Plastering aerated concrete – preparing the base of the walls inside the room (house) with your own hands

A rewarding project that can significantly improve the appearance and longevity of your walls is plastering aerated concrete walls inside your house. Because of its lightweight and insulating qualities, aerated concrete needs special preparation before plastering in order to provide a smooth and durable finish.

Cleaning the surface completely is the initial stage in the preparation of aerated concrete walls. It is essential that all loose particles, dirt, and dust be removed in order for the plaster to adhere correctly. Getting a clean base can be facilitated by using a vacuum or brush.

It’s crucial to apply an appropriate primer next. By taking this step, the plaster will adhere to the aerated concrete more effectively. The best primer is one made for porous surfaces because it gets inside the material and gives the plaster a solid bond.

Cracks and uneven areas should be filled with an appropriate filler after priming. This produces an even and smooth surface, which facilitates the plastering process and improves the finish. Before proceeding to the next step, let the filler completely dry.

Lastly, precise attention to technique is needed when applying the plaster. Working in small sections, evenly distribute the plaster using a trowel. To achieve a professional look, consistency in thickness and smoothness is crucial. Plastering aerated concrete walls can be a do-it-yourself project that is manageable with the right tools and patience.

Step	Description
1. Clean the surface	Remove dust, dirt, and any loose particles from the walls using a brush or vacuum cleaner.
2. Apply primer	Use a suitable primer to ensure better adhesion of the plaster to the aerated concrete surface.
3. Install reinforcement mesh	Fix a fiberglass mesh to the wall to prevent cracks and improve plaster durability.
4. Mix the plaster	Prepare the plaster mix according to the manufacturer"s instructions, ensuring a smooth consistency.
5. Apply the plaster	Spread the plaster evenly over the wall using a trowel, starting from the bottom and working upwards.
6. Smooth the surface	Use a straightedge or float to level the plaster and create a smooth finish.
7. Allow to dry	Let the plaster dry completely before applying any further finishes or paint.

Basic requirements for plaster

Aerated concrete wall plastering, whether indoors or outdoors, needs to adhere to specific standards. Typical mixes aren’t always appropriate in this situation. Traditional cement-sand mortars exhibit high density, which makes them difficult to stick to the block and prone to cracking easily. In this instance, adhesion—that is, the adhesion of surfaces made of various materials—is crucial.

Plaster for interior work must also preserve the best possible microclimate within the space, shielding the walls from moisture and preventing the growth of mold, mildew, and other issues. Vapor-permeable base mixtures are selected for aerated concrete in order to facilitate the passage of steam through the walls and prevent it from building up inside the block pores.

• Resistance to various external negative factors.
• High level of adhesion to the aerated concrete block.
• Resistance to moisture, sudden temperature changes.
• Good compressive strength to avoid the risk of crack propagation.
• Vapor permeability.
• Optimal density.
• Decorative (if subsequent painting is not planned).
• Improving the thermal insulation properties of walls made of aerated concrete.

Plaster on aerated concrete consistently shields walls from all harmful elements from the inside and outside, greatly extending the service life and enhancing the standard of operation of the home.

Types of plasters suitable for aerated concrete blocks

You should consider the compositions that are appropriate for the specified material and the conditions of use when deciding what to plaster with aerated concrete inside or outside the house. Plaster compositions that protect the aerated concrete block, exhibit good strength indicators, are resistant to moisture, and serve as thermal insulation are available for external facade finishing.

Plaster designed for this kind of work is used for interior decoration of the building; it must pass steam well, be free of harmful compounds and toxins, and be moisture-resistant (important for finishing the kitchen and bathroom but not as much for other rooms). Plastering walls composed of aerated concrete requires the use of compositions based on cement and lime, silicone, silicate, acrylic, etc. d.

Popular plasters for aerated concrete

Prior to plastering aerated concrete walls, you must select the appropriate composition, considering all of the benefits and drawbacks, evaluating compliance with operating conditions, budget, etc.

