number of water vapor.
Sanitizing mixtures
First, I will describe what a sanitizing plaster is. This group includes various finishing compounds used to prepare surfaces before their subsequent finishing with decorative materials.
To give the plaster mixture special properties, additives, modifiers and plasticizers are added to the usual cement-based composition in production, which give the solution greater plasticity, but increase the setting time. After surface treatment with rough sanitizing plasters, walls can be applied decorative material after at least 7 days.
Ordinary plaster (cement under the tiles) without sanitizing properties is not suitable for treating walls in the bathroom, since it does not have waterproofing properties. As a result, salts contained in moisture appear on the surface of the walls (efflorescence appears). Gradually, the sub-tile layer collapses, microorganisms appear on the wet surface, and the glued tile falls off.
The use of sanitizing plaster mixes avoids a lot of troubles:
- Plaster insulates subsequent layers from moisture entering through walls and foundations(e.g. wallpaper, paint or facing materials). Therefore, the decorative finish retains its attractive appearance throughout the entire period of operation.
- The composition with sanitizing properties acts as an independent waterproofing layer, but is able to remove internal moisture from the room through the building envelope. That is, the plaster is vapor-permeable and contributes to the natural regulation of the humidity level in the bathroom.
- The material forms an elastic layer and does not crack during operation due to possible shrinkage of the walls... Therefore, such plaster can be safely painted or glued to the surface of the wallpaper (when using such finishing materials, you need to worry in advance about what to do finish alignment plaster).
Renovation plaster mixes are ideal for treating walls that may come in direct contact with water. Therefore, if you decide to make an open shower cabin, tiling its surfaces with tiles, you cannot do without such material.
Decorative plaster in the bathroom perfectly fits on the sanitizing layer. Therefore, I advised Aunt Sonya, since she had not decided on topcoat, to start work with plastering surfaces with a sanitizing compound. While it is dry (which takes about a week), she will have time to choose and buy the finish.
By the way, it is the long hardening period that explains the dislike of bathroom decorators for this material. I have already mentioned that it takes at least a week for sanitizing plaster to harden. But this is in the event that it is applied in a layer of 1 cm.
Gypsum plasters
Many people ask if it is possible to plaster with gypsum plaster in the bathroom. After all, the main binder in this composition does not tolerate operation in humid air.
I will answer you directly. Personally, I have repeatedly plastered the walls in the bathroom and toilet with Rotband gypsum plaster (for example, Knauf firm). It is very easy to apply, adheres perfectly to mineral surfaces, does not spray around the room and makes it very easy to align walls with strong vertical drops.
But I recommend using it only as a starting point. That is, to align and preliminary finishing surfaces. And after the starting Rotband plaster, decorative is applied - it is very easy to do the finishing with your own hands, since the surface will already be flat.
Although some professionals prefer to texture the Rotband after it is partially dry. Different ways they create different reliefs on finished surfaces. After painting, plaster can also be considered decorative. Although I do not see any particular advantages of this finishing method and I never resort to it.
Another point that interests novice masters. They ask if Rotband can be used as a starting finish for tiles (i.e., is gypsum plaster suitable for tiles). Yes, I personally met with this method of facing, but still I advise you to resort to more effective options, since in this case it is necessary to follow a certain technology for preparing the plastered surface.
Disadvantage gypsum plaster is its price. It is higher, especially when compared with conventional plaster mortars based on cement, but still lower than that of sanitizing compositions. So think about which to align the walls and which not.
Facade plaster
In some cases, when carrying out repairs in the bathrooms, I used textured waterproof plaster for the facades. It has many benefits:
- high strength - the decorative layer in the bathroom will not be damaged as a result of significant mechanical stress;
- durability - the service life of the material is quite sufficient for the finish to be preserved until the moment when you want to make a new renovation;
- moisture resistance - the plaster is specially designed for outdoor use, therefore exposure to steam, water droplets and high temperature in the bathroom will transfer without any problems.
When choosing facade plaster for use in the bathroom, give preference only to those options that you are 100% sure of environmental friendliness and safety. The fact is that some materials for facade decoration can, during operation, emit chemical compounds harmful to humans into the air.
