Moisture -resistant plaster – reliable protection of walls from the destructive effects of moisture

Moisture can cause significant damage to walls over time, necessitating expensive repairs. Moisture-resistant plaster is a practical defense against this since it offers a robust barrier against water infiltration.

This kind of plaster is perfect for use in places like kitchens, basements, and bathrooms because it is made specifically to withstand high humidity levels. It helps keep walls structurally sound and protects them from moisture, which helps avoid problems like mold and mildew.

You can make sure that your walls stay strong and long-lasting even in difficult situations where moisture is a constant threat by using moisture-resistant plaster.

Feature	Description
Durability	Moisture-resistant plaster offers long-lasting protection against water damage, keeping walls strong and intact over time.
Application	It"s suitable for both indoor and outdoor use, making it versatile for various wall surfaces.
Benefits	Prevents mold and mildew growth, ensuring a healthier living environment.
Maintenance	Requires minimal upkeep, saving time and effort in the long run.

Waterproof plaster what is it

Water enters the building and, along with precipitation or capillary ledge from the ground, thoroughly erodes the brickwork as well as the concrete, wood, and metal components. Moisture that is devoid of any extraneous materials is a solvent that is removing the binding agents from concrete.

After leaving the city’s contaminated atmosphere, precipitation and soil waters contain salts and are acidic environments. The liquid releases salts upon contact with brick, causing efflorescence to rise to the surface. Microorganisms quickly degrade wet wood.

Because of its density or the surface’s water-repellent qualities, moisture-resistant plaster forms a waterproof barrier that reliably stops the flow of water and protects building structures. In the latter instance, water cannot flow in the opposite direction because the plaster covering permits air and moisture that evaporates through the walls’ pores to pass through.

Different bases for moisture-resistant plaster solutions result in coatings with various characteristics.

Classification of water-resistant plasters

The primary classification of plaster composition types is based on their intended use:

• leveling;
• decorative plaster.

The first is used to provide a sturdy, level surface for finishing (tiles, wallpaper, paint) and to create a dependable protective coating for walls, basements, and ceilings. Here, strength, water resistance, increased material adhesion, and vapor permeability are crucial.

Mixtures for sanification have shown to be reliable and waterproof. They serve as a substrate for finishing coats.

Plaster of the second variety is used for finishing. Their primary attributes are thus their placement simplicity, flexibility, and capacity to produce an impressive surface. Environmental friendliness, strength, and vapor permeability are also crucial. Venetian plaster is particularly ornamental when it is covered in a layer of protective wax.

Additionally, mixtures of water-resistant plaster compositions are separated out:

• for wet rooms;
• universal purpose;
• for outdoor use.

Blends meant for external surfaces can tolerate a temperature range of -50 to +65 °C, in addition to the harsh impacts of acid rain, hail, impact, and abrasive surfaces.

Based on base type, they are:

• mineral (as a binder – cement, gypsum);
• acrylic;
• silicate;
• silicone.

Advantages and disadvantages of the material

When we contrast different types of plastering materials with those that prevent water from penetrating building structures, we can observe that:

• Their scope of application is wider. After all, in rooms where a high level of dampness occurs and is maintained, not every plaster coating can last a long time without giving up its protective position. There are many places with high humidity in houses.
• Possessing water-resistant properties, moisture-resistant plaster is vapor-permeable.
• Have low shrinkage, without cracking during hardening and gaining strength.
• Form a strong bond with almost all types of base materials.
• The plasticity of the solution is beyond praise. It makes the work of plasterers easier.
• Environmental friendliness, thanks to which the compositions can be used in children"s institutions.

Recommendations for choosing compositions

When it comes to making decisions, they are influenced by the following factors:

• scope and purpose (for indoor plaster or for external work, finishing or leveling);
• base material (select a mixture on an appropriate basis);
• possible decorative effect (Venetian, fur coat, etc.).);
• application method (mechanized, manual);
• financial capabilities.

Thus, before continuing with the tiling, a plaster base that can bear the weight of the tiles must be installed. In this case, cement-polymer or cement mixtures function well.

Paint mixtures designed for wet rooms, like Knauf or Zeresit, are appropriate if you intend to apply a coating.

Coarse sand mixtures work better for brick walls, while fine filler and waterproof composition work better for wall blocks.

