How to properly fill plasterboard for even surfaces

Once the wall has been fitted with gypsum plasterboard, it goes to the joints between the individual plates. These must be provided with putty to fill the gaps, so that later no visible transitions are present.

Basic filling and finishing of plasterboard

By leveling you want to get even surfaces, which no longer has any unevenness at the transitions through the grouting. This is necessary in order to obtain the desired result when painting or wallpapering the walls later. A distinction is made roughly between a Grundverspachtelung and the Nachspachteln. The basic filling serves to roughly fill the joints and the holes created by the screw connections. As a rule, it is then necessary to apply a subsequent leveling in order to eliminate even minor imperfections during the basic filling and to obtain a smooth surface. The whole filling is thus carried out in several steps:

  • the basic filling or coarse filling
  • the post-filling to eliminate even minor bumps
  • the sanding of the filled areas

What you should consider before filling the walls

First, make sure the affected wall is clean and any remaining dust is thoroughly removed. Especially carefully you should proceed where later putty is to be applied. Make sure that all screws have been sunk correctly before you later apply putty to the screw holes as well. If not all screws have been completely sunk, you can do it now. In addition, each edge of a plasterboard should have a chamfer so that the filler can hold better later. Treat the joints with a deep background.

The pre-filling of the joints and how you should do it

In the next step, stir the putty according to the manufacturer. Do not use too warm water. Also make sure that no lumps arise. Now fill in the joints between the plates and the screw holes. First use a smoothing trowel to apply the compound across the joint, pushing it slightly into the joint. Then remove the excess mass with the wide side of the trowel along the joint. It is best to work first on the horizontal and then the vertical joints. The vertical joints are best filled from bottom to top.

Apply a second coat of filler

Normally, a second step is necessary to obtain even surfaces. Once the joints have been filled, they are ready for filling. Here you also eliminate finer unevenness that could not be completely leveled when coarse filling. Do not forget the screw holes that you may also need to rework. In addition, apply sealing compound to the outer edges of the plasterboard. Use permanently elastic sealants made of paintable materials. Finally, you can then grind the bumps, of course, only after the drying of the filler.

Artikelbild: ronstik / Shutterstock

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