The 14 Reasons Most Plastering Fail

If you’re planning on plastering your walls or ceiling, avoid these fourteen common mistakes that can lead to an unsuccessful job. Plastering is a skilled trade and takes years of practice to perfect. Read more here. 

1. Overloading The Plasterboard

Too much weight on the plasterboard can cause it to sag or crack, especially around windows and doors. Make sure you check the maximum load rating of your plasterboard before attaching anything to it.

2. Not Securing The Plasterboard Properly

If the plasterboard isn’t properly secured to the wall studs, it can easily come loose, causing cracks and damage. Use screws or nails to secure the plasterboard, making sure they’re long enough to go through the thickness of the board and into the studs.

3. Poor Surface Preparation

Poor surface preparation is often the main cause of plastering failure. If the surface is not properly prepared, the plaster will not adhere correctly and will eventually fail.

4. Incorrect Mixing Ratio

Another common mistake is using too much or too little water when mixing the plaster. This can also cause the plaster to crack and flake off over time.

5. Applying Plaster To A Wet Surface

Plaster should only be applied to a completely dry surface. If even a small amount of moisture is present, it can cause the plaster to break down and crumble over time.

6. Applying Too Much Pressure When Sanding

Once the plaster has been set, it needs to be sanded down smooth before painting or wallpapering. However, applying too much pressure when sanding can cause the plaster to crack and flake off.

7. Skimping On Joint Compound

A joint compound is essential for creating a smooth, professional-looking finish. Don’t be tempted to skimp on it – using too little joint compound can result in an uneven, bumpy finish.

8. Applying Joint Compound Incorrectly

In addition to using enough joint compound, you also need to apply it correctly. For best results, use a putty knife or trowel to spread the joint compound evenly over the surface of the plasterboard.

9. Not Sanding The Joints

After the joint compound has dried, it’s important to sand the joints smooth. This will help create a professional-looking finish and prevent cracks from forming.

10. Hanging Pictures Before The Paint Is Dry

If you hang pictures or other decorations on the walls before the paint is dry, they can cause the paint to peel or flake. Make sure you wait until the paint is completely dry before hanging anything on the walls.

11. Using The Wrong Type Of Paint

Not all paints are created equal. Make sure you use paint specifically designed for plasterboard – using the wrong type of paint can result in peeling and flaking.

12. Painting Over Dust

Before painting, it’s important to make sure the surface is clean. Otherwise, the paint won’t adhere properly and could start to peel or flake. Use a vacuum cleaner or damp cloth to remove any dust from the surface before painting.

13. Applying Too Much Paint

Applying too much paint can cause it to drip or run, resulting in an uneven finish. When painting plasterboard, it’s best to use a thin layer of paint – applying multiple thin layers is better than trying to cover the surface in one thick layer.

14. Not Allowing The Paint To Dry Completely

Before adding any additional coats of paint, make sure the previous coat has had time to dry completely. Applying new paint over wet paint can cause the colours to run and create an uneven finish.

If you’re having plastering problems or are simply looking to avoid them altogether, make sure to keep these tips in mind. By taking the time to prepare surfaces correctly, mix the plaster correctly, and allow it to set properly, you can help ensure a lasting and professional finish.

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