Sanitizing compounds should be used on brick and concrete walls in rooms with damp air and where moisture may enter the walls through capillary suction or flooding from above. These coatings, like Kema San550, are elastic and don’t break when the structure shrinks or operates. Only one week after application can ornamental mixtures be applied on top of rehabilitating rough plasters because they take a little longer to dry. They are employed even in situations where they come into direct contact with liquids.

The finishing effect influences a wide range of decorative composition choices. Plaster mixtures with names like "bark beetle," "travertine," "lamb," and "fur coat" are available.

For walls to be shielded from moisture damage, long-lasting durability, and the preservation of building structural integrity, moisture-resistant plaster is a must. This specialty plaster is a dependable option for protecting interior and external walls in moist environments because it functions as a barrier against water infiltration, preventing problems like mold, mildew, and decay.

Cement mixtures

The principal ingredients of cement plaster that resists moisture are cement (binder) and sand (filler). The composition also contains plasticizers, pigments, dyes, and hydrophobic and other functional additives. These compositions have great strength after drying and excellent water resistance just one day after application. Dry mixes can be bought pre-made (a balanced, moisture-resistant mixture is diluted with water before use), or the mortar made of cement can be diluted on its own. Applying mixtures can be done mechanically or manually.

You can select ready-made dry mixes that are appropriate for:

• any base – Ceresit CR65, Murexin Waterproofing Hydro Basic 1K;
• application on brickwork or concrete – Azolit;
• plastering brick and stone – g/i mixture EC;
• application of a waterproofing coating on plastered surfaces – Profit Gidrofob.

Before using, cement SS is quickly diluted in an appropriate container. To mix with water, use a mixer. To ensure that the ratios of the components in the solution are maintained, use the full volume of SS when mixing. If required, color the plaster, keeping in mind that color fades as the coating dries.

Ceresit can be added in the form of milk or liquid glass to create a 1:1–1:3 waterproof solution that you can create by hand.

Gypsum compositions

Basements and damp rooms are not finished with standard gypsum compositions. Gypsum loses its qualities because of how easily its pores take in moisture from the air. But as builders and manufacturers assert, you can cover walls and ceilings in the bathroom with confidence thanks to moisture-resistant gypsum plaster.

The general rule that states that stronger plaster cannot be applied to a weak base also dictates the use of plaster gypsum mixtures. However, gypsum material is used in the bathrooms of many contemporary new buildings. The gypsum base is actually moldable and forms well. Thin patterned reliefs can be created.

Teplon Unis and Knauf Rotband are two popular pre-made SS options. Ordinary gypsum can be made water resistant by adding glue or PVA to the solution, or by impregnating the coating with primers that repel water.

However, not everything about gypsum mixtures is as it seems. The capacity of gypsum to actively absorb moisture is not entirely eliminated by even specially designed additives. It’s possible that trustworthy waterproof gypsum mixes will surface soon. You must handle them carefully in the interim. Compared to bathrooms, toilets have lower humidity levels. There, gypsum mixture can be applied. Waterproofing should only be applied to the portions of the wall or ceiling that could come into direct contact with water.

Compositions with polymer additives

Water resistance is also exhibited by compositions having a cement or acrylic base with polymer additives. They are both robust and adaptable.

Among the well-known ones are:

• decorative CC Stucgranito (based on microcement), Stucdeco;
• water-repellent Dufa Kratzputz (acrylic base);
• under tile cladding – Profit barrier

Apart from "pure cement," there are cements that have lime added to them, like Vetonit, Consolit, and Bundex Gidrosloy, which are used to level facades and room walls and ceilings. Polymer additives not only make polymers stronger, but they also make them more resilient to different kinds of impacts. They can even be supported by a thick coat of paint or tiles.

The following cement compositions with polymer additives are well-liked:

Required tool

In order to finish and level the wall surface, you will need the following standard plastering tools and accessories:

• trowel;
• grater;
• spatula;
• rule;
• trowel;
• brushes;
• rollers;
• mixer, masking tape;
• containers;
• level;
• plumb line;
• installation of beacons.

Application technology

The application technology for decorative and leveling moisture-resistant plaster will be discussed separately due to their distinct manufacturing processes. Nonetheless, whether moisture-resistant plaster is used for external work or the base is prepared for plastering premises, base preparation is a general step that is done in an identical manner.