– manufactured using organosilicon resins and polymers. produces a long-lasting, superior coating that keeps its elasticity after application and drying, and it stops cracks from forming even if aerated concrete blocks shrink. Because of the pigments and unique fillers added to the mixture, silicone finishes have a very attractive appearance.

Because of its numerous operational benefits, durability, and decorative effect, silicone plaster is regarded as the best type. However, the price of these mixtures is much higher than that of other plasters.

Plastering aerated concrete blocks with cement-sand mixtures is not a good idea. They don’t exhibit all the qualities necessary for aerated concrete structures, are positioned on the block surface rather shoddily, and cause cracks to appear quickly.

The most popular manufacturers

The market for building materials today provides a sizable assortment of different mixes for construction and repair work. Therefore, it’s crucial to take into account both the plaster types and the manufacturers when deciding which composition to use. Certain features and costs are implied by different brands.

Owing to the mineral content, the mixture is plastic, making handling it easy. Additionally, the coating can easily endure 100 exposure cycles to low temperatures. Painting is required, and it is done one week after the plaster has dried.

A smooth and long-lasting finish can only be achieved by plastering your home’s walls, especially if you’re using aerated concrete. In order to guarantee good adhesion, the surface must be cleaned and primed. Next, a base coat is applied to even out the wall. By following these instructions, you can lay a strong foundation that will increase the plaster’s longevity and performance in addition to improving the interior’s aesthetic appeal.

Features of plastering walls made of aerated concrete blocks

The question of whether or not to plaster aerated concrete walls—both inside and outside—is moot since, in the absence of any special finishing, the walls will only last so long before they start to decay and develop mold, cracks, and other problems. Selecting the appropriate plaster composition and carrying out all work in compliance with technology are crucial.

Internal plastering of walls made of aerated concrete

Gypsum mixtures with different additives are typically used for interior finishing. Composites can add to the finish’s decorativeness (marble crumb, perlite, etc.d.). Any color can be used to paint the composition. One option is to select an unadulterated gypsum mixture, as they all offer a satisfactory degree of vapor permeability and can serve as a foundation for applying wallpaper adhesive.

• Elimination of irregularities, cracks and chips on the surface of walls from blocks.
• Thorough dust removal.
• Applying a primer.
• Installing beacons and throwing the first layer of plaster, its processing.
• Installing a reinforcing mesh.
• Careful application of the second layer of plaster.
• Painting the walls, gluing wallpaper or applying a decorative layer of plaster mixture.

First things first: level the walls. If this wasn’t done when laying the walls, then carefully remove any irregularities with a float or plane. If the walls are not leveled, a lot more plaster will be used, increasing the layer’s thickness and potentially causing cracks and peeling of the plaster.

The walls then receive an application of primer. Prior to doing this, you can use a roller or brush to apply clean water in the same manner as a primer to remove any dust from the surface. You can apply the primer mixture after the water has dried. The selection is based on the operational conditions of the space: deep penetration soil (such as Prospectors) is preferable for the kitchen and bathroom, while any universal mixture (Unis is suitable) is appropriate for the hallway or corridor.

Beacons are inserted to measure the plaster layer’s thickness once the primer has dried. They are fixed to the width of the rule; a building level must be used to verify accuracy. Subsequently, the "fur coat," or first plaster layer, is applied, working its way up from the bottom. It is necessary to lay down on the beacons, draw a layer out along them, and then promptly fill in the spaces.

Making sure the plaster doesn’t peel off the base is essential; if this happens, the plaster is taken off, the surface is primed, and the solution is reapplied.

When the first layer has dried, it is slightly moistened with a spray bottle and leveled. Beacons can become a cold bridge, so they need to be removed and the areas sealed with plaster. To arrange and strengthen the corners of the outside, a special perforated corner with a mesh is mounted.

