External rendering is an essential aspect of building construction, which provides protection and insulation against external elements. However, improper external rendering can severely damage the building structure, reducing its longevity and value.
Here are the five most common mistakes in external rendering in Surrey that you must avoid.
1. Lack of Proper Surface Preparation
One of the most common mistakes in external rendering is the lack of proper surface preparation. Failing to clean the wall’s surface before rendering, can result in poor adhesion and uneven finishes. The surface of the wall should be cleaned, levelled, and made ready for rendering. Any loose materials or debris should be removed, and any cracks or holes should be repaired.
2. Using the Wrong Type of Render
Another common mistake is using the wrong type of render. Different types of renders are available, such as lime render, acrylic render, and cement render. The type of render used should be appropriate for the climate and environmental conditions. For example, the lime render is suitable for areas with high humidity, while the acrylic render is ideal for areas with heavy rainfall.
3. Inadequate Thickness of Render
The thickness of the external render should be adequate to provide sufficient protection and insulation to the building structure. The minimum thickness for the render should be at least 15 mm, and the maximum thickness should not exceed 25 mm. Inadequate thickness of render can lead to cracks and uneven finishes, which can result in water penetration and structural damage.
4. Poor Mixing and Application
The mixing and application of the render should be made correctly to ensure the render sets properly and adheres to the wall surface. Poor mixing can lead to inconsistent colour and texture, while the poor application can lead to bubbles and uneven finishes. The right ratio of water and render should be used, and the render should be applied evenly and at the right thickness.
5. Ignoring Expansion Joints
Expansion joints are essential in external rendering to accommodate the movement and expansion of the building structure due to changes in temperature, humidity, and other environmental factors. Failure to install expansion joints can result in cracks, leading to water penetration and structural damage. The expansion joints should be installed at the right intervals, and the render should be cut and sealed around the expansion joints.
Avoiding these mistakes will ensure a durable and long-lasting external render. When you work with the experts of Parson Ash Limited, you can easily avoid such costly mistakes during external rendering in Surrey.