Well, as for the cons, I would single out a too rough texture and not so much variety. Moreover, most often facade plaster does not have a smooth surface (like, for example, a Venetian one), so it is quite difficult to harmoniously fit such a finish into a bathroom design.
Decorative plaster
This finishing option, which was practically not used before due to the lack of necessary materials, is now becoming more and more popular. Moisture-resistant decorative plaster allows you to create beautiful textured surfaces of any shade. At the same time, the material is able to smooth out small irregularities and wall defects without preliminary preparation.
In addition, decorative plaster for sanitary facilities has the following advantages:
- High vapor permeability. After application to the walls and drying, the decorative composition does not stop the process of air infiltration through the walls. This promotes the natural removal of moisture from the bathroom and creates a comfortable microclimate inside.
- Antiseptic properties. Fungus, mold and microorganisms harmful to humans do not appear on the surface of the material.
I personally like decorative plaster because after its application (tested on my own experience), the mirrors do not fog up in the bathroom after taking a shower. The fact is that excess moisture vapor is absorbed into the decorative finish, and does not settle on smooth and cold surfaces.
To reduce consumption decorative plaster, I recommend applying it on pre-plastered starting plaster walls. You can use cement-based sanitizers or gypsum Rotband.
Naturally, I recommend the first option, and here's why:
- sanitizing plaster forms a waterproof layer;
- gives walls sulfite resistance;
- helps to quickly adsorb excess water vapor from the air in the bathroom;
- provide easier application of decorative material;
- keep the finish from cracking during operation.
Often I have used Venetian decorative plaster for decorating the walls in the bathroom, which, once cured, forms a smooth and attractive surface. In addition to its aesthetic function, the Venetian protects the walls from moisture by means of a wax layer on the surface.
Plaster of this variety is great for classic English interiors... It can cover not only walls, but also the ceiling of the room. The finish has a glossy sheen that blends perfectly with water for people. However, it is still not worth finishing the shower stall with it, since the material is not strong enough for this.
When working with Venetian, it is very important to qualitatively protect the joints with other surfaces using a moisture-resistant sealant. For example, the place of contact between a plastered wall and ceramic tiles... Or plaster and ceiling. If this is not done, moisture will gradually penetrate under the waterproof wax layer and the finish may deteriorate.
If for some reason you do not like Venetian plaster, you can use textured one. In this case, the decorative finish mixture can be applied in one of the ways listed above:
- Uniformly rough. It is necessary to apply the composition to previously prepared surfaces using a foam sponge, a broom or a newspaper sheet crumpled in a lump, protected from getting wet with a plastic bag. As a result of the impact of such tools, a relief is formed on the walls or ceiling, which outwardly resembles "goose bumps", that is, pimples.
- Furrowed rough. In this case, use special plaster"Bark beetle" and a regular grater, with which the finishing layer is smoothed. V finishing composition there are special solid elements that, when exposed to them with a float, form horizontally or vertically directed grooves on the surface (depending on how you worked with the float).
- Furrowed. Its essence lies in the formation of a special relief on the surface of the plaster. It is done using a template of the selected shape or an ordinary spatula. By pushing through the plaster according to a pre-selected scheme, you can simulate tiling, brickwork, and so on.
Well, in conclusion of the story about plasters for bathrooms, I will give you some tips, which, I think, will not be superfluous:
- Whatever they tell you, I do not recommend purchasing gypsum plaster compositions.... Yes, there are gypsum-based moisture resistant plasters on the market that can be used to decorate the walls in the bathroom.
But myself binding material already during operation, it can absorb too much liquid and collapse. Therefore, if you do plaster with plaster, then in the toilet, where the level of humidity is lower.
In the bathroom, put gypsum plaster away from the places where you will have a shower and a sink. And take care of very effective ventilation of the room (this will not be superfluous in any case).
- I advise you to plaster the walls in the bathroom with cement compounds... But make sure that there is no lime in the mixtures. It is known to increase the plasticity of the material, but very much reduces water repellency.
