Achieving the perfect Level of Finish
Understanding the Levels of Finish for plasterboard is critical in meeting AS/NZS Standard 2589 Gypsum Linings Application and Finishing standards. Levels of Finish should be considered in the design stage and are determined by factors such as the decorating finish, light type and direction, and location in the building or home. Use this as a guide in helping you achieve the perfect plasterboard finish!
Firstly, let’s break down Glancing Light, also known as “Critical lighting”.
This is where natural or artificial light is projected across a surface at a low or parallel angle. This highlights imperfections and surface texture variations such as joints and patches. Non-Critical Light means that the light that strikes the surface is diffused and is not glancing or parallel to that surface.
Now, let’s find out what the Levels of Finish are and how to achieve them.
Unless otherwise specified a Level 4 plasterboard finish as defined in AS/NZS 2589 shall be taken as the standard finish for plasterboard presented for painting.
Level 3
- Lowest Level of Finish.
- Areas that do not require a finish (such as above ceilings and inside service shafts).
- Heavy grade wall coverings.
- Not generally acceptable for painted finishes.
Compounds application:
- All joints are to be taped with two applications of compound.
- All fastener heads are to be covered.
- Compound is to be finished smooth, such as by scraping ridges etc. with a trowel.
Level 4
- Minimum Level of Finish (if not otherwise specified).
- Flat, matt or low sheen paints.
- Light textures and wall coverings.
- Non – critical light conditions.
- Finished stopping must be smooth and free of all tool marks.
Compounds application:
- Three-coat system; a tape coat plus two subsequent coats applied over the tape coat and fastener heads.
- All joint compounds should be sanded to a smooth finish, free of tool marks and ridges.
Level 5
- Highest Level of Finish.
- Gloss, semi-gloss, low sheen or non-textured flat paints.
- Critical light conditions exist.
- Paint is mid or dark coloured.
Compounds application:
- Requires high level of frame alignment to ensure a smoother surface.
- All joint compound should be sanded to a smooth finish, free of tool marks and ridges.
- This should be followed by the application of a skim coat to remove differential surface textures and porosity.
Lastly, use this tool to help you specify the Level of Finish required for each area of your project…
ADX Depot are happy to assist with any compound and plasterboard related questions you may have. Please call our friendly team on (08) 8292 5000 or email [email protected].
