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The quality level of the finish is defined taking into account the required flatness and the type of light it will be exposed to, which may limit the type of materials to be used and the dimensional tolerances.

QUALITY LEVEL 1 (Q1) – BASIC FINISH
Quality level 1 (Q1) corresponds to a basic finish and is intended for surfaces that must meet minimum decoration requirements.

QUALITY LEVEL 2 (Q2) – STANDARD FINISHING
Suitable for linings with a medium coarse texture, such as wallpaper in relief, matt painted linings, linings with filler or a medium or rough paint finish, linings with a grain size of more than 1 mm, where they are recommended by the manufacturer for use in plasterboard systems.

QUALITY LEVEL 3 (Q3) – SPECIAL FINISH
This type of finish is suitable for the production of linings with thin paint coating, painting and fine matt linings or finishes with a maximum grain size of 1 mm, provided they are recommended by the manufacturer.

QUALITY LEVEL 4 (Q4) – OPTIMUM FINISH
This type of finish is suitable for smooth or shiny wall coverings such as vinyl or metallic wallpaper, for the application of varnishes, paints or medium-gloss linings or even for the application of smoothed plaster or bitumen.

If the desired quality level is not defined in the project, the default quality level must be Q2.

Classifications and Recommendations:

Level
Joints
Surface
Q1
1 coat of filler + tape base Removal of excess filler in the joints. Grooves, burrs and marks made by the assembly tools are admissible.
Q2
Treatment level Q1 + 2nd coat of filler, wider than the previous one No visible tool marks or burrs should remain. The surface should be sanded, if necessary.
Q3
Treatment level Q2 + 3rd coat of filler, wider than the previous one No burrs or tool marks should be visible. If necessary, the grouted areas must be sanded.
Q4
Treatment level Q2 + finishing coat on the entire surface Surface level Q3. Application of finish coat to obtain a perfectly smooth surface.

This Eurogypsum document describes the four levels of joints and surface finishes of the plasterboards, before the final decoration is applied.

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