- Buy only waterproof renders. When choosing dry mortar in a store, make sure the packaging is labeled accordingly. And don't listen to recommendations from sellers who claim to bath will do any.
If you are going to lay tiles on the plaster, buy a material specifically designed for this. Although some manufacturers do not put appropriate markings on bags with dry mix.
- Don't skimp. No need to buy cheap plaster mixes for working in bathrooms and. As a rule, modifiers and plasticizers are not used in their production, and all the inscriptions on the bags are just an advertising campaign.
Better to prioritize products famous brand... For example, Knauf.
- Check the date of production of the dry mix. It is indicated on the bag. After that, you need to look at the shelf life in the instructions and make sure that it has not passed yet.
Never buy expired formulations, even if you are given them with a 90% discount. Plaster binder and modifiers lose their properties over time, so you won't get any benefits. - Buy plaster depending on what material the toilet walls are made of. For example, for brickwork material with filler from coarse sand, for wall blocks - from fine sand.
If you choose the wrong one, then it will be more difficult to work, and you will not get high-quality coverage.
Conclusion
Now you know exactly as much about plastering compounds for bathrooms as I and Aunt Sonya (and also all of Odessa, since I doubt that she did not share the information she received with everyone who was in her reach). And if you want to know a little more than a glorious Odessa woman, watch the video in this article, which describes how to plaster the walls.
Do you think you need a moisture-resistant plaster for the bathroom or can you get by with traditional compounds? Have you used decorative plaster for your sanitary facilities? I would be glad to see your stories, tips and questions in the comments to the material. None of them will be left unattended.
August 12, 2016If you want to express gratitude, add clarification or objection, ask the author something - add a comment or say thank you!
Wet room plaster requires the use of waterproof mixes.
Such compositions increase the degree of protection of the basement walls, basement rooms, bathrooms and pools.
Waterproof plaster is universal remedy that does not require certain skills in application and significant costs Money.
Moisture-resistant mixtures are used for outdoor, interior decoration premises.
Plaster can serve as a base for tiles, a screed when leveling walls, as well as as a decorative coating.
Suitable for substrates made of materials such as:
- Concrete;
- Foam concrete;
- Gypsum;
- Brick;
- A rock;
- Gas silicate.
The undoubted advantages of plaster are:
Waterproofness of the material provides reliable and long-term coverage in unheated rooms and rooms with high humidity.
High-quality adhesion makes it possible to apply the mixture on almost all surfaces.
Creation of an absolutely even layer, no shrinkage and cracking of the coating. No cracks form after drying. 
The mixture contains environmentally friendly components, which makes the material absolutely harmless to human health and external environment.
Due to the presence of plasticizers in the composition, the solution is easily applied to the base.
Kinds
Plasters for rooms with high humidity are divided into several types: gypsum, cement and polymer.
The gypsum mix contains a variety of natural mineral and modified components that provide excellent performance.
When applied to the base, the composition is laid down in an even layer, leveling is carried out using a level, providing a smooth surface that does not require additional processing. 
After prolonged exposure to moisture on the plastered walls, when completely dry, they remain fully usable, having a sufficient margin of safety.
Cement plaster for wet rooms is characterized by strength, durability and resistance to high humidity.
The main component is cement grade M 150 or M 200, additional components - river sand and lime.
Due to the properties of cement, mixtures based on it are resistant to temperature extremes and constant exposure to moisture. 
Polymeric plasters are characterized by a high degree of water resistance, plasticity, strength and durability. Such mixtures are made on the basis of acrylic, epoxy resins and polyurethane.
Polymer compositions are not used for capital equalization surfaces, they are applied thin layer on a pre-prepared base and are used for decorative cladding.
How to prepare plaster yourself
To prepare moisture resistant mixture do it yourself at home you will need special hardeners that increase moisture resistance.
They are added to the sand-cement composition in a 1: 1 ratio. Alternatively, lime can be used as a hardener.
The mixture should be thoroughly mixed, avoiding the formation of lumps - this affects the quality of the plastering.
Please watch the video:
An insufficiently mixed solution will lead to cracking of the coating, as a result of which the protection against moisture penetration will be compromised.
