Mar 30, 2019

Plaster concrete walls do it yourself

Having observed the professionals, you might think that you can easily and easily plaster any wall, including concrete. However, when it comes to independent work, it turns out that everything is much more complicated, and at first glance, from the side, it would seem, elementary work may not work, or be done with difficulty. Yes, plastering concrete walls with your own hands requires knowledge and preparation!

No matter how smooth the wall, the preparation of the surface is necessary - whether the wallpaper will be glued, or maybe you plan to revet or decorate it with decorative plaster. The durability of the applied materials depends on how well the preparatory work is performed. But the plaster serves not only for these purposes - with its help:

the seams of concrete blocks or formwork traces are covered.
quite a bit, but still improves insulation.
moisture is prevented from entering the wall.

Surface preparation

First of all, you need to cut down the protrusions of the walls and remove concrete drips and overflows. Then you need to clean the surface of the walls from dust and grease, or asphalt stains. If the wall is too uneven, or there are large potholes, then the metal wire "wire rod" needs to be fixed with dowels.

It should not hang out, so you need to secure it with tension and tie it with wire.

The diameter of the rod should be 6 - 10 mm, and the grid will be required with cells no more than 10 * 10 mm.

Tools and Materials

Plaster concrete walls do it yourself Plaster Falcon

In order to start work, you will need:

Plastering concrete. Either cement-lime, or polymer-cement plasticized mixtures.
Rule.
Level.
Wooden slats.
Screws.
Falcon plaster.
Trowel.
Half meter wedge.

Getting Started

As already mentioned, the composition of the solution is different. It can be based on a dry mixture, or a synthetic compound. Plasticizers are also added to such mixtures, which, depending on the purpose of the solution, can speed up or slow down the freezing, so you need to deal with this issue before purchasing the mixture, and prepare the solution according to the recipe printed on the package.

Plaster concrete walls do it yourself Grid

You will need wooden slats of the same height as the wall, 10 mm thick. With their help, you divide the walls into sections no more than a meter, which will greatly facilitate plastering work. If there are no ready rails, you will have to cut them.
Having outlined the places where the slats will be installed, attach them to the wall with screws on the stone, checking the verticality of their position by level. This mount is necessary because the slats will need to be removed.
After that, moisten the wall with a spray gun, otherwise the dry surface will very quickly absorb water from the solution, not allowing it to firmly attach to the wall.
Knead the selected mortar and start plastering the room from the corners.
When applying plaster, try to level it with force, but only within two rails that can be used as beacons, removing excess mortar with a wedge.
After the entire area has been plastered, let the layer harden, and, having unscrewed the screws, carefully remove all the slats, smoothing the resulting grooves with the solution.

Plastering of concrete walls is painstaking, especially when the uneven wall has a very smooth surface. In this case, it is necessary to do serifs, clearing them to a depth of two centimeters. If you want to make the walls rough, then you can use a sandblaster, however, not everyone has such equipment.

If you have to apply a fairly thick layer of plaster, then it should be done in several stages, using a metal grid.

The solution is best applied with a thin layer (about 5 mm), thoroughly rubbing it into all roughness. You apply the following layer of plaster only after full drying previous. At the end of the wall is rubbed and smoothed.

Plaster concrete walls do it yourself Cement-lime plaster

When making concrete walls with your own hands, it is important to know that besides the compositions designed for these purposes, there is a "decorative plaster for concrete", which is very different in characteristics and it is not designed to align the walls. With its help, a decorative surface that imitates concrete is created, and it has completely different properties. Therefore, when buying, do not confuse decorative plaster with the plaster mix you need.

Watch the consistency of the mortar, and if you did not guess with water, pouring too much of it, put a brick in it for a few minutes. He will perfectly cope with this task, having absorbed the excess moisture, making the solution more thick.

In no case should we try to speed up the drying process of the walls, drying them with central heating or any other heaters, otherwise the plaster will crack and fall off. In the summer, do not even interfere with additional wetting.