Different Methods of Repairing Cracks in Rendered Walls

Rendered walls are an attractive, practical and durable feature of many homes. Unfortunately, even the best built rendered walls can become cracked over time due to settling or extreme weather conditions. When cracks appear in a rendered wall it’s important to repair them quickly, as they can weaken the wall’s structure and cause further damage if left unchecked.

Fortunately, there are several different methods for repairing cracks in rendered walls. The ideal option will depend on the size of the crack and the type of render used on the wall. In this article we’ll discuss some of the most common methods for repairing cracks in rendered walls so you can choose one that is suitable for your situation.

repairing rendered walls

Method 1: Minor Crack Repairs

Minor cracks can usually be repaired with a simple mortar powder and water mixture. This is particularly useful for small hairline cracks that are barely visible to the naked eye. Simply mix enough mortar powder with water until it forms a thick paste and then apply it directly into the crack. Use a putty knife or other tool to spread the mixture evenly across the crack before allowing it to dry completely.


Method 2: Medium Crack Repairs

Medium sized cracks may require more substantial repairs. In this case, you’ll need to remove any loose material from around the edges of the crack using a chisel and hammer. Once all of the loose pieces have been removed, fill in the gap with an epoxy-based filler material. This material is designed to be stronger and more durable than the mortar powder mixture used for minor repairs, making it ideal for fixing medium-sized cracks.


Method 3: Major Crack Repairs

If you’re dealing with a major crack in the rendered wall, then the best option is to re-render the affected area. This process will involve removing any loose material from around the edges of the crack before applying a new layer of render over top. You’ll also need to use mesh or reinforcing bars across larger cracks in order to ensure that they don’t spread in future. Once finished, allow the new render to dry completely before painting or adding any other decorative elements.



Cracks in rendered walls can be a nuisance, but fortunately they are usually easy to repair. The ideal method for repairing cracks in rendered walls will depend on the size and type of render used, but minor cracks can often be patched up with a simple mortar powder mixture while more substantial repairs may require re-rendering the affected area. By following these steps you should be able to keep your rendered walls looking their best for years to come.

If you have any questions or need additional help with repairs, it is always recommended that you contact a qualified professional to ensure that any repair work is done correctly and safely.


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