Issues That May Arise During Wall Rendering

Rendering is a process of applying a blend of cement and other materials to the exterior walls of a building to provide structural stability and protection from the elements. It can also improve visual aesthetic, increasing property value.

Unfortunately, wall rendering may sometimes lead to issues due to improper application or inaccurate materials selection. This article will discuss some of these possible issues that could arise when carrying out wall rendering projects.


contractor preparing the wall surface for rendering

Poorly Mixed Render Mixtures

One common issue that can occur during wall rendering involves the use of improperly mixed render mixtures or incorrect material selections. Without the proper mixture ratio, it’s impossible for the render to achieve its intended strength and protective properties. In order for the render to retain its strength, it must contain the following components:

  • Sand
  • Cement
  • Water
  • Pigment (to shade the render to a desired colour)

If any one of these components is left out or not mixed properly, the render may be weaker than intended and can create cracks or peeling. Furthermore, selecting the wrong type of sand for your project (such as soft sand instead of sharp sand) can also lead to problems during application.

It’s important to consult with an experienced renderer before starting your wall rendering project in order to ensure that you have selected the correct materials and have accurately measured out their respective ratios.


Insufficient Surface Preparation

Another common issue that can arise during wall rendering is insufficient surface preparation. Before applying a render, the wall must be prepared accordingly. This means ensuring that any existing paint is removed and any cracks or uneven surfaces are filled and smoothed down.

If proper preparation is not done prior to rendering, the finish will come out looking lumpy and uneven, with potential for more cracks or areas of peeling to appear down the line.


Moisture Issues

Moisture problems can also cause issues in rendered walls. During application, moisture should never exceed 5%-6% as this could create pores in the finished material which allow water/moisture to enter through them, causing delamination of the material from the wall.

Furthermore, condensation can arise inside the wall if there is insufficient ventilation, which may cause dampness and mold growth. It’s important to make sure that your walls are properly ventilated in order to prevent any moisture-related issues during rendering projects.


Exposure Issues

Finally, exposure to extreme weather conditions can also create problems with rendered surfaces. If a render is exposed to direct sunlight for long periods of time without adequate protection, it could result in fading or discolouration of the material over time.

It is important to take into account weather patterns when selecting a render colour scheme so that you avoid this problem altogether. Additionally, be sure to apply protective coatings on top of the render to reduce the effects of exposure to wind and rain.



In conclusion, wall rendering can be a great way to improve the look and protective properties of your property’s exterior walls, but it is important to be aware of possible issues that may arise during the process.

By taking proper precautions such as selecting the right materials, preparing the surface accordingly, avoiding water/moisture problems, and protecting the finish from extreme weather conditions you can minimize or even eliminate potential issues during wall rendering projects.


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