Guide: The Step-by-Step Process of Wall Rendering
Wall rendering is a great way to improve a building’s appearance while also protecting it from weather conditions. A properly done render not only enhances the aesthetic of the walls but also increases the building’s durability and insulation. For those who want to learn more about the rendering process, we’ve prepared this step-by-step guide.
Step 1: Assessing the Wall Surface
The first step in the rendering process is a thorough assessment of the wall surface condition. It’s important to check if the existing plaster is stable, if there are any damages, cracks, loose bricks, or other issues that might affect the adherence of the new render.
- Surface repairs – If there are any gaps or cracks in the walls, they should be repaired before rendering begins. A clean and stable surface is essential for a long-lasting result.
Step 2: Preparing the Walls
Once the surface has been assessed and repaired, it’s time to prepare the walls for the application of the render. This crucial step ensures good adhesion and durability of the render layer.
- Cleaning the walls – All dirt, dust, grease, and peeling coatings must be removed. A clean surface ensures better adhesion for the render.
- Applying a primer – To improve adhesion and minimize the absorbency of the substrate, it’s advisable to use a primer. The primer ensures even drying of the render and prevents future peeling.
Step 3: Choosing the Rendering Materials
Selecting the right materials is key to the quality and durability of the render. Several types of render are available on the market, each with different properties and appearance.
- Cement-lime render – This is a traditional material that offers excellent weather resistance and is relatively easy to apply.
- Silicone render – Popular for its hydrophobic properties, which protect against water and dirt.
- Acrylic render – Often chosen for its wide range of colors and flexibility, which helps prevent cracking.
Step 4: Applying the First Layer of Render (Base Coat)
After preparing the surface and choosing the materials, it’s time to apply the first layer of render, known as the base coat. This layer levels the surface and enhances the adhesion of the following layers.
- Manual or machine application – Render can be applied manually using a trowel or mechanically, which is a faster option for large surfaces.
- Layer thickness – It’s important to maintain the correct thickness for the first layer, usually between 8 and 12 mm, depending on the type of render.
Step 5: Reinforcement with Mesh
In some cases, especially where walls are subject to high stress or cracking, reinforcing mesh is recommended. The mesh strengthens the render and prevents future cracking.
- Using reinforcement mesh – The mesh is embedded in the freshly applied base coat, adding strength to the structure and preventing future cracks.
Step 6: Applying the Second Layer of Render (Finishing Coat)
After applying the base coat and reinforcing it with mesh, it’s time to apply the second layer, which serves as the finishing coat. This layer gives the wall its final appearance, so it must be applied with care.
- Even application – It’s important that the second layer is spread evenly without visible joints. The thickness of the finishing coat is usually between 4 and 6 mm.
- Texture and finish – Depending on preference, the second layer can be smooth or textured, with various finishes such as troweled, rough, or mimicking natural materials.
Step 7: Finishing and Curing
The final step is curing the freshly applied render to ensure its durability and resistance to weather conditions. Proper curing is essential to achieving long-lasting results.
- Drying – Avoid exposing the fresh render to direct sunlight or rain. Render usually takes a few days to dry fully, depending on the weather conditions.
- Painting (optional) – If the chosen render doesn’t contain a color pigment, exterior paint can be applied after it dries to give the walls their final color.
Wall rendering is a process that requires precision and proper preparation, but the results can significantly enhance the appearance and functionality of a building. With the right surface preparation, material choice, and careful application, walls will not only look beautiful but also be resistant to external factors for many years.