Application technology
The plastering process is carried out in several stages:
Preparing the walls. Includes cleaning the base from dust, dirt and various layers. The old coating must be removed. 
Making shallow cuts. It is advisable to make notches in the form of a Christmas tree, this will ensure high-quality adhesion mixtures with a base.
For these purposes, you can use a chisel, sandblasting machine, or any suitable improvised inventory.
Application of a starter layer. The solution (pasty consistency) is applied to the substrate using the point-to-point method.
The thickness of the plaster layer for wet rooms should not exceed 0.5 cm. Please note that there is no need to level the plaster, it should have an uneven surface.
Treatment . Wall processing is carried out after they have completely dried. 
If the coating is well done and the primer is evenly distributed over the substrate, one layer is sufficient, otherwise it is advisable to apply an additional primer layer after the previous one has dried.
Execution of the finishing layer. To do this, the primer layer should be moistened with water, then using a wide spatula, on which the solution is evenly applied, apply to the base.
The tool must be firmly pressed against the wall surface at an angle of 20 degrees.
Grout. It is customary to perform it in a couple of hours after applying the "covering" layer, without waiting for it to set. 
If you hurry and start sanding the walls too early, the plaster layer can peel off from the base in a layer.
If it is too late, the composition will partially solidify and it will be almost impossible to achieve an even distribution.
Grinding the plastered surface. Sanding must be carried out if painting or wallpapering is planned. 
After the composition is completely dry, using sandpaper, the surface of the walls is carefully sanded to a perfectly even and smooth state.
If the instructions do not require the use of primer mixtures, then plastering can be performed without subsequent priming.
Such compositions have a high degree of adhesion to the base due to the content of special components.
After stirring the polymer mixture, experts recommend leaving it for a quarter of an hour, then stir it again and use it as directed.
Watching the video
* information posted for informational purposes, to thank us, share the link to the page with your friends. You can send material of interest to our readers. We will be happy to answer all your questions and suggestions, as well as hear criticism and wishes at [email protected]Moisture-resistant plaster is finishing material, which is used in rooms with high humidity. It can serve as a base for tiles, screed, leveling the wall, and also used as a decorative coating. Immediately, we note, as a supplement to the material and a site where you can buy excellent tiles - http://keramatika.ru/.
Types of moisture resistant plaster
Moisture-resistant plaster can be bought pre-packaged as a ready-made mixture or made by yourself. Most often, such mixtures contain cement, gypsum, polymer additives, sand, and acrylic. It is better to buy ready-made mixtures, since all proportions have already been observed there. They independently prepare moisture-resistant plaster from cement, sand, lime. By type, moisture-resistant plasters can be divided into gypsum, cement, polymer.
Manufacturers offer very wide range of moisture resistant plasters that are applied in different ways to the surface. The surface is mainly concrete, brick walls, which are additionally treated with a primer or water-repellent coating composition.
There are also decorative moisture-resistant plasters that perform two functions at once - they decorate and protect from moisture. With their help, the walls are also aligned. It is advisable not to use decorative plasters in bathrooms with uneven surface, for example, bark beetle. Fungus and mold grows in them. Sometimes a special wax coating is used to prevent the decorative plaster from getting wet. Polymer-based elastic formulations are also interesting in terms of creating various decorative effects.
Where is moisture resistant plaster used?
Moisture resistant plaster is used in bathrooms, basements, garages, terraces, balconies. It is necessary to read the instructions on the packaging, which indicates whether the plaster can withstand moisture, weather and low temperatures... There are moisture-resistant plasters for facades that have all these characteristics. Moisture-resistant plaster can be applied to both horizontal and vertical surfaces, sometimes it is used as a base for a screed.
When choosing plasters, you should pay attention to the thickness to which it can be applied and the material consumption for square meter... On average, with an application thickness of 1 centimeter, 10-20 kilograms of plaster are consumed per 1 square meter of area.
How to apply moisture resistant plaster
Moisture resistant plaster is applied in the same way as usual; the surface must be thoroughly cleaned of old coating, dust and debris. If the wall has been painted old paint you need to remove, the same goes for ceramic tiles, or any other coating. The paint is removed with special solvents, and the tiles are mainly removed with a perforator.
