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August 12, 2017 18:06

How to make plaster on concrete blocks ?

How to make plaster on concrete blocks ?

Foam concrete - a material that can not stand the humidity, and the most affordable way to protect it from damp shrinkage and cracking - a plaster on concrete blocks.

Air blocks - special building blocks, made of porous concrete.

This material is well known to even non-professional builders, it has long been very popular and is used in modern construction.

This high popularity is characterized by such indicators as:

  • low weight;
  • good thermal insulation properties;
  • inexpensive;
  • easy to install.

material served to you for a long time, it is necessary to know how to plaster the walls of the foam block, as competent external coating is the main factor of strength.

surface of the foam blocks you need to decorate the outside of the facade and inside the house.

importance plastering blocks can not be overstated, if not work, as shown in the video, you can ruin all the positive characteristics of this building material.


plaster on concrete blocks - a very complex process, that is, to this material has very poor adhesion properties, conventional plaster of cement, sand and lime to it do not stick...It is for this reason it is best to exclude all-purpose mixture for plastering.

order in your room did not get wet, concrete blocks do not crack, and inside pockets of mold not appear, you need to properly protect the inner and outer side walls.

for buildings built of concrete blocks, the main indicator - water vapor permeability, it is necessary to comply with the ratio of the thickness of the plaster layer on the inside and outside.

If you are plaster with your hands and are unfamiliar with the technical aspects, in order to make your walls remain permeable, the thickness of the inner layer should be 2 times larger than the external.

layer should be thick - within 1 centimeter and 2 centimeters from the outside would be sufficient.

Despite the seemingly complexity of the process, Foam concrete plaster wall of the house with his own hands can not only professional builder, but any person, it is only necessary to read the instructions and watch the video that we give.


  • Types of foam concrete blocks
  • solutions used for plastering the foam blocks
  • Tools for finishing
  • Preparing for plastering
  • Plastering the walls of the foam blocks

Types of foam concrete blocks

foam blocks produced by mixingcement, sand, water and foaming agent, which can be natural or synthetic.

foam blocks are produced by two different technologies:

  1. Injected technology - ready solution is poured into a special.shape, where it passes the forming and drying process.Simple production technology does not provide a perfectly flat surface of the block, to improve the adhesive properties, it is desirable to make the surface treatment coarse sandpaper;
  2. sawing method - of foamed concrete molded one-piece big design, which is then divided by sawing into blocks of the desired size.Blocks made by this technique, have better adhesion properties, and they are easier to plaster.

Plastering the walls of the foam is made not earlier than 28 days from the date of their manufacture.These days may be possible cracking.

Types of foam blocks

If plaster blocks that have not been exposure - this can have a negative impact on the whole process and as a plaster.

solutions used for plastering the foam blocks

Before finishing Foam concrete walls need to choose the right plaster, having a wide range of characteristics:

  • vapor permeability;
  • elasticity;
  • high adhesive properties;
  • moisture;
  • resistance to freezing temperatures.

plastering raw material for foam blocks produced a variety of construction companies producing dry mixes.

Plastering of walls in homes with high levels of humidity is best done with mixtures, resistant to moisture, produced based on cement.


outer facade decoration involves the use of the same mixture.Previously such walls properly handle moisture repellent coatings.

Packages containing dry mixes designed for foam, marked with a special note that this material is suitable for use on surfaces with a porous cellular structure.

Price category of such mixtures is usually higher than that of the classic finishing compositions.But if your room is made of foam, you have to not skimp on construction mixture, t. To. Only with it you can perform high-quality coverage.

Tools for finishing

set of tools used for plastering small:

  • building level;
  • roller;
  • profile;
  • spatula or bevel;
  • rule;
  • Building mixer;
  • brush.

Preparing for plastering

Before starting work on the application of plaster is necessary to make the initial alignment of the surface, seal the chips and cracks.Then

wall facade foam concrete must be applied to the undercoating layer solution using a roller at locations where this is not possible, or it is applied with a paint brush.

For priming is necessary to use the facade of the deep penetration of the solution with a high level of adhesion.Typically, the primer is applied in two layers, so the plaster will be applied much more easily.

One of the main rules before applying the primer - a drawing on a clean and degreased surfaces if concrete blocks are visible oily stains, they should be removed with the help of special tools.

Application putty

Otherwise, the coating will fall off immediately after drying.

Primer facade should be done only with quality materials, applied to the material on top of it served for a long time.

Allow the primer layer to dry thoroughly and then you can proceed directly to the plastering.

Plastering the walls of the foam blocks

After purchasing all the necessary tools and materials, you can safely proceed to the working process.

For better adhesion to the surface of the walls of foam concrete reinforcing mesh is placed with resistance to alkaline attack, in the case of the destruction of the grid on the plaster will crack, and its service life is significantly reduced.

After this, in the order you desire container with water to dissolve a mixture of plaster, this is done by means of the construction of the mixer, if this is not, you can use an ordinary drill with an attachment, which can be purchased at almost any hardware store.

Now you can start to apply the plaster on the wall of the facade.To do this, take Malka plaster or putty knife and start to put the finished solution upwards.

The technology application is no different from any other plaster surfaces.

But do not overdo it, the thickness of the finishing layer should not exceed 2 centimeters outside and inside, respectively, 4 centimeters.

wall consisting of cast concrete blocks, pre-need to put a layer of fiberglass mesh, which is fastened with dowels or nails.

It is important to fix the net - as close as possible to the wall, as shown in the video on this depends the extent to which a thick layer of plaster, you'll apply.


When you place a layer of fiberglass mesh, it is not necessary to fix the reinforced mesh.

Since the foam does not absorb moisture, the plaster is dry for much longer, it will produce a grout slowly and align the finishing layer.

After grouting facade again primed in a single layer.Upon completion of all finishing work, you can for extra protection against cracking process water-repellent plaster solution.

To give the front of the house an attractive appearance, it is possible to paint the wall after complete hardening plaster.The paint for the facade is chosen specially for use with foamed concrete.

best to paint was produced by means of a silicone-based, having the appropriate level of vapor permeation.You can also decorate the wall of any material of your choice.

On top of a few practical tips.When buying a foam block, pay attention to its color, it should be gray, yellow color indicates an excess of sand, this material will be fragile.


If you must keep a long time blocks, then do it under cover and plastic wrap.

After completing all of the above works, you get a smooth, durable surface of your home.