We cover mineral wool with plaster using the “wet facade” technology

Because of its superior thermal and acoustic qualities, mineral wool is a popular choice for home insulation. However, appropriate protection is necessary to guarantee its efficacy and longevity. The "wet facade" technology is one of the most dependable ways to protect mineral wool.

Using this method, layers of plaster are applied on top of the mineral wool to create a strong, weatherproof barrier. This technique not only improves insulation, but it also gives your external walls a polished, appealing appearance.

This post will demonstrate how to apply plaster over mineral wool using the wet facade technique, keeping your house safe, sound, and warm for many years to come.

Using "wet facade" technology, plaster is applied over mineral wool to improve insulation and shield the building’s exterior from the elements. By applying plaster directly on top of the mineral wool, this technique produces a facade that is both resilient and energy-efficient. It’s a simple process that offers modern, clean finishes along with the advantages of thermal insulation, which makes it a great option for both new construction and renovations.

Types of mineral wool

Insulation made of mineral wool comes in four varieties:

1. Glass wool – a material characterized by high strength and elasticity. Low hygroscopicity and low thermal conductivity make it the optimal solution for insulating the external walls of a house. When working with it, it is important to observe safety precautions, since it consists of glass threads that can injure the skin or get into the respiratory tract.
2. Basalt wool consists of diabase and gabbro, has very low moisture absorption. When in contact with fire, it does not burn, but melts.
3. Slag wool – the most budget insulation, but it has several serious drawbacks: high hygroscopicity and thermal conductivity, residual acidity (when in contact with it, metal surfaces will oxidize). For high-quality insulation of the walls outside the house, a thick layer of material is required.
4. Rock wool is a fire-resistant vapor-permeable material that practically does not absorb moisture. It has excellent soundproofing properties and durability.

Density of mineral wool

One of the key elements of mineral wool is its density, which is influenced by the production process and establishes the type of application for which it is appropriate.

To reduce noise and improve interior spaces, use light mineral wool (30-80 kg/m3).

A ventilated facade device should use insulation with a density of 80–130 kg/m3.

Make use of a specific facade series when installing a "wet facade." Mineral wool for plastering has a density of 130–160 kg/m3. This kind of material is very strong and can support the weight of the plaster mortar.

Slabs with dimensions of 50*100 or 60*120 cm are produced. The material’s thickness ranges from 5 to 15 cm; slabs with a thickness of 10 cm are typically employed. Although it is more challenging to locate material with the necessary density, mineral wool can also be utilized as facade insulation in the form of mats that have been twisted into a roll.

Stone wool manufacturers

Numerous companies produce mineral wool for external wall insulation; the most well-liked ones are:

• Rockwool (Facade Butts series);
• Ursa(Geo Façade);
• Isover(Facade and Plaster);
• Knauf (TS 032 and TS 034 Aquastatik);
• TechnoNIKOL (IsoboxFacade).

Choosing plaster for the facade

The "wet facade" method of mineral wool insulation involves using aqueous solutions for each step of the process, with plastering serving as the final touch.

There are four different kinds of facade plaster mixtures, and the components that go into the mixture determine the characteristics of the finished coating.

Mineral

Cement and other additives are used in the production of mineral plaster, which improves the product’s plasticity and adhesion. Microfiber fibers are added to the mixture to increase strength, and certain compositions include ingredients that improve moisture resistance.

Cement mortar is not advised for use in processing walls that may be subjected to significant mechanical stress because it has a higher strength but a lower plasticity than other types.

Provided in a dry state. Known brands include Baumit, Ceresit, Bolars, and Knauf.

Acrylic

A ready-to-use mixture based mostly on acrylic resins with a tiny amount of mineral ingredients is called acrylic plaster. The resistance to temperature changes, durability, and plasticity of the coating are its distinguishing features.

Among the benefits are:

• water resistance, which is especially important for coatings used for external walls;
• high adhesion;
• large selection of shades;
• easy to apply;
• quick drying;

Manufacturers include Ceresit, Knauf, Bolars, Weber, and Technodecor, as examples.

Silicate

Acrylic resins and potassium silicate are the ingredients of this kind of plaster. The combined effect of these two properties makes the final coating flexible, vapor-permeable, and long-lasting. Fantastic for wool with minerals.

• Experience is required for application;
• The work must be done quickly;
• Before applying the plaster, the surface must be treated with a silicate primer.

Ready-made and packaged in various-sized plastic containers.

Manufacturers: Kema, Ceresit, Baumit, and Caparol.

Silicone

Possesses all the advantageous qualities of compositions on other bases, including flexibility, vapor permeability, non-toxicity, good surface adhesion, and resistance to dust and dirt attraction. The final coating is immune to mildew, mold, and fading.

Cons: It is expensive and best to use silicone primer as a foundation.

Provided prefabricated. Produced by: Weber, Baumit, Ceresit.

All of the plaster varieties under consideration are appropriate for use in the building of a wet facade.

Builders frequently utilize mineral cement compositions to save money, but this means that a decorative layer or painting will need to be applied afterwards.

Plastering mineral wool over it with "wet facade" technology is a practical and effective way to insulate and protect the outside of buildings. By combining insulation with a long-lasting, weather-resistant finish, this method guarantees that the building will always be both aesthetically beautiful and energy-efficient.

When applied properly, this technique provides durable protection for the structure against moisture, temperature changes, and other environmental aggressors. Careful planning, exact application, and material selection are essential for success.

All things considered, "wet facade" technology is a dependable choice for individuals trying to improve their building’s thermal performance and achieve a polished, appealing exterior. When used correctly, this method can greatly enhance your building’s or home’s appearance and functionality.

Video on the topic

External insulation of walls with mineral wool (video instruction)

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Workers violate the technology of gluing mineral wool! This is how you can not insulate facades!

How to glue mineral wool to the facade of a house, everything is simple.

Priming the surface of mineral wool with glue before installing the base reinforcing layer

Why you need to prime mineral wool with glue, how this technical operation is performed, SFTK Wet Facade

Installation of a plaster "wet" facade | Instructions

Preparing the surface of mineral wool for the device of the Base Reinforcing Layer, priming mineral wool