Painting a rendered wall is more than just applying paint – it takes preparation, skill and the right materials to achieve a professional finish. Start by cleaning the wall, repairing any cracks and applying the right primer. Choosing the right paint and mixing it properly will give the wall even coverage and enhance its texture. Applying paint carefully, covering every nook and cranny, and finishing with attention to detail can make a big difference in the final look.
Rendered walls add depth, texture and character to any space, but unpainted concrete may not suit every style. Unlike regular walls, rendered surfaces require additional preparation, but following the right steps makes the process easier. With the right techniques and planning, even a beginner can achieve great results.
Whether it’s for an interior feature wall or an exterior surface, painting a rendered wall properly enhances its appearance, adds vibrancy, and makes the finish last longer, giving your space a polished and professional touch.
What Is Render?
Render is a mixture of cement, sand, and other additives that is applied to walls to achieve a smooth or textured surface. It primarily acts as a protective and decorative layer, improving both the appearance and durability of walls. There are different types of render designed for different purposes, allowing homeowners and builders to choose the best option based on the specific needs of their projects.
Why Do We Use Render?
Weather protection: One of the main reasons for using render is to protect buildings from harsh weather conditions. It creates a shield against rain, wind, and snow, keeping the interior structure dry and safe.
- Visual appeal: Render can greatly improve the appearance of walls. It offers multiple textures and finishes, helping homeowners create the style they want, whether it’s modern or classic.
- Wall breathability: Some renders, such as lime renders, allow walls to breathe, preventing moisture buildup and reducing the chance of mold or mildew.
- Strength and durability: Render adds an extra layer of protection, making walls more resistant to cracks, wear and tear, and damage caused by moisture, pests, and other environmental factors.
- Easy maintenance: Modern renders, especially silicone-based ones, require less maintenance than traditional materials, making them a practical choice for property owners.
- Energy efficiency: Some types of render increase the thermal performance of a building, which helps maintain comfortable indoor temperatures and supports energy savings.
Types of Render
- Acrylic Render: A more adaptable option that includes acrylic polymers. It reduces the risk of cracking and works well for older buildings. Acrylic render adheres strongly to a variety of surfaces and generally dries faster than traditional cement-based renders.
- Lime Render: Typically chosen for historic or older structures because it allows the walls to “breathe,” which helps control moisture levels. Its impermeability and natural antibacterial properties make it ideal for areas with high humidity or wet conditions.
- Cement Render: A classic option made from cement, sand, and water. It is very durable and weather-resistant, making it suitable for a variety of architectural designs. However, if not applied properly, cement-rendered walls can crack over time.
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Step-by-Step Guide to Painting a Rendered Wall
Step 1: Wall preparation
Proper wall preparation is the key to a long-lasting, paintable finish. Follow these steps for best results:
1. Clean the surface
- Start by using a stiff brush or pressure washer to remove dust, dirt and loose debris. This step is important to ensure the paint adheres properly.
- For moss or mold: If you see any moss or mold, apply a fungicide solution available from hardware stores and allow it to dry completely to prevent regrowth.
- Corners and edges: Pay attention to corners and edges where dirt often collects.
2. Inspection and repairs
- Check for cracks or holes in the render. Correcting these defects creates a smoother surface for painting.
- Use exterior-grade filler to repair damaged areas. Once it dries, sand it until it is smooth.
3. Apply a stabilizing solution
- If the render looks powdery or too porous, apply a stabilizing primer. This step prepares the surface and improves paint adhesion.
- You can find the appropriate stabilizing solution at your local paint or hardware store.
Step 2: Priming the Rendered Surface
Priming is essential for a smooth, long-lasting finish.
1. Choosing the Right Primer
- Choose an exterior primer made for masonry surfaces.
- Products like Zinser Bullseye 1-2-3 work well for standard render, while silicone-based primers are best suited for silicone render.
2. Application Tips
- Use a long-pile roller for textured areas and a brush for corners and edges to achieve full coverage.
- Follow the manufacturer’s recommended drying time – typically around 6 hours at 20°C.
- The Australian Standards Guide to Paint Application is a helpful reference for best practice.
Step 3: Choosing the right paint
Choosing the right paint affects both the appearance and longevity of your work.
1. Types of masonry paint
- High-quality masonry paints are designed for outdoor use. Silicone-based paints are breathable and water-resistant, providing durable protection.
- Acrylic paints are budget-friendly, although they may require more frequent maintenance.
2. Colour and finish
Choose colours that match the style of your home. Smooth finishes give a modern look, while textured paint can hide minor imperfections.
Step 4: Apply Paint
Now it’s time to paint! Follow these steps for a professional finish:
1. First Coat:
For new render, thin the first coat with about 10% water to improve absorption. Use a long-pile roller for large areas and a brush for edges and details.
2. Technique:
Apply paint in a “W” or “M” pattern. This method avoids streaks and ensures that overlapping strokes maintain a wet edge.
3. Second Coat:
After the first coat has dried, apply a second coat undiluted for full coverage. Painting in shaded areas helps prevent uneven drying.
Step 5: Finishing Touches
Final steps help create a polished look:
1. Check for imperfections:
Check for missed areas, drips, or uneven spots after the surface has dried. Use a small brush for touch-ups.
2. Apply a protective sealant:
Consider a clear masonry sealant to increase durability, especially if your walls are exposed to harsh weather.
Step 6: Cleaning and Maintenance
Proper cleaning extends the life of your tools and keeps your walls looking fresh:
1. Clean your tools:
Depending on the type of paint, rinse brushes and rollers. Water-based paints require water; oil-based paints require paint thinner.
2. Dispose of waste responsibly:
Take empty paint cans to a recycling center and follow local disposal regulations. Planet Ark provides more guidance on responsible recycling practices.
Conclusion
Painting a rendered wall may seem daunting, but with the right approach and preparation, it can be a lot easier. By following these steps: preparing the wall, applying primer, choosing paint, mixing it properly, applying paint, and adding finishing touches, your rendered wall will quickly look fresh and brand new. It’s important to remember that proper cleaning after completing the project ensures that your efforts will last a long time. With careful planning and attention to detail, anyone can confidently “paint a rendered wall.”
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