The following are the steps involved in base preparation:

1. Old unusable finishing materials are removed from the walls. If the plaster coating on the wall is still strong and holds firmly, it is left. Only tapped, checking whether the plaster is holding well everywhere on the wall. If the sound when tapping is muffled, then the coating layer has come off. It is removed in this place.
2. New (and old) brick walls are prepared for plastering, deepening the grooves of the masonry joints by about 0.5 – 1 cm.
3. The wall is vacuumed or dust is removed in another way (with a brush, damp cloth).
4. Oil and grease stains are degreased, areas favored by mold and mildew are treated with a biocidal composition, metal parts are covered with an insulating composition, unnecessary ones, for example, nails, are removed. The wall is cleaned of efflorescence.
5. Pips and cracks are repaired with CPR (cement-sand solution). The protrusions are ground off.
6. To improve adhesion, small notches are made on the old plaster with a chisel. On the concrete surface, notches are made with a chisel or hatchet. Wooden walls are shingled or a mesh is attached to them.
7. The base is covered with 1-2 (the second is more reliable) layers of primer compatible with the base and type of plaster.
8. After the primer has dried, the wall is either leveled with putty (for finishing) or leveled with moisture-resistant cement-reinforced concrete.

Beacons are installed so that a plumb line can be used to level the wall. The facade, wall, and ceiling of the room are plastered after the solution has been prepared.

Alignment of walls

All that’s needed is a basic cement mortar. Three passes are made while plastering. Here, three layers are carried out:

1. Splashing (the solution is thrown on with a trowel or ladle). Some plasterers do this with a spatula. The solution contains slightly more moisture than usual. It is necessary to ensure a strong, reliable adhesion of the coating to the wall. After throwing, the layer is leveled a little, without bringing it to a smooth surface. The layer thickness for wooden walls is no more than 1 cm, for brick or concrete – 5 mm. The layer is dried for 24 hours.
2. Primer. A solution of normal density. Applied with a spatula or trowel. Aligned with a rule along the beacons. After the layer has set, remove the beacons, fill the remaining grooves with primer. This is the main layer. Its thickness can be more than 30 mm. In this case, there can be several layers (with drying of each).
3. Top coat. A solution of sour cream consistency, more liquid than the primer. A thin layer of top coat is needed to obtain a smooth coating under wallpaper or painting. Applied with a trowel, spatula on the coating formed by the primer (dried and slightly moistened before applying the top coat). Smooth the layer with a trowel or spatula before it dries. If it is planned to apply a decorative plaster coating on top of it (or use tile cladding), then it is not necessary to smooth it smoothly in order to ensure adhesion of the decorative and leveling plasters.

Application of decorative coating

The techniques used to apply decorative plaster vary depending on the desired outcome. Using the proper technique, the decorative solution is applied to the base in one or more passes using a spatula, trowel, or roller. At least a day is spent drying each layer.

Waterproofing of the applied plaster

Ordinary plaster, concrete, and other surfaces found in bathrooms, swimming pools, and fountains can all be waterproofed with waterproof plaster. It is used in the same manner as traditional fixes. Variations in both composition and characteristics.

Waterproofing types (g/i):

• cement-sand (rigid type g / i, after application it is necessary to moisten it within 15 days so that shrinkage cracks do not appear);
• cement with the addition of latex (its properties resemble liquid rubber), the hot mass is applied by gunning;
• cement with liquid glass.

Plastered walls are cleaned, and the rough layer is removed using sandpaper processing. It is necessary for the base to be dry. applied mechanically (spray) or manually (spatula), closely adhering to the guidelines provided in the instructions.

Finishing

For finishing, moisture-resistant compounds are also utilized. The material’s plasticity allows for the creation of a smooth, uniform coating.

The final touches could be as follows:

• glued tiles;
• painting with waterproof paints;
• additional plaster layer made of textured decorative waterproof plaster.

The varnish-coated Venetian plaster, whose composition is impervious to water, looks fantastic in the bathroom. Although the plaster coating can be embossed, microfauna and microflora prefer it because it gets dirty easily.

The same wall or ceiling coating techniques that are used for regular decorative mixture application are also used for textured decorative mixture application.

Selecting plaster that is resistant to moisture damage is a wise choice for anyone trying to keep moisture from destroying their walls. This kind of plaster maintains the structural integrity of your walls by acting as a barrier to keep moisture out.

You can prolong the life of your walls and avoid common problems like mold growth, cracking, and deterioration by using moisture-resistant plaster. It’s a sensible option that blends dependability and comfort, particularly in locations that are exposed to moisture or high humidity.

Purchasing this dependable wall protection increases the value of your property in addition to extending the life of your surfaces. Plaster that is resistant to moisture will make sure that your walls are sturdy, secure, and attractive for many years to come.

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