At the next stage, the walls are treated with a primer or waterproofing compound. Waterproof plaster is applied over the beacons, which are then removed. Work on the application of moisture-resistant plaster is carried out only at positive temperatures. After about 4-6 hours, grout is carried out.
Despite the fact that our civilization is moving forward and constantly evolving, creating more and more new technologies, nevertheless it does not forget about old materials, constantly improving them and bringing them to the ideal. This good technology, which many modern craftsmen undeservedly forget for one simple reason - new materials and technologies are easier to use. This, of course, is good, but with their simplicity, they also received disadvantages that affect the durability of the repair. For example, drywall - unlike it, high-quality plaster is able to serve and protect walls from destruction for much longer. Moreover, it can do all this effectively with equal success both indoors and outdoors, both in dry operating conditions and in a humid environment. We will talk about this material in this article, in which, together with the site, we will deal with the question of what is plaster for wet rooms and what are its features?
Plaster for rooms with high humidity photo
Wet room plaster: what is it
Plaster for rooms with high humidity differs from standard version only by its ability to repel moisture. Such characteristics of the material are achieved by introducing special modifiers into its composition, which give the material the necessary qualities. The result of the use of additives is the high technical characteristics of moisture-resistant plaster.
And this is with regard to the main features of the material. Among other things, waterproof plaster is very easy to apply without the use of special technical means- everything is done the old fashioned way by using a spatula and a rule. And that's not all - almost all materials of this type can be additionally modified by introducing additives into them. For example, in order to speed up the hardening process of the mixture, gypsum can be freely added to such a plaster - in general, in this respect it is quite a standard material that modern builders use extremely rarely for the reason indicated above.
Varieties of plasters for wet walls
Today, two main types of plaster mixes are used to decorate rooms with high humidity.
What else you need to know about the types of moisture-resistant plasters is that they are classified according to other criteria.
- Appointment. In this regard, all currently existing compositions, including gypsum and cement, are divided into two large groups- leveling and decorative plasters. What is the difference, it will not take long to explain - leveling plasters can be applied in a very thick layer, but are intended for the device of thin-layer coatings.
- The degree of readiness for work. Here, in general, everything is simple - when planning repairs using plaster, you need to know that any composition (both decorative and leveling) can be purchased with equal success both ready-made and prepared independently.
Modern construction stores abound in various, including plasters for wet rooms. Buying them is the easiest solution. But if you really want to save money on repairs without losing its quality, then it is better to use the second option. We will tell you further how to create a water-repellent plaster with your own hands.
Self-production of wet plaster: options
Plastering the walls of wet rooms can be done not only with the help of special compounds - water-repellent properties can also be given to the already finished plastered surface, which is the easiest way. The fact is that self-preparation of a dry mixture with the desired characteristics will require from you not only knowledge of proportions, but also equipment capable of observing all these proportions. In general, the matter is complex, even when it comes to additives added to a wet solution. The easiest way is to use other options that are no worse than those offered in stores.
In general, moisture resistant is a very specialized material and in apartment renovation it is practically not used. The only exceptions are decorative mixtures used in bathrooms instead of the usual tile... As a rule, they are made on the basis of acrylic and successfully resist moisture even if it hits the walls directly.
To conclude the topic of what plaster for wet rooms is, I will say a few words about the difference between moisture-resistant and water-repellent plaster. These are two different things. The first option is able to withstand short-term exposure to high humidity (wetting followed by drying), and the second is designed for operation in a wet environment, that is, when the plaster is constantly exposed to moisture - for example, in the pool bowl, under the tiles. In fact, this is a full-fledged waterproofing.
This article will discuss the possibility of using different types plasters for finishing bathroom surfaces and other wet rooms. Our main task is to find an adequate option for use in difficult conditions.
Leveling and decorating the base
Despite the innovations in the construction industry, not all apartment owners in new buildings can boast of smooth walls. And when their curvature is especially bad for the eyes in the bathroom, it is worth sacrificing a few square centimeters of area to give the room a decent look. This can be done using, mounted on a frame or planted on glue. And it is better to go along the path of plastering the surface - this way you can more effectively use the already small area of the bathroom.
