Plastering a wall may seem like a daunting task, especially if you’re not accustomed to DIY projects. But don’t worry—you don’t need to be a seasoned professional to achieve great results. In this step-by-step guide, we’ll walk you through everything you need to know about plastering over an existing wall that needs levelling off. By the end of this post, you’ll have the confidence to tackle your own DIY plastering projects and create a smooth, even surface for painting or decorating.
Why Level a Wall with Plaster?
Walls with uneven surfaces, cracks, or holes can ruin the aesthetics of your home. Whether you’re planning to sell or just want a fresh look, leveling the walls with plaster is a great way to ensure a smooth finish. Plus, it can be a satisfying and rewarding DIY project once you see the transformation.
What You’ll Need to Get Started
Before diving into the steps, gather these essential tools and materials:
- Plaster mix
- Plastering trowel
- Straightedge or spirit level
- Bonding agent (like PVA)
- Filler and putty knife
- Sandpaper (various grits)
- Bucket and mixer drill
- Protective gear (gloves, goggles, dust mask)
Step-by-Step Guide to Plastering Over an Existing Wall
Step 1: Preparation
Preparation is key to a successful plastering job. Here’s how to get your wall ready for the new layer of plaster:
- Inspect the Wall: Check for cracks, holes, and uneven spots. These need to be addressed before you can start plastering.
- Clean the Surface: Dust, dirt, and loose plaster can affect the adhesion of the new plaster. Wipe down the wall with a damp cloth and remove any debris.
- Repair Cracks and Holes: Fill any cracks or holes with filler and let it dry. Sand it smooth once it’s set.
- Create a Key: If the wall is too smooth, you need to create a “key” for the new plaster to grip. Lightly scratch or score the surface with a utility knife or scraper.
- Apply a Bonding Agent: A bonding agent like PVA (diluted with water) helps the new plaster adhere. Apply it to the wall and let it dry as per the product instructions.
Step 2: Applying the Plaster
With the wall prepared, it’s time to apply the plaster:
- Mix the Plaster: Follow the instructions on the packaging for the correct consistency. Use a plaster mixing bucket and a mixer drill for a uniform mix.
- Apply the First Coat: Use a trowel to spread a thin, even layer of plaster on the wall. Start from the top and work your way down. Aim for a thickness of 2-3mm.
- Smooth the Surface: Use a straightedge or spirit level to ensure the plaster is even. Smooth out any high or low spots.
- Allow it to Set: Let the plaster set, but not completely dry, before applying the second coat. This usually takes about 30 minutes to 1 hour.
Step 3: Finishing
Now that the first coat is set, let’s finish the plastering job:
- Apply the Final Coat: Apply a thinner coat of plaster, about 1-2mm thick. Smooth it with a trowel to ensure an even surface.
- Polish the Surface: As the final coat starts to set, use a clean trowel or float to polish the surface. This can create a smooth, shiny finish.
- Let It Dry Completely: Allow the plaster to dry completely. This can take 1-2 days, depending on the environment and thickness of the plaster.
- Sand if Necessary: If there are any rough spots, lightly sand with fine-grit sandpaper to smooth them out.
- Decorate: Once the plaster is dry and smooth, you can paint or wallpaper to complete your project. Usually between 5-7 days after plastering.
Final Thoughts
Plastering over an existing wall may seem intimidating, but with the right tools and a little patience, you can achieve professional-looking results. Follow these steps, and you’ll have a level, smooth wall that’s ready for decorating. Remember to take your time, double-check for any imperfections, and, most importantly, enjoy the process. DIY projects are a great way to add a personal touch to your home, and there’s nothing like the satisfaction of a job well done.