5 Useful Tips for Quality Rendering of a Cement Block Wall

Posted by on Apr 1, 2015 in Uncategorized

Just like many other types of construction-related processes, the quality of cement rendering is widely varied depending on individual levels of skill and experience. Therefore, failure of render is not something new in the industry.

In the same line, a number of factors can result in poor-quality cement rendering including bad workmanship, use of poor-quality materials, and inappropriate working techniques. If you wish to avoid flaws and increase the general quality of render for a cement block wall, here are a number of important tips that you should follow:

Tip 1: Remove Background Coat Properly

When you are preparing the surface for render, gently remove paint, plaster, laitance or any other coating since they may contain soluble salts that may crystallize and, thus, inhibit proper adhesion. Without proper adhesion, the applied coats will not mix well and the render will eventually tear down.

Tip 2: Ensure Uniform Suction

Rendering failures will take place if suction of the background is uneven. The unlevelled background will absorb plenty of water from the render, thus, compromising its structural integrity. To avoid this situation, the holes and depressions in the background should be ought to be filled properly prior to the application of the undercoat. So as to provide an even suction over the wall area that is to be rendered, it is essential to wet the background.

Tip 3: Apply At Least Three Coats

The number of coats that you apply for the render has a significant impact on its strength. In essence, the coatings that are in-between the under-coating and finishing-coating ought to bond well not only between themselves but also with the background. That will help to prevent large cracks from forming on the surface of the walls when thermal expansion occurs. Remember to let each coat dry and suction properly before you can put in the next coat. 

Tip 4: Don’t Let the Render Dry Out Rapidly

Typically, small surface cracks are seen when the render dries out too fast. Even though dampening the walls and protecting them from the heat of the sun can help to rapid drying, making control joints is a better way to limit cracking in the rendered surfaces. These joints will help to keep the render intact even when it has dried out.

Tip 5: Use Materials of Standard Quality

Very often, cheaply-acquired rendering materials such as cement, sand, lime, and adhesives result in poor performance. When purchasing any materials needed to render your wall, always stick to manufacturer’s specifications and instructions.  

Most importantly, you can always approach a professional building contractor (such as Texture Coating Qld Pty Ltd) to help with your cement rendering requirements. This will ensure that your project is monitored and inspected at every stage of the cement rendering process.  

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