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Instructions for filling walls

The different filling work on walls indoors

The filling of walls is probably one of the most classic do-it-yourself jobs. At least when it comes to filling drilled holes or cracks. But also the filling of wall cracks and slots for water and electrical installations is a work that is always necessary. Then there is the filling of plasterboard walls. Even tile walls and tile mirrors can be filled if the old tiles no longer appeal. All filling work has in common that it is carried out indoors.

Interior fillers are usually gypsum fillers

There is also a difference between the leveling compound used and the outside area. Cement-based fillers are used on the outside, while building materials containing gypsum are used on the inside. Otherwise, the filler can be differentiated according to its fineness. There are also refined fillers. These are leveling compounds coated with plastic. The higher the quality of this coating, the more expensive the putty will be - however, this putty is also excellent in terms of quality. The filler for damp rooms can take a special position.

Step-by-step instructions for puttying walls

  • Leveling compound, depending on the application
  • possibly adhesion promoter
  • Reinforcement material (depending on the application)
  • Edge or corner profiles (depending on the application)
  • water
  • Plaster cup
  • Drill (€ 80.31 at Amazon *) with agitator
  • Mortar (€ 7.79 at Amazon *) bucket
  • Trowel (smoothing trowel), depending on the application
  • Tassel

1. Preparation before filling the walls

First of all, you should clean the wall to be filled with a broom free of dust. You can then slightly moisten the surface to be filled in order to better bind any possible dust.

Depending on the substrate, you may need to apply an adhesion promoter first. For example, on old tiles, it is imperative to pretreat them accordingly, as the tile surface cannot give the filler enough hold in the long term.

2. Mixing the filler

Now you can mix the filler. Regardless of whether you are using a small plaster cup (for filling holes, etc.) or mixing the filler in the mortar bucket (for example when filling plasterboard walls), fill in the water first. Then let the filler trickle into the water until the container is just below the surface of the water. If you stir the mass evenly, you will get a smooth filler.

3. Filling walls

In the case of joints between two plasterboard panels, pull the spatula across the joint with a trowel or smoothing trowel over the joint. So make sure that the joint is really completely filled with filler. For filling holes, you can fill them with plaster of paris with a conventional spatula.

If you want to finely fill entire walls, you can first apply the filler regardless of the direction of movement. For final smoothing, pull the applied spatula either in circular movements (in a semicircle) from top to bottom or from bottom to top.

4. Connection work after filling the walls

After you have completely hardened the puttied walls, you can start with the following work, for example sanding the puttied walls.

Plaster of paris has a water-attracting effect. You should therefore use suitable leveling compounds in damp rooms such as bathrooms. If you have applied plaster-containing filler, you must then apply a barrier primer.

When filling plasterboard walls, lay reinforcement strips in large joints. These consist partly of cellulose or fiberglass material.

If the filler slowly sets, you have to stop using this filler. From now on, small lumps will form with which you would create furrows in the already applied filler.

If you have to apply putty relatively thick, apply the thinnest possible layers in several working steps. This will prevent the entrapment of air, which can cause bubbles to form. In addition, putty that is applied too thick will tear quickly.

Author: Tom Hess

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