In general, the use of plaster for wet rooms can solve two global problems:
- preparation of the foundation for subsequent finishing works... This can be cladding with tiles or some other piece materials, painting, applying decorative plaster, etc.;
- giving the base a finished look with the help of thin-layer decorative compositions... And if in the first case the choice is small, then in terms of design, the number of options is practically incalculable. But more on that later.
Alignment of walls (or ceilings) is carried out using solutions based on binders such as cement or gypsum. Usually, preference is given to ready-made dry mixtures with verified proportions of the components, but this does not prevent you from kneading the solution yourself. We will talk about the expediency of use below, but for now we suggest that you familiarize yourself with the approximate prices for dry mixes.
| Name | Type and main purpose | Consumption with a layer thickness of 10 mm, kg / m 2 | Approximate price* |
|---|---|---|---|
| Waterproofing plaster EU | Cement composition for application on stone substrates (horizontal and vertical) in order to level them and protect them from moisture | 17-22 | RUB 290 for 25 kg. |
| AZOLIT-VSH | Waterproof, cement-based plaster for application on brick and concrete walls | 13 | RUB 500 for 25 kg. |
| Murexin Waterproofing Hydro Basic 1K | Cement-based waterproofing for finishing non-deformable substrates (vertical or horizontal). Can be used for waterproofing water tanks, balconies, terraces, various wet rooms | 15 | RUB 490 for 25 kg. |
| MAGMA GidroPlaster | Dry mix on a cement basis for finishing any surfaces in order to protect them from moisture | 17 | RUB 300 for 25 kg. |
| Profit Barrier | The composition refers to cement-polymer mixtures, coating-type waterproofing, which is used to protect the bases from moisture under the screed or tile cladding | 15 | RUB 380 for 25 kg. |
| Profit Hydrophobe | Cement-sand plaster for application on stone or previously plastered surfaces | 15-16 | RUB 200 for 25 kg. |
| Ceresit CR 65 | Cement mixture for all types of stone substrates | 8-10 | RUB 800 for 25 kg. |
| weber.vetonit TT | Cement-based with a maximum layer thickness of 10 mm | 12 | 330 RUB for 25 kg. |
| Consolit 540 Waterproofing plaster | Multi-component, cement-based dry mortar for leveling walls and ceilings in wet areas | 15-16 | 240 RUB for 25 kg. |
| UNIS SILIN Cement Plaster | For leveling surfaces in damp rooms | 12-16 | RUB 250 for 25 kg. |
| UNIS Teplon Moisture-resistant plaster | Plaster composition for leveling substrates in rooms with normal and high humidity | 6 | 330 RUB for 25 kg. |
| Dufa Kratzputz aussen | Ready-to-use acrylic decorative plaster for creating a moisture-resistant coating ("orange peel" texture) | 1.8-2 (depending on application technique and thickness) grain size 1.5 mm | RUB 1800 for 20 kg. |
| STUC DECO, STUC GRANITO Waterproof plaster |
Elastic composition based on a polymer binder. Allows you to create a waterproof coating with a variety of decorative effects | About 0.5 kg depending on the application technique | RUB 10600 for 16 kg. |
(*) Given the incomprehensible situation with the course Russian ruble and the abrupt change in prices for dry mixes, the table shows the approximate cost solely for comparing formulations on the basis of "more expensive or less expensive".
We did not give as examples the entire assortment range of plasters and. You can get acquainted with them in separate articles. The same goes for decorative plasters. Basically, you can use any Venetian plaster... Just do not forget to use as a finishing layer protective compound... For example, Optimist plaster wax. At a price of 500-800 rubles. per kg, the packaging is enough for surface treatment of 10-15 sq. m.
