How to Level Walls and Ceilings Made of Gypsum Board

Prepare walls in an apartment or on a cottage for wallpapering not only with plastering but also with gypsum board panels. Leveling joints and the base will not be a big effort if you use suitable finishing plaster and correctly perform the installation process.

1. Preparing the Base

Remove substances that impair adhesion — grease, dust, peeling paint. The base must be dry. On gypsum board surfaces, check that the screw heads do not protrude beyond the cardboard plane. If necessary, tighten them.

2. Preparing the Mixture

Pour precisely measured water into a bucket, add a bag of dry finishing plaster mix weber.vetonit JS, and thoroughly mix the resulting solution using a powerful drill mixer until you get a homogeneous consistency. The mixture should be used within 30 minutes from the moment water is added.

3. Filling the Joints of Gypsum Board and Full Surface Leveling

1. With a wide spatula, apply weber.vetonit JS onto the prepared base so that the mixture fully fills the joint depression and edges of adjacent panels.

2. Press the joint tape into the joint with a steel spatula 75 mm wide. Apply excess mixture over the tape. Add more mixture to the tape so that the joint is completely filled.

3. Fully level the joints with a wide rigid spatula to achieve a smooth surface. After the mixture dries, sand the joints with fine sandpaper.

4. Fill corners with joint tape and fill them with a large volume of weber.vetonit JS. Fold the tape along the fold at 90 degrees and press it into the joint with a spatula. Apply excess mixture over the tape.

5. Perform final leveling of the gypsum board surface using weber.vetonit LR+ or weber.vetonit JS. Apply the mixture mechanically by spraying or manually.

6. After sanding and ensuring the surfaces are ready for wallpapering.