1. Initial application:
When plaster is first applied to a wall, it can sometimes result in a rough texture. This is generally due to the plasters’ composition and curing process. Plaster consists of a mixture of water, gypsum, sand, and lime, which are combined to create a workable paste. During the initial application, if the mixture is not properly blended or applied unevenly, it can result in an uneven and rough surface.
2. Drying process:
The drying process of plaster plays a significant role in the final texture of the wall. Plaster takes time to dry completely, and during this process, it can shrink and create small cracks. If the plaster dries too quickly, it can also lead to a rougher finish. Factors like temperature, humidity, and ventilation can affect the drying process and therefore influence the final texture.
3. Sanding techniques:
After the plaster has dried, it is common practice to sand the walls to achieve a smooth finish. However, the effectiveness of sanding techniques can vary depending on the skill of the person performing the sanding. Inexperienced or rushed sanding can result in unevenness and roughness on the surface.
Potential solutions for achieving a smoother finish:
1. Preparing the plaster mixture:
To ensure a smoother application, it is essential to properly prepare the plaster mixture. Follow the instructions provided by the manufacturer and make sure to blend the ingredients thoroughly. This will help in achieving a consistent and smooth texture when applying the plaster.
2. Applying the plaster evenly:
When applying plaster, take your time to ensure even coverage across the entire surface. Use a trowel or a plastering tool to spread the mixture evenly and avoid creating uneven thicknesses. This will help in minimizing the potential for a rough finish.
3. Controlling drying conditions:
To avoid the plaster drying too quickly and resulting in a rough surface, it is important to control the drying conditions. Maintain a moderate temperature and humidity level in the room, as excessively high or low levels can affect the drying process. Proper ventilation is crucial to allow for adequate air circulation, which aids in the drying process and reduces the chances of a rough finish.
4. Sanding technique:
If the plaster walls still appear rough after drying, sanding can help to achieve a smoother surface. Invest in high-quality sandpaper and use it in a circular motion to even out any imperfections. Take your time and be gentle while sanding to prevent damage to the plaster.
5. Apply a skim coat:
In some cases, the roughness may not be easily corrected by sanding. In such instances, applying a skim coat can provide a solution. A skim coat is a thin layer of plaster applied over the existing surface to create a smoother finish. This method is particularly effective when dealing with larger imperfections or unevenness on the walls.
While new plaster walls can be rough, there are several reasons why this may occur. It is important to consider factors such as the initial application, drying process, and sanding techniques. By following proper techniques and applying the necessary solutions, homeowners and builders can achieve a smoother finish for their plaster walls. Whether it be through careful preparation, controlling drying conditions, or employing additional techniques like sanding or applying a skim coat, a smooth and aesthetically pleasing plaster wall is achievable.