Proper wall preparation before plastering is crucial. It ensures a smooth and durable finish, enhancing the overall quality and longevity of your plastered walls. Thorough prep work prevents common issues such as cracking, peeling, and uneven surfaces. By investing time in proper preparation, you achieve a professional look and extend the lifespan of your plastered walls, making future maintenance easier and more cost-effective.
Step 1: Pre-Plastering Home Preparations
Evaluate Electrical and Structural Changes
Before starting any plastering work, assess your electrical needs. Do you need more sockets or switches? Maybe some old fixtures need removing?
This is the perfect time to make these changes before any plastering. Contact a qualified electrician for these tasks. They’ll ensure the job is done safely and to code, preventing any future electrical hazards.
Additionally, consider your TV aerial placements. If you plan to move your TV or add new aerial runs, do it before plastering. This prevents damage to freshly plastered walls and avoids the need for additional work later.
Any structural changes, like adding or removing coving, should also be planned now aswell.
Making these decisions early saves time and prevents future issues, ensuring that your plastering work is not disrupted by unforeseen modifications.
Protect Your Space
Plastering can be a messy job. Protecting your space is essential. Start by removing all furniture and belongings from the room. If some items are too large to move, cover them with dust sheets. This includes sofas, units, and even curtain rails. Use protective coverings for your floors. Dust sheets or plastic sheeting work well.
Nearby surfaces should also be protected. Cover skirting boards, windowsills, and door frames. This prevents plaster splatters from staining or damaging them. Taking these steps keeps your space clean and minimizes post-job cleanup. Proper preparation helps maintain the integrity of your home and ensures a smoother, faster plastering process.
Step 2: Wall Preparation Process
Clear and Clean the Walls
First, remove all furniture and decorations from the room. This gives you clear access to the walls.
Next, thoroughly clean the walls before plastering because dust, dirt, and grease can prevent the plaster compound from sticking to the surface properly. We have seen some horror stories from those who have attempted to plaster greasy walls.
We recommend using some simple sugar soap or a mild detergent solution to clean the walls you want plastering. Apply with a sponge or cloth, then rinse with clean water.
Allow the walls to dry completely before moving on to the next step
Strip Old Wallpaper or Paint
If your walls currently have wallpaper, it will need to be removed, because the moisture from the plaster will losen the wallpaper underneath and cause the plaster to break and fall off once dried.
Use a wallpaper steamer and a wallpaper scraper to remove the paper.
The steam will soften the adhesive, making it much easier to scrape off the paper. Work slowly to ensure all wallpaper is removed to allow for a cleaner surface to work on, resulting in a better finish.
Any of your painted walls need to be sanded down to remove any raised points, and provide the plasterer with smooth working surface for the plaster to stick to. We recommend using a medium-grit sandpaper for this task.
After sanding, clean up the dust using a vacuum and a damp cloth.
Removing wallpaper and sanding painted walls ensures that the new plaster has a solid and even base.
This step prevents future peeling or cracking, and unnecessary expenses, which can occur if the surface beneath the plaster isn’t adequately prepared.
By taking the time to strip and sand, you ensure a longer-lasting, higher-quality finish.
Inspect and Repair Wall Surfaces
Examine your walls for any loose plaster, cracks, or holes. For any small holes, these can be filled with a standard wall filler from the likes of B&Q or Wickes.
Apply the filler with a putty knife, and smooth it out. Once applied you must allow it to dry completely before sanding it smooth. Dont rush this step.
Larger flaky areas will require more of your attention. Use a bonding agent to stabilize these areas. Apply the bonding agent according to the manufacturer’s instructions. This creates a solid base for the new plaster.
Properly repairing wall surfaces is crucial for achieving a smooth and durable finish. Neglecting this step can lead to imperfections in the plaster, such as bubbling or uneven texture. By addressing these issues beforehand, you ensure that your plastering work will be both visually appealing and structurally sound.
Power Off and Remove Fittings
Safety is very important. Therefore, before you or a professional plasterer can start plastering, switch off the power at the consumer unit (Fuse Board). This ensures you won’t accidentally get a shock.
Remove socket faceplates and light fittings. Wrap them in plastic and tape to keep them clean. This prevents plaster from getting into the fittings, which can cause issues later.
Taking the time to power off and remove fittings ensures that your plastering process is safe and efficient. It also protects your electrical components from damage, which can save you time and money on repairs.
Proper preparation of these elements helps maintain the overall quality of your home.
Apply Scrim Tape and Bonding Agents
Cracks in the walls can be problematic. Cover small cracks with scrim tape. This mesh tape helps keep the plaster intact and prevents future cracking. For larger cracks, consider consulting a professional because they can ensure your wall is structurally sound before any plastering takes place.
Controlling wall suction is essential for a good plaster finish. Apply watered-down PVA or a bonding agent to the walls. This regulates how quickly the plaster dries. If the wall absorbs moisture too quickly, the plaster can crack or peel. Advice given directly from British Gypsum – Preparing Walls for Plastering
Applying scrim tape and bonding agents ensures a strong bond between the plaster and the wall. This step helps prevent future issues, such as peeling or cracking, and contributes to a smoother, more durable finish.
Step 3: Surface-Specific Preparations
Plasterboard
Plasterboard is one of the easiest surfaces to work with. Ensure all screws are countersunk and joins are taped. Use mesh tape for the joins. This creates a seamless edge and prevents cracks.
Ensuring that plasterboard is properly prepared prevents common issues like joint cracking or uneven surfaces. This preparation step ensures that your final plaster finish is smooth and professional-looking.
