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Can External Wall Rendering be Repaired? 

Updated: Feb 27, 2023

Reviving Your Property's Exterior: Repairing External Render

External renders are popular building materials used to enhance the look and durability of a building's exterior. They provide a smooth and even surface that can be painted or finished in various ways, giving properties a unique and attractive appearance. But over time, exposure to the elements and other factors can cause the external render to crack, chip, or deteriorate, raising the question: can the external wall rendering be repaired?

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1. What Causes Damage to External Render?

External render is exposed to various elements that can cause damage over time. These include:


Rainwater can cause damage to external render by eroding the surface and causing it to crack or flake off.

UV Rays

Prolonged exposure to UV rays from the sun can cause discolouration and fading of the render.

Temperature Extremes

Extreme temperatures can cause the render to expand and contract, leading to cracking or flaking off the surface.

Dirt & Debris

Dirt and debris, such as leaves or twigs, can accumulate on the surface of the render, leading to discolouration or staining.

• Mould & Mildew

Mould and mildew can grow on damp surfaces, leading to discolouration or staining of the render.

2. Is External Wall Rendering Repair Possible?

The answer is yes, external render can be repaired, but the extent of the repair will depend on the severity of the damage. Small cracks and chips can be filled with a matching render material and sanded down to create a seamless surface.

For more significant damage, such as large cracks or holes, the affected area will need to be removed and replaced with a new render layer. This process can be time-consuming and labour-intensive and requires specialist knowledge and experience, but it will ensure that the building's exterior is restored to its original condition.

3. The Importance of External Wall Rendering Repair.

External wall rendering repair is integral to building maintenance and should not be overlooked. It is crucial for several reasons:

  • Protects the building structure.

Render acts as a barrier, protecting the building structure from moisture and weather damage. Repairing any damage to the render will help to prevent further damage to the building.

  • Maintains curb appeal.

A well-maintained building with a smooth and attractive exterior is more appealing to potential buyers or renters. A damaged or poorly maintained exterior can detract from the value and appearance of a building.

  • Prevents further damage.

If left unrepaired, damaged render can lead to more severe problems, such as mould, rot, or structural damage. Repairing the render as soon as possible can help to prevent these problems from developing.

  • Increases energy efficiency.

External wall render helps insulate the building, keeping it warm in winter and summer. A well-maintained and adequately repaired render can help to improve the energy efficiency of the building, reducing heating and cooling costs.

  • Prevents safety hazards.

Cracked or crumbling render can pose a safety hazard, mainly if it falls off and causes injury. Repairing the render can help to prevent these safety hazards from occurring.

4. External Wall Rendering Process. What to expect.

The best way to repair external render depends on the extent of damage caused by weathering or other external factors. In most cases, minor repairs such as filling cracks or replacing small sections of damaged render are relatively straightforward and do not require specialist knowledge or tools. However, more extensive repairs, such as replacing large areas of damaged render, may need expert knowledge and tools to be carried out effectively and safely.

In these cases, it is advisable to seek professional advice from a qualified builder who can advise you on how best to proceed with your repair project.

External wall render repair experts usually follow a proven process to ensure a successful outcome. Below you can see what to expect when involving these professionals.

1. General Preparation.

Before repairing the render, the wall's surface must be cleaned, and any loose or damaged material must be removed. If the damage to the render was caused by underlying structural issues, such as cracks or holes in the wall, these must be repaired before the render can be applied. If the wall is damp or has evidence of moisture damage, this must be addressed before the repair can be carried out.

2. Surface Preparation.

By thoroughly preparing the surface before repairing the render, you will ensure that the repair will be strong, durable, and long-lasting. Shortcuts taken during the preparation stage can lead to a subpar repair that will not hold up over time. The surface must be level and free from debris. If necessary, apply a bonding agent to the surface to improve adhesion.

3. Mixing the Render.

Render mixing must be done according to the manufacturer's instructions, ensuring consistency. It is essential to use a render that matches the existing finish as closely as possible.

4. Applying the Render.

Render application to the damaged area is usually done by working in small sections and ensuring that the render is evenly spread.

5. Smoothing the surface.

The newly applied render surface needs to be smooth, even and free from air pockets.

6. Drying.

The render needs to dry completely before painting or applying a finish. Depending on the weather conditions and the render material used, this can take several hours or overnight.

7. Finishing.

Once the render is dry, it can be painted or finished as desired. If the repair was extensive, it might be necessary to paint the entire wall to achieve a consistent look.

5. Summary.

In conclusion, external render can be repaired, but the extent of the repair will depend on the severity of the damage. When repairing external render, it is essential to use the right tools and materials, prepare the surface, and, if necessary, remove and replace the entire exterior surface. This will ensure that the building's exterior is restored to its original condition and provides long-lasting protection and durability.

A professional external wall rendering repair company like Veramut Ltd can offer several benefits, including expertise, quality workmanship, time and cost savings, guaranteed compliance with regulations, and peace of mind. It is always best to use a professional renderer for any repair work to ensure that the repair is done correctly and to the highest standard.

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