Which solution to use for leveling
This question is ambiguous - it all depends on the specific situation. For example, gypsum coatings are very afraid of operating conditions with high humidity. The direct impact of water is like death for them. The decision is to isolate the aligned plane from the external environment. This can be done using a coating-type waterproofing compound. It would seem that the problem has been resolved. But even in this situation there is a risk. Suppose that you have plastered the walls and ceiling of the lighthouses, protected them from humid air using waterproof solutions, glued the tiles. And after a while, the neighbors from above accidentally forgot to turn on the tap or knocked over a bucket of water on the floor, which will surely have time to seep out to you. In this case, moisture will come into contact with the plaster from the unprotected side. This will cause it to swell and reduce adhesion. In the worst state of affairs, tiles can fall off the walls.
But there are mixtures that are labeled as "moisture resistant plaster". They are also gypsum, but due to their composition they make it possible to obtain a surface that is not afraid of exposure to humid air.
The video below discusses situations when gypsum plaster can be used, and when it is better to use for bathroom decoration cement compositions... Well, in general, it is shown to what state it is better to modify the base for the subsequent gluing of the tiles.
Why do so many finishers use gypsum plaster when leveling bathroom walls? Everything is explained by the fact that this composition is the easiest to work with. In fact, "for themselves" these people work with cement mortar - it is safer this way.
And for good reason: it is the cement mortar that is considered the most a good decision For bathroom. It has good adhesion to stone substrates, water resistance, durability. Below is a video on how to exercise plastering work In bathroom. It is about leveling the base for subsequent gluing of the tiles. The video demonstrates an approach to the installation of beacons and the use of an adhesive layer for better adhesion of cement-based plaster.
In most cases, you can do with the usual dry plaster mix M150. It is produced by many manufacturers and is quite capable of handling the task of leveling the base in the bathroom and other wet areas. Advantages: low cost, availability, usability and high quality finished surface. Flaws: high consumption(per 1 sq. m. 18-20 kg with a layer thickness of 10 mm), it is necessary to withstand a significant pause to achieve the desired properties of the coating.
Often lighthouses are fastened with gypsum plaster, using to form a leveling layer cement plaster... After it has set, it is imperative to remove the beacons and clean the wall from traces of gypsum mortar.
If this is your first time laying tiles, but you are dealing with an uneven base, do not rely on the possibility of adjusting the plane at the expense of adhesive solution... Better work on the wall with plaster. Ideally flat wall much easier to veneer!
You can experiment with a solution, the components for which are cement and liquid glass... It sets quickly and gains strength just as rapidly, but allows you to get a really high-quality waterproof coating.
Regardless of the degree of water resistance of the finished plastered surface, it should be additionally treated with a primer deep penetration or suitable waterproofing compounds, for example, the same Aquastop, etc.
We must not forget that high humidity carries in itself not only the threat of destruction of the finish, but also the development of microorganisms, mold, etc. Therefore, it will not be superfluous to apply a fungicidal primer, both on an unplastered base, and after leveling the walls with a solution.
From the rubric "This is not worth doing." When plastering an old bathroom, it is imperative to remove a layer of paint - completely, otherwise the plaster will "flop" and fall off along with the tiles glued to it. If you knead cement-sand mixture yourself, do not spare the cement. Due to its lack, the coating may turn out to be too fragile.
Decorative plaster in the bathroom
Any ready-made solution can be used. An important role is played by the application of a protective layer, which will serve as a barrier to humid air. And despite the fact that in our minds the installation "There is only tiles in the bathroom!" more people discover endless possibilities decorative plaster.
A video for those who doubt the advisability of decorating such premises as a shower or a bathroom. In fact, today there are compositions that, in terms of their waterproof properties, are almost as good as tiles. And if you take into account the integrity of the canvas and the opening design possibilities then accept final decision the choice of material becomes not so easy.
This might be helpful
Returning to the topic of mold development. It is worth choosing textures with the least pronounced relief. For example, it is in no way suitable for finishing a bathroom, because the decorative effect implies the presence of many furrows in the coating, in which mold will surely start.
Surfaces to be subsequently exposed direct impact water, it is best tiled. The symbiosis of tiles and decorative plaster looks quite organic.
Finally
Within the framework of this article, we have tried to highlight the range of possibilities in the decoration of bathrooms and other wet rooms that open up to the plaster. Hopefully now you do right choice material and give your apartment the desired look.