Brick Walls
Brick walls require a bit more preparation. Brush the surface with a wire brush to remove loose debris. Apply a watered PVA layer or bonding agent to the bricks to crease a seal between the plasterboard glue and the bricks. This helps the plaster stick properly, and not have the moisture be sucked out of the glue or plasterboard bonding compound.
Without this step, the plaster might not stick to the high-suction surface of the brick, and proper preparation of brick walls ensures that the plaster has a strong bond.
Neglecting this step could cause future issues such as peeling or poor adhesion.
Existing Plaster
Each surface requires specific preparation steps. For existing plaster, you’ll need to ensure it’s clean and stable. We recommend you do this by remocing any existing loose plaster and apply a bonding agent such as PVA to it.
Step 4: Final Touches and FAQs
Final Cleaning and Touch-Ups
After all the prep work, give the walls a final clean. Use sugar soap to remove any remaining grease or dust. This step is crucial for the plaster to adhere properly.
Smoothing Plaster Before Painting
Once the plaster is applied, it needs to be smoothed. Lightly sand the plastered walls to achieve an even surface. This creates the perfect base for painting. Use fine-grit sandpaper and work in circular motions. Be gentle to avoid damaging the new plaster.
Smoothing the plaster ensures that your walls are perfectly prepared for painting. This step eliminates any minor imperfections, creating a flawless finish that enhances the overall appearance of your room.
Priming Plaster Before Painting
Allow the plaster to dry fully. This can take several days, depending on the conditions. Once dry, apply a diluted primer or emulsion. This seals the plaster and prepares it for painting. Use a roller for large areas and a brush for edges.
Priming the plaster before painting is essential. This step ensures that the paint adheres well and provides a durable finish. Proper priming also prevents issues like paint peeling or cracking, ensuring a long-lasting and beautiful result.
Additional Tips and Resources
Choosing the Right Plaster for Your Project
There are different types of plaster for different needs. Understanding which plaster to use can make a big difference. Gypsum plaster is common for interior walls. It sets quickly and provides a smooth finish. Lime plaster is breathable and ideal for older buildings. Cement plaster is suitable for exterior surfaces due to its durability. Consult with a professional to choose the best plaster for your project.
Choosing the right plaster ensures that your project meets your specific needs. Different types of plaster have unique properties, and selecting the right one ensures a high-quality and long-lasting finish.
Dealing with Common Plastering Issues
Even with thorough preparation, issues can arise. Here are some common problems and how to address them:
- Cracking: This often occurs due to rapid drying. Keep the room humid during drying by misting the walls with water.
- Blistering: Caused by trapped air, this can be fixed by puncturing the blisters and reapplying plaster.
- Uneven Finish: Sand the area and apply a thin layer of plaster to even it out.
Understanding and addressing common plastering issues ensures that your finished walls are smooth and professional-looking. Proper maintenance and timely repairs help maintain the integrity and appearance of your plastered surfaces.
Hiring a Professional Plasterer
While DIY plastering is possible, hiring a professional ensures the best results. Professional plasterers have the experience and tools to handle any issues that arise. They can also save you time and effort. At Get Plastered, our team is highly skilled and experienced. We handle all types of plastering projects, big or small.
Hiring a professional plasterer guarantees a high-quality finish. Professionals have the skills and knowledge to handle complex tasks, ensuring that your plastering project is completed to the highest standard.
Maintaining Your Plastered Walls
Once your walls are plastered, maintenance is key. Keep them clean and dry to prevent damage. Avoid hanging heavy items directly on plaster without proper anchors. If you notice any cracks or damage, address them promptly to prevent further issues.
Proper maintenance extends the life of your plastered walls. Regular cleaning and timely repairs ensure that your walls remain in excellent condition, preserving the beauty and functionality of your space.
FAQs
How long does plaster take to dry? Plaster typically takes 5-7 days to dry, depending on the room’s humidity and temperature. Ensure the room is well-ventilated to speed up the drying process.
Can I paint directly onto new plaster? No, you need to prime the plaster first. Use a watered-down emulsion or a specific plaster primer. This seals the plaster and prepares it for painting.
What should I do if my plaster starts to crack? Small cracks can be filled with a filler and sanded smooth. Larger cracks may indicate structural issues and should be assessed by a professional.
How do I know if my walls are properly prepared for plastering? Your walls should be clean, dry, and free from any loose material. Any cracks or holes should be repaired, and the surface should be treated with a bonding agent if necessary.
Is plastering a DIY job or should I hire a professional? While small repairs can be done DIY, large plastering jobs are best left to professionals. They have the skills and tools to ensure a smooth, durable finish.
Can I plaster over old paint? Yes, but the paint needs to be sanded to create a rough surface for the plaster to adhere to. Clean the walls thoroughly to remove any dust or grease.
What is the difference between plastering and skimming? Plastering involves applying a base coat and a finish coat to create a new surface. Skimming is applying a thin layer of plaster over an existing surface to smooth it out.
Why is PVA used before plastering? PVA helps to control the suction of the wall, preventing the plaster from drying too quickly. This ensures a better finish and reduces the risk of cracking.
How thick should plaster be applied? The thickness of the plaster depends on the surface and the type of plaster. Generally, a base coat is around 11mm thick, and a finish coat is around 2mm thick.
Can I plaster over damp walls? No, plastering over damp walls can cause the plaster to fail. Address any damp issues before starting your plastering project.
Conclusion
Proper preparation is essential for successful plastering. It ensures a smooth, durable finish that will last for years. At Get Plastered, we pride ourselves on our meticulous preparation and high-quality plastering services. With over 15 years of experience, we are the go-to plasterers in South Devon. Whether you need plastering for a new build, a renovation, or just a small repair, we are here to help. Contact us today to discuss your plastering needs and get a free quote. Your satisfaction is our top priority.
