As a construction expert with years of experience in building and renovation projects, I've come across a variety of scenarios where plastering over plasterboard is a topic of discussion. Whether or not to plaster over plasterboard can depend on several factors, including the intended finish, the condition of the plasterboard, and the overall aesthetic goals for the space. Here's a detailed look at the considerations and steps involved when deciding to plaster over plasterboard.
**Step 1: Assessing the Condition of the Plasterboard**
The first step is to evaluate the condition of the plasterboard. If the plasterboard is in good condition, without any cracks or damage, it may not require additional plastering. However, if there are imperfections, it might be necessary to apply a skim coat of plaster to create a smooth, even surface.

Step 2: Considering the Intended Finish
The intended finish plays a crucial role in the decision-making process. If you plan to paint or apply wallpaper directly to the plasterboard, additional plastering may not be necessary. The paper surface of the plasterboard can serve as the final finish when it's in good condition. However, if you're aiming for a more traditional or textured finish, plastering can provide the necessary base.

**Step 3: Evaluating the Need for a Skim Coat**
A skim coat is a thin layer of plaster applied to the plasterboard to create a smooth surface. It's often used when the plasterboard's surface is uneven or when a high-quality finish is desired. A skim coat can also help to hide minor imperfections and provide a better base for painting or wallpapering.

Step 4: Preparing the Surface
Before applying any plaster, it's important to prepare the surface. This includes cleaning the plasterboard to remove any dust or debris that could interfere with the plaster's adhesion. Any repairs to the plasterboard should also be completed at this stage.

Step 5: Mixing the Plaster
The plaster should be mixed to the correct consistency. This usually involves adding water to the plaster powder and mixing it until it reaches a creamy texture. The exact ratio of water to plaster will depend on the specific product being used.

Step 6: Applying the Plaster
The plaster is then applied to the plasterboard using a trowel. It's important to apply the plaster evenly and to smooth it out as you go to avoid any lumps or bumps. The plaster should be allowed to dry before any further work is done.

Step 7: Sanding and Finishing
Once the plaster is dry, it may need to be sanded to ensure a perfectly smooth finish. This is especially important if you're planning to paint or apply wallpaper. After sanding, the surface can be wiped clean and prepared for the final finish.

In conclusion, plastering over plasterboard is not always necessary, but it can be beneficial depending on the project's specific requirements. It's a process that requires careful consideration and attention to detail to ensure a high-quality result.

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A. Many new homes these days are not plastered internally. The stud partition walls, and often the inner faces of the outside walls too, are lined with plasterboard, but this is not skimmed with plaster. ... The paper surface of the plasterboard is the only finish, and paint or wallpaper is applied directly to it.Dec 5, 2006read more >>