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Case Study – Render onto Knauf Aquapanel

At EWI Pro, we specify many projects throughout the UK. They vary in size, scope, and system application. From large-scale commercial projects to small-scale residential, we cover every type of project. As we’ve discussed recently, we provide a comprehensive range of testing processes. These include wind-load tests, moisture testing, and pull-out tests. Our Technical Team also provides expert U-value calculations to ensure the system is suitable. In our new series of blogs, we will shine a light on specific projects and the build-ups they utilise. Our next project is a shining example of the use of Knauf Aquapanel; the system holds a prestigious BBA Certificate.

Project details

– Substrate: Knauf Aquapanel onto brick
– Basecoat: EWI-225 Premium Basecoat
– Topcoat: EWI-075 Silicone Render – 1.5mm grain size
– Colour: RAL1002
– Location: Witney
– Installer:

The build-up – Render onto Knauf Aquapanel

The Knauf Aquapanel and silicone render system is an exceptional combination for residential properties, providing durability, weather resistance, and aesthetic appeal.

Build-Up Process

  1. Preparation: Before the installation begins, ensure the surface is clean, dry, and free from any substances that might impair adhesion.
  2. Installation of Knauf Aquapanel: Knauf Aquapanel is a cement-based material which can be fixed directly onto a suitable frame (for example, wooden or metal studs) using either screws or nails. It can also be installed on a masonry substrate. Panels should be installed in a staggered pattern, with joints not aligning with the stud’s centre. Each panel should be firmly secured, and there should be no gaps between the boards.
  3. Jointing: After the Aquapanel has been installed, joints between panels should be filled with an appropriate Knauf Aquapanel Joint filler and tape.
  4. Rendering: Once the joint filler has been set, a suitable primer is applied over the Aquapanel. After this, a base coat render is applied using a stainless steel trowel, often reinforced with a fibreglass mesh for added strength. The surface is then primed again in preparation for the silicone render.
  5. Silicone Render Application: A thin layer of silicone render is applied over the prepared surface. This is smoothed out to ensure a flat and even finish. The render is then left to cure, a process which can take a few days.


  1. Durability: Knauf Aquapanel is extremely resistant to wear and tear, offering a longer lifespan compared to traditional plasterboard. It’s also resistant to mould and mildew, providing a healthy living environment.
  2. Water and Weather Resistance: Aquapanel is a cement-based product, making it extremely water and weather resistant. This makes it ideal for use in areas exposed to high levels of moisture. Coupled with silicone render, which also has excellent water-repellent properties, the system provides robust protection against harsh weather conditions.
  3. Flexibility: Silicone render is flexible and less prone to cracking compared to traditional renders. This means it can withstand slight movements in the building structure without damage.
  4. Aesthetics: Silicone render comes in a variety of colours and finishes, allowing homeowners to achieve their desired aesthetic. The render is also self-cleaning, meaning it will maintain its appearance over time.
  5. Thermal Performance: Both Knauf Aquapanel and silicone render have good insulating properties. When used together, they can help improve the property’s overall thermal performance, leading to potential energy savings.
  6. Ease of Installation: The Knauf Aquapanel is lightweight and easy to cut, which can simplify and speed up the installation process. Silicone render is also typically easier to apply than traditional renders.

Overall, the combination of Knauf Aquapanel and silicone render offers a reliable and attractive finish for residential properties. While providing enhanced protection against the elements, it also improves the building’s thermal performance and aesthetic appeal.


Crucially, the system holds a coveted BBA Certificate. The BBA examined several vital factors to ratify the system’s suitability. It can adequately resist the wind loads and impact damage likely to be met in service; possesses a reaction to fire classification of A2-s1, d0; tends to shed water and will considerably reduce the amount of water penetrating through the substrate; and will have a service life over 30 years.

The British Board of Agrément (BBA) is the UK’s major authority offering approval and certification services to manufacturers and installers supplying the construction industry. Its primary mission is to provide assurance of the fitness-for-purpose of new and innovative products and systems.

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