Plaster aerated concrete


Plaster aerated concrete: plaster

needed tools
  • spatula
  • Pressure sprayer or puff
  • trowel
  • trowel
  • Stirrer for drilling machine
  • mop bucket
  • spirit level
  • directional board
  • if necessary ladder
  • cover sheets
  • straightedge
  • float

When it comes to the plastering of cellular concrete, the area is important first. In the outdoor area or in wet cells and the like is the protection against moisture in the foreground, that means you have to plaster your Ytongsteine ​​here.

You do not necessarily need a manual for non-load-bearing interior walls and similar objects, as plastering is not absolutely necessary there. In that case, you can freely decide whether to plaster your ytong wall or whether it is sufficient to fill in.

With the right choice of plaster and tools such as plaster rails, almost any ambitious craftsman can also plaster. A prerequisite is a sensible tool, good material, the right information and to adhere to the instructions for use of the manufacturer.

How you can approach your project, what you can use and many other tips can be found in this guide.

Step 1: Obtain the right material

In any case, you need a suitable repair spatula and a good, suitable primer or plaster base.

Plaster aerated concrete: concrete

A liquid primer and a pressure sprayer - a good combination.

For indoor use, thin-layer plaster, light plaster and conventional gypsum and lime-cement plasters can be used. If you want to use the latter, it is best to use a gypsum plaster for the concealed plastering and only for the top coat of the Ytong plaster lime cement render (eg Rotband). In the outdoor or wet area, sealing slurries are also recommended.

Cleaning rails facilitate a clean uniform application. For transitions to other surfaces (eg concrete), it is essential to use reinforcement or aramid fabrics to prevent cracking later on.

When plastering Ytong exterior: Keep in mind that the plaster must be protected from the sun, wind, rain and frost during outdoor processing and drying. Therefore, you should use a matching tarpaulin when Ytong plaster outdoor.

Step 1: Prepare underground

Loose parts, dust, sand and more First remove by wiping or brushing. Repair damaged areas with a suitable repair spatula and smooth.

Let it dry well.

Plaster aerated concrete: aerated

The primer can be applied to the open-pored ytong.

When Ytong plastering always prime. Apply primer - this is very easy with a very liquid primer with a pressure sprayer and brings much of the liquid in the rough, porous material. Alternatively, the plaster or primer with a large puff on the wall is painted.

Especially when plastering Ytong is the priming and wetting of the wall before plastering important to prevent so-called "cleaning fire". This type of damage occurs when the plaster is deprived of moisture from a highly absorbent surface much too quickly and therefore it can not set properly.

Tip: Before you plaster your ytong / aerated concrete, cover the floor well.

Step 2: Attach plaster rails

The plaster rails are glued perpendicular to the wall at a maximum distance of 120 cm. For this, they are first cut to the correct length (with the saw or an angle cutter or similar). As an adhesive, the plaster is used, which is then also plastered. Apply this selectively in the vertical there where a plaster rail should be glued.

Push the rails in and, if all the rails are against the wall, use a spirit level and a straightening board to correct the seat so that everyone is in the balance and in flight so that a straight plastered wall can be created.

Step 3: Mix in the plaster / wet the wall

For Ytong, a gypsum-based flush is generally recommended for its better adhesion. Otherwise come as a first layer of plaster in the interior of a thin-layer plaster or outdoors and wet areas a sealing slurry in question.

The plaster is mixed according to the manufacturer's instructions. Mostly he has to pull something before use, in time, the wall can be wetted once before. Again, the pressure sprayer is very good to use again or alternatively a puff.

Plaster aerated concrete: plaster

If the flush is applied, it must be sufficiently long, protected and, above all, dried slowly.

Plaster aerated concrete: concrete

Smaller quantities can be mixed with the trowel, for larger you should use a stirrer.

Step 4: Apply flush

If you have a little practice, throw the plaster with the cleaning trowel on the wall and spread it with the trowel. Straight off with a stripper over the quick-release rails. In the case of thin-layer plaster, a single, thin coat of a few millimeters is spread over or filled (please follow the instructions on the package).

The plaster must dry as long as the manufacturer claims, before a second coat of plaster can be applied.

Step 5: Second plaster layer - top coat

plastering the wall is wetted again as already described in step 3. Then the plaster is mixed with the stirring stirrer according to the manufacturer's instructions and applied piece by piece with the smoothing trowel. This layer is usually thinner (to a maximum of 1 centimeter thick.

Plaster aerated concrete: concrete

Cotton plaster is open-pored and natural.

For this purpose, the plaster is applied in small quantities with the cleaning trowel on the smoothing trowel and brushed with the slightly inclined trowel on the wall. Whenever about two square meters are finished, smooth with the Abziehlatte. If you would prefer to have a rubbing finish, use a floater to rub the circles over the plaster, which has already been tightened, and then smooth it out. This requires a little more experience in dealing with the material and should perhaps have been practiced once in a visually less sensitive place (basement and the like), before it goes to a living room wall.

Again, the plaster must be completely dried before the surface can be painted with paint or covered with wallpaper or tiles. On a plaster, a vapor-permeable final coating should always be used.

Author: Christiane Baldwin

Photo Credits:
  • Cotton plaster: Riccardo Düring
  • all other pictures: Christiane Baldwin

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Video Board: Plastering a Concrete Block Wall | DIY Projects