Facade plaster for aerated concrete

Because of its superior thermal insulation and lightweight nature, aerated concrete is a widely used building material. However, the exterior of aerated concrete walls frequently needs an extra layer of protection to achieve a long-lasting and visually appealing finish. Facade plaster can help in this situation.

In addition to adding to the aesthetic appeal of aerated concrete structures, facade plaster acts as an essential weatherproof layer. It aids in preventing moisture intrusion, which can shorten a building’s lifespan and cause structural damage. Your aerated concrete walls’ performance and longevity can be greatly impacted by the type of facade plaster you choose.

Breathability, adhesion, and durability are important considerations when choosing facade plaster for aerated concrete. Breathable plasters let moisture escape the wall, which stops the growth of mold and mildew. Strong plaster attachment to the aerated concrete surface is ensured by good adhesion, even in inclement weather. The plaster’s durability guarantees that it will hold up over time, offering both long-term protection and visual appeal.

This post will discuss the various kinds of facade plasters that work well with aerated concrete, their advantages, and the best ways to apply them. Knowing your options for facade plaster can help you make an informed decision and guarantee the longevity and aesthetic appeal of your aerated concrete building, regardless of whether you are building from scratch or renovating an existing structure.

Plaster requirements

Due to its open-pore cellular structure, aerated concrete offers excellent vapor permeability in addition to thermal insulation qualities. This feature prevents condensate buildup, minimizes the chance of mold growth, and creates the ideal microclimate inside the home.

Aerated concrete walls

Aerated Concrete House

On the other hand, there is a negative aspect as well: the material becomes more hygroscopic due to open pores, and the water absorbed during freezing kills the cells. Because of this, the exterior finish needs to be waterproof to ensure that the walls are consistently shielded from moisture and have a steamability that is equal to or greater than aerated concrete to allow for the release of fumes.

Crucial! The standards outlined in SP 50.13330.2012 state that in heated houses, materials’ vapor permeability should rise from the interior to the exterior layers. It is only in these circumstances that supporting structures can operate normally. The plaster composition needs to be chosen with vapor permeability of at least 0.12 mg/(m · h · PA), since this parameter varies in aerated concrete within the range of 0.11-0.23 mg/(m · h · PA).

Façade plaster should also possess the following characteristics:

• high adhesion to the material of the base;
• frost resistance (at least 35 cycles);
• increased compression strength;
• resistance to atmospheric influence;
• decorativeness.

Aerated concrete surfaces can theoretically be used without a protective layer, but after a few years, the external appeal will fade due to block discoloration, detachment, and possibly mold growth. Therefore, it is preferable to finish a facade right away and only paint it on a regular basis to update the coating.

Plaster staining updates

Prices for aluminum stairs

The staircase is aluminum

For aerated concrete, facade plaster is a crucial finishing layer that provides both aesthetic appeal and protection. By protecting the porous surface from moisture, it improves insulation and durability. Facade plaster also offers a beautiful, smooth finish that can be tailored to fit any architectural style. Homeowners can achieve the desired exterior appearance for their house while also greatly extending the life of their aerated concrete walls by selecting the appropriate type of plaster.

Types of plasters for aerated concrete

Cement-sand plaster is the most widely used and least expensive type for exterior work. Its vapor permeability of only 0.09 mg/(m · h · PA) means, however, that it is completely inappropriate for use in aerated concrete structures. The necessary parameters are present in other types of plastering mixtures, including mineral, silicate, and silicone. Give each of them a closer look at their attributes.

Mineral

Mineral-based plaster is made with low-cost materials and is simple to apply with your hands. The primary drawback is the limited color palette; however, given how well this coating stains, this isn’t really a huge issue. The final mixtures include marble chips, white sequence, lime, and other fillers along with some additives that enhance plaster quality. The most common ingredients in homemade mixtures are sand, lime dough, and cement, or just sand and lime. It is important to remember that precipitation directly affects sand and core solutions, which have low water resistance.

The wall covered in lime plaster

Medium-grained, high-strength mineral coating over a lime foundation

Crete 35 decorative plaster

Silicate

Glass with liquid potassium serves as the binder in silicate plaster. These compositions are more easily applied, do not react negatively to moisture, and evaporation is handled flawlessly, making them suitable for use as a finish coating for ornamenting aerated concrete walls.

Picture of silicate plaster

You will have at least 25 years to enjoy the silicate plaster decoration on the facade wall.

The color scheme is fairly restricted, but staining again makes this flaw easily disappear. When it comes to price, silicate plaster is slightly more expensive than dry mineral mixtures when it is sold in ready-to-use form.

Silicone

The basis of silicone plaster is silicon-organic polymers. It has the best characteristics compared to other types of plasters: does not absorb water, is easily applied, resistant to atmospheric effects, vapor permeable and does not lose its external attractiveness for a very long time. In addition, such a coating remains elastic, and when shrinkage of aerated concrete blocks is not covered with cracks. Silicone plasters are also sold ready for use, have many color options. Due to the presence of special fillers, silicone plasters make it possible to create a variety of coating texture. The only negative is the high price of the material, so not everyone can afford such a finish.

Silicone plaster comes in various fractions.

Texture of bark beetles from silicone plaster

Acrylic

However, the application of acrylic plasters for aerated concrete is restricted to situations where the interior walls’ hydraulic protection is improved and the building’s ventilation is of the highest caliber. This is because the material has a low steam capacity and a composition more akin to cement and sand. Insufficient protection of the interior surfaces will allow water vapors to build up in the wall’s thickness, which will cause the finishing layer to separate.

Decorated with acrylic plaster

Popular types of plaster mixtures for aerated concrete blocks

Outfit the T-21 Starter with

Color scheme for Ceresit CT 77

Prices for various types of decorative plaster

The plaster is decorative

For aerated concrete, selecting the appropriate facade plaster is essential to the exterior beauty and longevity of your house. The proper plaster can boost insulation, prevent weather damage to your aerated concrete, and improve the overall look of your home. When choosing, it’s critical to take things like breathability, flexibility, and moisture resistance into account.

There are several kinds of facade plaster available, and each has advantages of its own. Mineral plasters are a great option for aerated concrete because they are breathable and long-lasting. While silicone plasters combine the advantages of both mineral and acrylic options, offering durability, flexibility, and ease of maintenance, acrylic plasters are more flexible and come in a wider variety of colors.

Selecting the appropriate plaster type is not as crucial as its proper application. To get the best results, make sure the surface is properly cleaned and prepared. Plaster longevity can be increased and adhesion strengthened by applying a primer. Always adhere to the manufacturer’s instructions, and if you’re not sure you can do it yourself, think about hiring an expert.

In conclusion, the performance and appearance of your aerated concrete facade can be greatly impacted by the choice and application of facade plaster. You can safeguard your property and take pleasure in a stunning, long-lasting finish by taking the time to select the right type and making sure it is applied correctly. Whether you favor the classic appearance of mineral plaster or the adaptability of silicone or acrylic alternatives, there is a solution that will satisfy your requirements and improve the external appearance of your house.

Video on the topic

Economical external decoration of aerated concrete. Not only about plaster

Spadar and other plasters. Again about the decoration of aerated concrete

Ready facade of a house from aerated concrete for 50 rubles/m²

Simple decoration of aerated concrete, external plaster, composition, features of application.

1st times plastered house with warm facade plaster

The technology of decoration of the facade from aerated concrete without insulation. Decorative plaster Cerezite ST174

Warm plaster for the facade of aerated concrete and not only | Spadar | How to warm a house from aerated concrete?