Each unique situation is evaluated independently to determine whether a mesh is required for the walls; this is largely dependent on the operating parameters, the plaster solution selected, and other factors.

After applying the second coat of plaster, everything is meticulously leveled and rubbed once it has dried. Painting is completed after the last grouting, if painting is planned. There are additional specifications for the paint, including the need for it to be vapor-permeable (based on latex, PVA, acrylic emulsions, cement, and organic solvents). While rooms with high humidity should use AquaNova Premium, regular rooms should use ESKARO AKZENT.

External plastering of aerated concrete walls

The base needs to be prepared as quickly as possible, regardless of the type of aerated concrete plaster that is used. Facade mixtures can be painted in one thick layer (thick-layer plaster) or multiple thin layers (thin-layer plaster). The three-step algorithm for applying a thin-layer mixture is shown below; it is simpler to work with thick-layer mixtures.

• Surface preparation – leveling makes it possible to reduce the consumption of the mixture.
• Thoroughly coating the wall with a primer.
• Applying a thin layer of plaster (up to 5 millimeters), which will become the basis for reinforcement.

The wall then needs to be strengthened. Fiberglass or steel with a wire cross-section of 0.1 millimeters and a cell pitch of 0.16×0.16 millimeters are suitable materials for the metal mesh used as a reinforcing layer. The corners are formed with a perforated corner and mesh, and the mesh is secured with a 50 millimeter overlap. By doing this, the possibility of wall cracks resulting from structural shrinkage will be eliminated.

A staple is used to sink the mesh into the moist layer. It is preferable to avoid using self-tapping screws because, unlike installing reinforcement directly into the mixture, they are attached to the base and do not form a monolith with plaster.

After allowing the first layer to dry—which may take up to four days, depending on the thickness of the layer—apply the second layer, or leveling, gradually and evenly to create the smoothest surface possible. Next, apply and smooth down the third and final layer of plaster. The wall can now be finished with textured plaster or painted. It can be Pobedit-Koroed, Nova-Fasad paint, Dufa Gasbetonbeschichtung, ROLPLAST Gordianus, or Dyotex.

The wall should be treated with a water repellent a year after completion in order to enable the surface to withstand water resistance. Neogard has demonstrated its worth.

Optimal conditions for applying plaster

Plastering can be done inside the house year-round, but outside work needs to meet specific requirements. Usually, all internal work related to elevated humidity levels is completed first. Aerated concrete wall supporting structures should have a maximum humidity of 27%. If it is higher, the plaster will just peel off because it won’t stick very well.

Finishing the facade at the end of the summer is ideal, and interior finishing is best done in the spring. The ideal ambient temperature is between +5 and +30 degrees, with a maximum air humidity of 80%. If plastering at minus temperatures is necessary, use specific deep penetration primers until the weather is ideal.

Plastering is not possible in the heat, direct sunlight, or high wind. The plaster will soon start to peel off and crack, even if it lays well.

With a little perseverance and the appropriate equipment, you can easily prepare the base of your aerated concrete walls for plastering. The secret to getting a long-lasting and appealing finish is making sure the surface is clear, even, and adequately primed. You can save money and have the satisfaction of doing the work yourself by following these steps.

Start by looking for flaws in the walls and sealing any gaps or cracks. Plaster will adhere more readily and last longer on a surface that has been prepared properly. For the plaster and wall to adhere well, it is essential to use a primer made for aerated concrete.

The plaster should then be applied in thin, even layers, letting each coat completely dry before applying the next. This layering method guarantees a smooth, even finish and keeps cracks from forming. This step should be completed slowly because hurrying can result in uneven surfaces and more work later on.

Smooth the plaster down and make sure it’s ready for painting or additional decoration to complete the job. In addition to having a fantastic appearance, properly plastered walls improve the room’s durability and insulation. You can accomplish professional results in your home improvement projects by being meticulous in your planning and paying close attention to details.

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